ORCID Profile
0000-0001-9607-6621
Current Organisation
UNSW Canberra @ ADFA
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Optical Physics | Nanotechnology | Nonlinear Optics and Spectroscopy | Photonics and Electro-Optical Engineering (excl. Communications) | Optical Technology | Nanophotonics | Photonics, Optoelectronics and Optical Communications | Optometry and Ophthalmology | Functional Materials | Optical Properties of Materials | Optical And Photonic Systems | Electrostatics And Electrodynamics | Soft Condensed Matter | Nanoscale Characterisation | Optics And Opto-Electronic Physics | Nanoelectromechanical Systems | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Technological and Organisational Innovation | Automotive Equipment | Network switching equipment | Network transmission equipment | Physical sciences | Expanding Knowledge in Technology |
Related Links
Publications
All-dielectric optical nanoantennas
Publisher: IEEE
Date: 07-2015
All-Dielectric Nanophotonic Structures: Exploring the Magnetic Component of Light
Publisher: Springer International Publishing
Date: 2017
Optically resonant dielectric nanostructures
Publisher: American Association for the Advancement of Science (AAAS)
Date: 18-11-2016
Abstract: The resonant modes of plasmonic nanoparticle structures made of gold or silver endow them with an ability to manipulate light at the nanoscale. However, owing to the high light losses caused by metals at optical wavelengths, only a small fraction of plasmonics applications have been realized. Kuznetsov et al. review how high-index dielectric nanoparticles can offer a substitute for these metals, providing a highly flexible and low-loss route to the manipulation of light at the nanoscale. Science , this issue p. 10.1126/science.aag2472
Observation of anapole with dielectric nanoparticles
Publisher: IEEE
Date: 09-2016
Two tractable models of dynamic light scattering and their application to Fano resonances
Publisher: Walter de Gruyter GmbH
Date: 18-10-2021
Abstract: We introduce two tractable analytical models to describe dynamic effects at resonant light scattering by subwavelength particles. One of them is based on a generalization of the temporal coupled-mode theory, and the other employs the normal mode approach. We show that sharp variations in the envelope of the incident pulse may initiate unusual, counterintuitive dynamics of the scattering associated with interference of modes with fast and slow relaxation. To exhibit the power of the models, we apply them to explain the dynamic light scattering of a square-envelope pulse by an infinite circular cylinder made of GaP, when the pulse carrier frequency lies in the vicinity of the destructive interference at the Fano resonances. We observe and explain intensive sharp spikes in scattering cross-sections just behind the leading and trailing edges of the incident pulse. The latter occurs when the incident pulse is over and is explained by the electromagnetic energy released in the particle at the previous scattering stages. The accuracy of the models is checked against their comparison with results of the direct numerical integration of the complete set of Maxwell’s equations and occurs very high. The models’ advantages and disadvantages are revealed, and the ways to apply them to other types of dynamic resonant scattering are discussed.
Edge States and Topological Phase Transitions in Chains of Dielectric Nanoparticles
Publisher: Wiley
Date: 12-01-2017
Abstract: Recently introduced field of topological photonics aims to explore the concepts of topological insulators for novel phenomena in optics. Here polymeric chains of subwavelength silicon nanodisks are studied and it is demonstrated that these chains can support two types of topological edge modes based on magnetic and electric Mie resonances, and their topological properties are fully dictated by the spatial arrangement of the nanoparticles in the chain. It is observed experimentally and described how theoretically topological phase transitions at the nanoscale define a change from trivial to nontrivial topological states when the edge mode is excited.
Broadband Achromatic Metalens in Mid‐Wavelength Infrared
Publisher: Wiley
Date: 09-07-2021
Abstract: Metasurface provides a powerful platform to correct the chromatic aberration of conventional lenses in a flexible, integratable, and ultra‐compact manner. Mid‐wavelength infrared has promised many exciting applications ranged from molecular fingerprint detection to low‐light‐level night vision. Developing broadband achromatic metalens in mid‐wavelength infrared becomes necessary to meet the increasingly urgent demands on high performance photonic devices. Here, we demonstrate the broadband achromatic metalenses from 3.5 to 5 µm with all‐silicon metasurfaces. Large phase dispersion control range is achieved to realize metalenses with both large numerical apertures and s le sizes while maintaining high focusing efficiency. The experimental results verify the diffraction‐limited achromatic focusing and imaging of the metalenses in mid‐wavelength infrared. Additionally, we also demonstrate the versatility by successfully implementing the generation of the broadband achromatic focusing optical vortex ( L = 2). This work represents a solid step toward practical implementation of metalens and may find applications in mid‐wavelength infrared imaging and detections.
Constraint polynomial approach: an alternative to the functional Bethe Ansatz method?
Publisher: Springer Science and Business Media LLC
Date: 2020
Polarization-independent Fano resonances in arrays of core-shell nanoparticles
Publisher: American Physical Society (APS)
Date: 13-08-2012
Light Scattering by a Finite Obstacle and Fano Resonances
Publisher: American Physical Society (APS)
Date: 30-01-2008
Magnetic light and all-dielectric nanophotonics
Publisher: IEEE
Date: 07-2014
Incommensurate dynamics of resonant breathers in Josephson junction ladders
Publisher: American Physical Society (APS)
Date: 02-05-2002
Ultra-Broadband Directional Scattering by Colloidally Lithographed High-Index Mie Resonant Oligomers and Their Energy-Harvesting Applications
Publisher: American Chemical Society (ACS)
Date: 23-04-2018
Abstract: Emerging high-index all-dielectric nanostructures, capable of manipulating light on the subwavelength scale, empower designing and implementing novel antireflection and light-trapping layers in many photonic and optoelectronic devices. However, their performance and practicality are compromised by relatively narrow bandwidths and highly sophisticated fabrications. In this paper, we demonstrate an ultra-broadband (300-1200 nm) directional light scattering strategy using high-index surface silicon oligomer resonators fabricated by a facile, scalable, and low-cost colloidal lithography technique. The exceptional broadband forward scattering stems from a combined effect of strongly intercoupled Mie resonances within the oligomers composed of randomly positioned nanodisks in the visible region and a strong electric mode coupling between the oligomers and the high-index substrate in the red-to-near-infrared region. By implementing this efficient approach in silicon solar cells, the integrated optical reflection loss across the wavelength range 300-1200 nm can be as low as 7%. Consequently, the short-circuit current density determined from the external quantum efficiency of solar cells can be increased to 35.1 from 25.1 mA/cm
Synthesizing multi-dimensional excitation dynamics and localization transition in one-dimensional lattices
Publisher: Springer Science and Business Media LLC
Date: 16-12-2020
Multifaceted anapole: from physics to applications [Invited]
Publisher: Optica Publishing Group
Date: 06-04-2022
DOI: 10.1364/OME.456070
Abstract: The optical anapole state resulting from interference of the electric and toroidal moments is of much interest due to its nonradiating nature. Interference of optical modes supported by a erse range of Mie-resonant structures has found many applications, such as in biosensors and optical communication. This review provides an overview of the recent progress of anapole states in photonics. After a brief historical background, a complete mathematical description is presented. It allows one to clearly demonstrate and identify the existence of anapole states and highlight their fundamental properties. Then, we focus on the excitation of anapoles in photonics and discuss the relation to other states, such as bound states in the continuum. Finally, we discuss a series of advances that uncover the anapole potential in various applications, from nonlinear photonics and lasing to optical communication and sensing.
Optically isotropic responses induced by discrete rotational symmetry of nanoparticle clusters
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR01291C
Abstract: Fostered by the recent progress of the fields of plasmonics and metamaterials, the seminal topic of light scattering by clusters of nanoparticles is attracting enormous renewed interest gaining more attention than ever before. Related studies have not only found various new applications in different branches of physics and chemistry, but also spread rapidly into other fields such as biology and medicine. Despite the significant achievements, there still exists unsolved but vitally important challenges of how to obtain robust polarisation-invariant responses of different types of scattering systems. In this paper, we demonstrate polarisation-independent responses of any scattering system with a rotational symmetry with respect to an axis parallel to the propagation direction of the incident wave. We demonstrate that the optical responses such as extinction, scattering, and absorption, can be made independent of the polarisation of the incident wave for all wavelengths. Such polarisation-independent responses are proven to be a robust and generic feature that is purely due to the rotational symmetry of the whole structure. We anticipate our finding will play a significant role in various applications involving light scattering such as sensing, nanoantennas, optical switches, and photovoltaic devices.
High-efficiency beam deflection of visible light based on dielectric metasurfaces
Publisher: OSA
Date: 2018
Nanoparticle-based metasurfaces for angular independent spectral filtering applications
Publisher: AIP Publishing
Date: 02-12-2019
DOI: 10.1063/1.5108578
Abstract: We designed a metasurface made of a monolayer of spherical nanoparticles embedded in a dielectric slab, which exhibits transmission properties independent of the incidence angle. Adjusting the electromagnetic coupling between high-index dielectric and hybrid core-shell nanoparticles enables the metasurface to operate in low-pass, bandpass, as well as band-stop regimes in the visible and near-infrared spectral ranges. We demonstrate how symmetric properties of spherical nanoparticles determine the response of the metasurface, resulting in a spectral filter with a wide angular acceptance range. We study transmission characteristics of the metasurface, such as frequency selectivity, the slope of filtering at cutoff frequencies, and the robustness of the metasurface against experimental variations in geometrical parameters. Our analyses show that the proposed approach can be used to design angular-independent spectral filters with the same material platform and approach to operate in different regimes and spectral ranges.
Tunable Yagi-Uda-type plasmonic nanoantennas: Implications for nanoscale optical sensing
Publisher: SPIE
Date: 31-01-2012
DOI: 10.1117/12.914221
Reversible Image Contrast Manipulation with Thermally Tunable Dielectric Metasurfaces.
Publisher: Wiley
Date: 05-03-2019
Abstract: Increasing demand for higher resolution of miniaturized displays requires techniques achieving high contrast tunability of the images. Employing metasurfaces for image contrast manipulation is a new and rapidly growing field of research aiming to address this need. Here, a new technique to achieve image tuning in a reversible fashion is demonstrated by dielectric metasurfaces composed of subwavelength resonators. It is demonstrated that by controlling the temperature of a metasurface the encoded transmission pattern can be tuned. To this end, two sets of nanoresonators composed of nonconcentric silicon disks with a hole that exhibit spectrally sharp Fano resonances and forming a Yin-Yang pattern are designed and fabricated. Through exploitation of the thermo-optical properties of silicon, full control of the contrast of the Yin-Yang image is demonstrated by altering the metasurface temperature by ΔT ≈ 100 °C. This is the first demonstrated technique to control an image contrast by temperature. Importantly, the turning technique does not require manipulating the external stimulus, such as polarization or angle of the illumination and/or the refractive index of this environment. These results open many opportunities for transparent displays, optical switches, and tunable illumination systems.
Forward and Backward Switching of Nonlinear Unidirectional Emission from GaAs Nanoantennas.
Publisher: American Chemical Society (ACS)
Date: 26-12-2020
Abstract: High-index III-V semiconductor nanoantennas have gained great attention for enhanced nonlinear light-matter interactions, in the past few years. However, the complexity of nonlinear emission profiles imposes severe constraints on practical applications, such as in optical communications and integrated optoelectronic devices. These complexities include the lack of unidirectional nonlinear emission and the severe challenges in switching between forward and backward emissions, due to the structure of the susceptibility tensor of the III-V nanoantennas. Here, we propose a solution to both issues via engineering the nonlinear tensor of the nanoantennas. The special nonlinear tensorial properties of zinc-blende material can be used to engineer the nonlinear characteristics via growing the nanoantennas along different crystalline orientations. Based on the nonlinear multipolar effect, we have designed and fabricated (110)-grown GaAs nanoantennas, with engineered tensorial properties, embedded in a transparent low-index material. Our technique provides an approach not only for unidirectional second-harmonic generation (SHG) forward or backward emission but also for switching from one to another. Importantly, switching the SHG emission directionality is obtained only by rotating the polarization of the incident light, without the need for physical variation of the antennas or the environment. This characteristic is an advantage, as compared to other nonlinear nanoantennas, including (100)- and (111)-grown III-V counterparts or silicon and germanium nanoantennas. Indeed, (110)-GaAs nanoantennas allow for engineering the nonlinear nanophotonic systems including nonlinear "Huygens metasurfaces" and offer exciting opportunities for various nonlinear nanophotonics technologies, such as nanoscale light routing and light sources, as well as multifunctional flat optical elements.
Ultra-efficient DC-gated all-optical graphene switch
Publisher: IOP Publishing
Date: 02-09-2022
Abstract: The ultrafast response and broadband absorption of all-optical graphene switches are highly desirable features for on-chip photonic switching. However, because graphene is an atomically thin material, its absorption of guided optical modes is relatively low, resulting in high saturation thresholds and switching energies for these devices. To boost the absorption of graphene, we present a practical design of an electrically-biased all-optical graphene switch that is integrated into silicon slot waveguides, which strongly confine the optical mode in the slotted region and enhance its interaction with graphene. Moreover, the design incorporates a silicon slab layer and a hafnia dielectric layer to electrically tune the saturation threshold and the switching energy of the device by applying direct-current voltages of 0.5 V. Using this device, a high extinction ratio of 10.3 dB, a low insertion loss of 0.7 dB, and an ultra-efficient switching energy of 79 fJ/bit at 0.23 V bias are attainable for a 40 µ m long switch. The reported performance metrics for this device are highly promising and are expected to serve the needs of next-generation photonic computing systems.
Enabling smart vision with metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 22-12-2023
Multipolar properties of guide resonances
Publisher: OSA
Date: 2018
SPASER as a complex system: Femtosecond dynamics traced by ab-initio simulations
Publisher: SPIE
Date: 14-03-2016
DOI: 10.1117/12.2212967
Nonlinear Fano resonance in photonic crystal waveguide and cavity system: Physical properties and applications
Publisher: SPIE
Date: 13-11-2014
DOI: 10.1117/12.2070974
Magnetic microscopy/metrology potential of metamaterials using nanosized spherical particle arrays
Publisher: SPIE
Date: 21-12-2011
DOI: 10.1117/12.904893
Paradoxes in laser heating of plasmonic nanoparticles
Publisher: IOP Publishing
Date: 13-09-2012
All-dielectric Metasurfaces as an Efficient Tool for Electromagnetic Waves Manipulation
Publisher: IEEE
Date: 07-2018
Excitation of nonradiating magnetic anapole states with azimuthally polarized vector beams
Publisher: Beilstein Institut
Date: 17-05-2018
DOI: 10.3762/BJNANO.9.139
Abstract: Nonradiating current configurations have been drawing the attention of the physics community for many years. It has been demonstrated recently that dielectric nanoparticles provide a unique platform to host such nonradiating modes, called “anapoles”. Here we study theoretically the excitation of such exotic anapole modes in silicon nanoparticles using structured light. Alternative illumination configurations, properly designed, are able to unlock hidden behavior of scatterers. Particularly, azimuthally polarized focused beams enable us to excite ideal anapole modes of magnetic type in dielectric nanoparticles. Firstly, we perform the decomposition of this type of excitation into its multipolar content and then we employ the T-matrix method to calculate the far-field scattering properties of nanoparticles illuminated by such beams. We propose several configuration schemes where magnetic anapole modes of simple or hybrid nature can be detected in silicon nanospheres, nanodisks and nanopillars.
Nonlinear Fano resonance and bistable wave transmission
Publisher: American Physical Society (APS)
Date: 30-03-2005
Optical nanoantennas
Publisher: Uspekhi Fizicheskikh Nauk (UFN) Journal
Date: 30-06-2013
Reconfigurable nonreciprocity with a nonlinear Fano diode
Publisher: American Physical Society (APS)
Date: 21-04-2014
Ultrahigh-Q Guided Mode Resonances in An All-dielectric Metasurface
Publisher: Research Square Platform LLC
Date: 30-06-2022
DOI: 10.21203/RS.3.RS-1755479/V1
Abstract: High quality (Q) factor optical resonators are indispensable for many photonic devices. While very large Q-factors can be obtained theoretically in guided mode settings, free-space implementations suffer from various limitations on the narrowest possible linewidth in real experiments. In these devices, the largest Q-factors are hindered by radiation loss induced by fabrication disorder. Complex photonic designs have been explored to enhance this response through either delicate engineering the topological features or carefully breaking symmetries. Here, we put forward a simple strategy to enable ultrahigh-Q guided-mode resonances in all-dielectric metasurfaces without breaking symmetry or carefully engineering topological quantities. We introduce a patterned perturbation layer on top of a multilayer waveguide system, aimed at exciting tailored guided-mode resonances from free space. We demonstrate that the associated Q-factors are inversely proportional to the perturbation squared, suggesting a simple way of achieving extremely high-Q resonances as the perturbation is reduced. The resonant wavelength can be conveniently tuned through material or structural parameters, such as the thickness and refractive index or the metasurface period, within a robust design strategy amenable for implementation in various platforms. We experimentally demonstrate such high-Q resonances at telecom wavelengths by fabricating a low-index photoresist layer photonic crystal slab on top of a 220nm top layer SOI substrate. The measurements show Q-factors up to 2.39x10 5 , comparable to the largest Q-factor obtained by topological engineering, while the resonant wavelength is tuned by varying the lattice constant of the top perturbation layer. Our results hold great promise for exciting applications, such as sensors and filters.
Non-Rayleigh limit of the Lorenz-Mie solution and suppression of scattering by spheres of negative refractive index
Publisher: American Physical Society (APS)
Date: 14-07-2009
Dynamics and instability of nonlinear Fano resonances in photonic crystals
Publisher: American Physical Society (APS)
Date: 12-01-2009
Dynamics of destructive Fano resonances
Publisher: American Physical Society (APS)
Date: 12-11-2019
Effects of surface functional groups on the formation of nanoparticle-protein corona
Publisher: AIP Publishing
Date: 24-12-2012
DOI: 10.1063/1.4772509
Abstract: Herein, we examined the dependence of protein adsorption on the nanoparticle surface in the presence of functional groups. Our UV-visible spectrophotometry, transmission electron microscopy, infrared spectroscopy, and dynamic light scattering measurements evidently suggested that the functional groups play an important role in the formation of nanoparticle-protein corona. We found that uncoated and surfactant-free silver nanoparticles derived from a laser ablation process promoted a maximum protein (bovine serum albumin) coating due to increased changes in entropy. On the other hand, bovine serum albumin displayed a relatively lower affinity for electrostatically stabilized nanoparticles due to the constrained entropy changes.
All-optical switching in photonic structures with liquid-crystal defects
Publisher: IEEE
Date: 2006
Nonlinear control of enhanced scattering in multi-layer nanowires
Publisher: IEEE
Date: 08-2014
Highly-Efficient Longitudinal Second-Harmonic Generation from Doubly-Resonant AlGaAs Nanoantennas
Publisher: MDPI AG
Date: 17-09-2018
Abstract: We design an asymmetric nonlinear optical nanoantenna composed of a dielectric nanodisc and an adjacent nanobar. The proposed composite structure made of AlGaAs exhibits resonant response at both the fundamental and doubled frequencies. Being driven by the strong magnetic dipole resonance at the pump wavelength and a high-quality mode at the harmonic wavelength, the efficient second-harmonic radiation is generated predominantly along the vertical directions under the normally incident plane-wave excitation.
Near-field mapping of Fano resonances in all-dielectric oligomers
Publisher: AIP Publishing
Date: 13-01-2014
DOI: 10.1063/1.4858969
Abstract: We demonstrate experimentally Fano resonances in all-dielectric oligomers clusters of dielectric particles. We study two structures consisting of a ring of six ceramic spheres with and without a central particle and demonstrate that both structures exhibit resonant suppression of the forward scattering associated with the Fano resonance originated from the excitation of magnetic dipole modes. By employing the near-field measurement techniques, we establish the relation between near- and far-field properties of the Fano resonances and identify directly their origin. We support our findings by an analytical approach based on the discrete-dipole approximation and find an excellent agreement with the experimental data.
Multi-field continuum theory for medium with microscopic rotations
Publisher: Elsevier BV
Date: 12-2005
Generalized Brewster effect in dielectric metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 19-01-2016
DOI: 10.1038/NCOMMS10362
Abstract: Polarization is a key property defining the state of light. It was discovered by Brewster, while studying light reflected from materials at different angles. This led to the first polarizers, based on Brewster’s effect. Now, one of the trends in photonics is the study of miniaturized devices exhibiting similar, or improved, functionalities compared with bulk optical elements. In this work, it is theoretically predicted that a properly designed all-dielectric metasurface exhibits a generalized Brewster’s effect potentially for any angle, wavelength and polarization of choice. The effect is experimentally demonstrated for an array of silicon nanodisks at visible wavelengths. The underlying physics is related to the suppressed scattering at certain angles due to the interference between the electric and magnetic dipole resonances excited in the nanoparticles. These findings open doors for Brewster phenomenon to new applications in photonics, which are not bonded to a specific polarization or angle of incidence.
Fano resonances in nanoscale structures
Publisher: American Physical Society (APS)
Date: 11-08-2010
Inelastic three-soliton collisions in a weakly discrete sine-Gordon system
Publisher: IOP Publishing
Date: 31-03-2000
Optimization of cloaking in all dielectric multi-layer structures
Publisher: IEEE
Date: 08-2014
Electrical tuning of all dielectric metasurfaces
Publisher: IEEE
Date: 09-2016
Invisible nanowires with interfering electric and toroidal dipoles
Publisher: The Optical Society
Date: 08-05-2015
DOI: 10.1364/OL.40.002293
Electrically-tunable solid-state metasurfaces via flash localised heating
Publisher: Research Square Platform LLC
Date: 24-05-2022
DOI: 10.21203/RS.3.RS-1665364/V1
Abstract: Metasurfaces have recently realised many revolutionary applications such as metalenses, equation solvers, beam shapers, and holographic projection.1–4 However, the conventional metasurfaces are monotask due to their fixed dimensions. Therefore, realising multitask metasurfaces for applications such as beam steering, optical switches and meta-displays, which require fast and dynamic reconfigurability, has bottlenecked. To address this technological challenge, there has been a quest to enable tunability via mechanical tilting or stretching the s les, rotating the illumination angle or the incident light polarisation, use of chemical reactions, and others.5–8 However, most of these approaches still suffer from slow tuning rate, weak modulation, and bulky or non-solid state components. Here, we introduce electrically tunable metasurfaces that offer up to 9 folds surge in transmission, i.e. 90% transmission modulation depth, with switching time µs, i.e. one order of magnitude faster than video frame rates. To realise such a breakthrough, we have driven the designed metasurface by V spiked voltage, asymmetrically, for the first time in optoelectronics.
Mode transformation in waveguiding plasmonic structures
Publisher: Elsevier BV
Date: 07-2011
Nonradiating sources for efficient wireless power transfer
Publisher: Walter de Gruyter GmbH
Date: 10-11-2021
Abstract: Nonradiating sources of energy realized under a wave scattering on high-index dielectric nanoparticles have attracted a lot of attention in nano-optics and nanophotonics. They do not emit energy to the far-field, but simultaneously provides strong near-field energy confinement. Near-field wireless power transfer technologies suffer from low efficiency and short operation distance. The key factor to improve efficiency is to reduce the radiation loss of the resonators included in the transmitter and receiver. In this paper, we develop a wireless power transfer system based on nonradiating sources implemented using colossal permittivity dielectric disk resonator and a subwavelength metal loop. We demonstrate that this nonradiating nature is due to the hybrid anapole state originated by destructive interference of the fields generated by multipole moments of different parts of the nonradiating source, without a contribution of toroidal moments. We experimentally investigate a wireless power transfer system prototype and demonstrate that higher efficiency can be achieved when operating on the nonradiating hybrid anapole state compared to the systems operating on magnetic dipole and magnetic quadrupole modes due to the radiation loss suppression.
Resonant scattering of solitons
Publisher: AIP Publishing
Date: 11-08-2003
DOI: 10.1063/1.1597071
Abstract: We study the scattering of solitons in the nonlinear Schrödinger equation on local inhomogeneities which may give rise to resonant transmission and reflection. In both cases, we derive resonance conditions for the soliton’s velocity. The analytical predictions are tested numerically in regimes characterized by various time scales. Special attention is paid to intermode interactions and their effect on coherence, decoherence, and dephasing of plane-wave modes which build up the soliton.
Multifield model for Cosserat media
Publisher: Mathematical Sciences Publishers
Date: 09-2008
Broadband unidirectional scattering by magneto-electric core-shell nanoparticles
Publisher: American Chemical Society (ACS)
Date: 04-05-2012
DOI: 10.1021/NN301398A
Abstract: Core-shell nanoparticles have attracted surging interests due to their flexibly tunable resonances and various applications in medical diagnostics, biosensing, nanolasers, and many other fields. The core-shell nanoparticles can support simultaneously both electric and magnetic resonances, and when the resonances are properly engineered, entirely new properties can be achieved. Here we study core-shell nanoparticles that support both electric and artificial magnetic dipolar modes, which are engineered to coincide spectrally with the same strength. We reveal that the interferences of these two resonances result in azimuthally symmetric unidirectional scattering, which can be further improved by arranging the nanoparticles in a chain, with both azimuthal symmetry and vanishing backward scattering preserved over a wide spectral range. We also demonstrate that the vanishing backward scattering is preserved, even for random particle distributions, which can find applications in the fields of nanoantennas, photovoltaic devices, and nanoscale lasers that require backward scattering suppressions.
Linear control of light scattering with multiple coherent waves excitation
Publisher: The Optical Society
Date: 28-10-2019
DOI: 10.1364/OL.44.005310
Atmospheric polycyclic aromatic hydrocarbons in the urban environment: Occurrence, toxicity and source apportionment
Publisher: Elsevier BV
Date: 2016
DOI: 10.1016/J.ENVPOL.2015.08.015
Abstract: Polycyclic Aromatic Hydrocarbons (PAHs) represent a major class of toxic pollutants because of their carcinogenic and mutagenic characteristics. People living in urban areas are regularly exposed to PAHs because of abundance of their emission sources. Within this context, this study aimed to: (i) identify and quantify the levels of ambient PAHs in an urban environment (ii) evaluate their toxicity and (iii) identify their sources as well as the contribution of specific sources to measured concentrations. Sixteen PAHs were identified and quantified in air s les collected from Brisbane. Principal Component Analysis - Absolute Principal Component Scores (PCA-APCS) was used in order to conduct source apportionment of the measured PAHs. Vehicular emissions, natural gas combustion, petrol emissions and evaporative/unburned fuel were the sources identified contributing 56%, 21%, 15% and 8% of the total PAHs emissions, respectively, all of which need to be considered for any pollution control measures implemented in urban areas.
Trends in Quantum Nanophotonics
Publisher: Wiley
Date: 04-2020
Engineering Fano resonances in discrete arrays
Publisher: American Physical Society (APS)
Date: 23-11-2005
Scattering of core-shell nanowires with the interference of electric and magnetic resonances
Publisher: The Optical Society
Date: 15-07-2013
DOI: 10.1364/OL.38.002621
Ultrafast All-Optical Switching with Magnetic Resonances in Nonlinear Dielectric Nanostructures
Publisher: American Chemical Society (ACS)
Date: 29-09-2015
DOI: 10.1021/ACS.NANOLETT.5B02989
Abstract: We demonstrate experimentally ultrafast all-optical switching in subwavelength nonlinear dielectric nanostructures exhibiting localized magnetic Mie resonances. We employ amorphous silicon nanodisks to achieve strong self-modulation of femtosecond pulses with a depth of 60% at picojoule-per-disk pump energies. In the pump-probe measurements, we reveal that switching in the nanodisks can be governed by pulse-limited 65 fs-long two-photon absorption being enhanced by a factor of 80 with respect to the unstructured silicon film. We also show that undesirable free-carrier effects can be suppressed by a proper spectral positioning of the magnetic resonance, making such a structure the fastest all-optical switch operating at the nanoscale.
Infrared all-dielectric Kerker metasurfaces
Publisher: Optica Publishing Group
Date: 18-03-2021
DOI: 10.1364/OE.421187
Abstract: The unidirectional scattering of electromagnetic waves in the backward and forward direction, termed Kerkers’ first and second conditions, respectively, is a prominent feature of sub-wavelength particles, which also has been found recently in all-dielectric metasurfaces. Here we formulate the exact polarizability requirements necessary to achieve both Kerker conditions simultaneously with dipole terms only and demonstrate its equivalence to so-called “invisible metasurfaces”. We further describe the perfect absorption mechanism in all-dielectric metasurfaces through development of an extended Kerker formalism. The phenomena of both invisibility and perfect absorption is shown in a 2D hexagonal array of cylindrical resonators, where only the resonator height is modified to switch between the two states. The developed framework provides critical insight into the range of scattering response possible with all-dielectric metasurfaces, providing a methodology for studying exotic electromagnetic phenomena.
Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor
Publisher: MDPI AG
Date: 27-06-2018
DOI: 10.3390/MA11071091
Damage analysis of a perfect broadband absorber by a femtosecond laser
Publisher: Springer Science and Business Media LLC
Date: 04-11-2019
DOI: 10.1038/S41598-019-52432-X
Abstract: Plasmonic metamaterial absorbers are particularly important in different applications such as photodetectors, microbolometers and solar cells. In this paper, we propose a tungsten boride (WB, a refractory ceramic) based broadband metamaterial absorber whose optical properties is numerically analyzed and experimentally characterized. We have also analyzed the damage characteristics of this absorber using a femtosecond laser and compared with an ordinary Au metamaterial absorber. We observe that WB has almost the double absorption bandwidth with absorption more than 90% over the spectral range of 950 to 1400 nm when compared with the Au counterpart. Furthermore, we show that Au metamaterial is damaged at the power of around 36.4 mW whereas WB metamaterial is not damaged at that power (WB has high Tammann temperature than Au)-however the atom of WB material was knocked off by the bombardment of a femtosecond laser.
Experimental realization of high dimensional synthetic lattices in planar photonic structures
Publisher: OSA
Date: 2018
Resonant light-light interaction in slab waveguides: Angular filters and spectral hole burning
Publisher: SPIE
Date: 15-02-2005
DOI: 10.1117/12.675576
Polychromatic nanofocusing of surface plasmons
Publisher: IEEE
Date: 05-2011
Mid-Wave Infrared Graphene Photodetectors With High Responsivity for On-Chip Gas Sensors
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2023
High-Efficiency Visible Light Manipulation Using Dielectric Metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 24-04-2019
DOI: 10.1038/S41598-019-42444-Y
Abstract: The development of a miniaturised device that provides efficient beam manipulation with high transmittance is extremely desirable for the broad range of applications including holography, metalens, and imaging. Recently, the potential of dielectric metasurfaces has been unleashed to efficiently manipulate the beam with full 2π-phase control by overlapping the electric and magnetic dipole resonances. However, in the visible range for available materials, it comes with the price of higher absorption that reduces efficiency. Here, we have considered dielectric amorphous silicon (a-Si) nanodisk and engineered them in such a way which provides minimal absorption loss in the visible range. We have experimentally demonstrated meta-deflector with high transmittance which operates in the visible wavelengths. The supercell of proposed meta-deflector consists of 15 amorphous silicon nanodisks numerically shows the transmission efficiency of 95% and deflection efficiency of 95% at operating wavelength of 715 nm. However, experimentally measured transmission and deflection efficiencies are 83% and 71%, respectively, having the experimental deflection angle of 8.40°. Nevertheless, by reducing the supercell length, the deflection angle can be controlled, and the value 15.50° was experimentally achieved using eight disks supercell. Our results suggest a new way to realise the highly transmittance metadevice with full 2π-phase control operating with the visible light which could be applicable in the imaging, metalens, holography, and display applications.
Highly sensitive plasmonic metasensor with wide detection range
Publisher: OSA
Date: 2018
Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles
Publisher: The Optical Society
Date: 10-09-2015
DOI: 10.1364/OE.23.024738
Fano resonances in light scattering by finite obstacles
Publisher: Springer International Publishing
Date: 2019
Highly Efficient Near-Infrared Detector Based on Optically Resonant Dielectric Nanodisks
Publisher: MDPI AG
Date: 08-02-2021
DOI: 10.3390/NANO11020428
Abstract: Fast detection of near-infrared (NIR) photons with high responsivity remains a challenge for photodetectors. Germanium (Ge) photodetectors are widely used for near-infrared wavelengths but suffer from a trade-off between the speed of photodetection and quantum efficiency (or responsivity). To realize a high-speed detector with high quantum efficiency, a small-sized photodetector efficiently absorbing light is required. In this paper, we suggest a realization of a dielectric metasurface made of an array of subwavelength germanium PIN photodetectors. Due to the subwavelength size of each pixel, a high-speed photodetector with a bandwidth of 65 GHz has been achieved. At the same time, high quantum efficiency for near-infrared illumination can be obtained by the engineering of optical resonant modes to localize optical energy inside the intrinsic Ge disks. Furthermore, small junction capacitance and the possibility of zero/low bias operation have been shown. Our results show that all-dielectric metasurfaces can improve the performance of photodetectors.
Superscattering of light optimized by a genetic algorithm
Publisher: AIP Publishing
Date: 07-07-2014
DOI: 10.1063/1.4887475
Abstract: We analyse scattering of light from multi-layer plasmonic nanowires and employ a genetic algorithm for optimizing the scattering cross section. We apply the mode-expansion method using experimental data for material parameters to demonstrate that our genetic algorithm allows designing realistic core-shell nanostructures with the superscattering effect achieved at any desired wavelength. This approach can be employed for optimizing both superscattering and cloaking at different wavelengths in the visible spectral range.
Superabsorption of light by nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR05468K
Abstract: It is possible to overcome the fundamental limit of light absorption by a nanoparticle using carefully designed Mie resonances.
On-chip low-loss all-optical MoSe2 modulator
Publisher: Optica Publishing Group
Date: 18-07-2022
DOI: 10.1364/OL.465171
Abstract: Monolayer transition metal dichalcogenides (TMDCs), like MoS 2 , MoSe 2 , WS 2 , and WSe 2 , feature direct bandgaps, strong spin–orbit coupling, and exciton–polariton interactions at the atomic scale, which could be harnessed for efficient light emission, valleytronics, and polaritonic lasing, respectively. Nevertheless, to build next-generation photonic devices that make use of these features, it is first essential to model the all-optical control mechanisms in TMDCs. Herein, a simple model is proposed to quantify the performance of a 35- μ m-long Si 3 N 4 waveguide-integrated all-optical MoSe 2 modulator. Using this model, a switching energy of 14.6 pJ is obtained for a transverse-magnetic (TM) and transverse-electric (TE) polarized pump signals at λ = 480 nm. Moreover, maximal extinction ratios of 20.6 dB and 20.1 dB are achieved for a TM and TE polarized probe signal, respectively, at λ = 500 nm with an ultra-low insertion loss of .3 dB. Moreover, the device operates with an ultrafast recovery time of 50 ps, while maintaining a high extinction ratio for practical applications. These findings facilitate modeling and designing novel TMDC-based photonic devices.
Resonant Dielectric Metagratings for Response Intensified Optical Sensing
Publisher: Wiley
Date: 04-08-2022
Abstract: The development of nanoscale optical sensors is desirable for a broad range of applications, including wearable medical‐diagnostics, biochemical detection, and environmental monitoring. Optical detection platforms based on resonant nanostructures are the golden standard for miniaturized footprint and high optical sensitivity. These sensors function by measuring a shift in resonance wavelength upon binding of analytes to their surface. However, such measurements are sensitive to intensity fluctuations of the illuminating source and its wavelength calibration, which limits their applicability. Here, a novel optical sensing concept based on diffraction measurements from resonant dielectric metagratings is proposed and experimentally demonstrated. It is shown that this approach enables the direct measurement of unknown analytes with enhanced sensitivity and without the need for intensity calibrations. The intensified sensitivity of this metagrating‐sensor is derived from combining the resonant phenomena of the nanostructures with the tailored diffraction from the metagrating, thereby providing the highest sensitivity demonstrated to date amongst grating‐based sensors. As a proof of concept, the metagrating‐sensor was validated using an antibody binding assay, achieving a femtomolar‐level limit of detection. Due to their high sensitivity and robust performance, the proposed metagrating sensors pave the way for novel miniaturized medical diagnostics and biosensing applications.
Mach-Zehnder-Fano interferometer
Publisher: AIP Publishing
Date: 21-09-2009
DOI: 10.1063/1.3232224
Abstract: We introduce a concept of the Mach–Zehnder–Fano interferometer by inserting a cavity exhibiting Fano resonance into a conventional interferometer. By employing the scattering-matrix approach, we demonstrate that the transmission becomes sensitive to a position of the cavity such that an asymmetric structure exhibits a series of narrow resonances with almost perfect reflection. We discuss how to implement this novel geometry in two-dimensional photonic crystals and use direct numerical simulations to demonstrate novel regimes of the resonant transmission and reflection.
Huygens optical elements and Yagi—Uda nanoantennas based on dielectric nanoparticles
Publisher: Pleiades Publishing Ltd
Date: 12-2011
Metamaterials tunable with liquid crystals
Publisher: Springer International Publishing
Date: 02-11-2015
Wave scattering by discrete breathers
Publisher: AIP Publishing
Date: 22-05-2003
DOI: 10.1063/1.1561627
Abstract: We present a theoretical study of linear wave scattering in one-dimensional nonlinear lattices by intrinsic spatially localized dynamic excitations or discrete breathers. These states appear in various nonlinear systems and present a time-periodic localized scattering potential for plane waves. We consider the case of elastic one-channel scattering, when the frequencies of incoming and transmitted waves coincide, but the breather provides with additional spatially localized ac channels whose presence may lead to various interference patterns. The dependence of the transmission coefficient on the wave number q and the breather frequency Ωb is studied for different types of breathers: acoustic and optical breathers, and rotobreathers. We identify several typical scattering setups where the internal time dependence of the breather is of crucial importance for the observed transmission properties.
Coupled-resonator-induced reflection in photonic-crystal waveguide structures
Publisher: The Optical Society
Date: 18-07-2008
DOI: 10.1364/OE.16.011647
Abstract: We study the resonant transmission of light in a coupled-resonator optical waveguide interacting with two nearly identical side cavities. We reveal and describe a novel effect of the coupled-resonator-induced reflection (CRIR) characterized by a very high and easily tunable quality factor of the reflection line, for the case of the inter-site coupling between the cavities and the waveguide. This effect differs sharply from the coupled-resonator-induced transparency (CRIT)--an all-optical analogue of the electromagnetically-induced transparency--which has recently been studied theoretically and experimentally for the structures based on micro-ring resonators and photonic crystal cavities. Both CRIR and CRIT effects have the same physical origin which can be attributed to the Fano-Feshbach resonances in the systems exhibiting more than one resonance. We discuss the applicability of the novel CRIR effect to the control of the slow-light propagation and low-threshold all-optical switching.
Cloaking and enhanced scattering of core-shell plasmonic nanowires
Publisher: The Optical Society
Date: 22-04-2013
DOI: 10.1364/OE.21.010454
All-Dielectric Multilayer Cylindrical Structures for Invisibility Cloaking
Publisher: Springer Science and Business Media LLC
Date: 10-04-2015
DOI: 10.1038/SREP09574
Abstract: We study optical response of all-dielectric multilayer structures and demonstrate that the total scattering of such structures can be suppressed leading to optimal invisibility cloaking. We use experimental material data and a genetic algorithm to reduce the total scattering by adjusting the material and thickness of various layers for several types of dielectric cores at telecommunication wavelengths. Our approach demonstrates 80-fold suppression of the total scattering cross-section by employing just a few dielectric layers.
Nonlinear Fano-Feshbach resonances
Publisher: American Physical Society (APS)
Date: 27-02-2009
Mie Exciton-Polariton in a Perovskite Metasurface
Publisher: American Physical Society (APS)
Date: 29-07-2022
Q-factor and absorption enhancement for plasmonic anisotropic nanoparticles
Publisher: The Optical Society
Date: 26-07-2016
DOI: 10.1364/OL.41.003563
Mapping plasmonic topological states at the nanoscale
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00231A
Abstract: We report on the first experimental observation of topological edge states in zigzag chains of plasmonic nanodisks.
Subwavelength waveguides composed of dielectric nanoparticles
Publisher: American Physical Society (APS)
Date: 30-01-2014
Far‐Field Polarization Engineering from Nonlinear Nanoresonators
Publisher: Wiley
Date: 10-10-2022
Abstract: Nanoresonators fabricated from low‐loss dielectrics with second‐order nonlinearity have emerged as a widespread platform for nonlinear frequency conversion at the nanoscale. However, a persisting challenge in this research is the generated complex far‐field polarization state of the upconverted light, which is a limiting factor in many applications. It will be highly desirable to generate uniform far‐field polarization states across all propagation directions, to control the polarization truly along the optical axis and to simultaneously be able to tune the polarization along the entire circumference of the Poincaré sphere by solely modifying the excitation polarization. Here, a nonlinear nanoresonator combining all these properties is theoretically proposed and experimentally demonstrated. At first, an analytical model connecting the induced multipolar content of a nanoresonator with a desired far‐field polarization is derived. Based on this, a nonlinear dielectric nanoresonator is designed to enable sum‐frequency generation (SFG) with highly pure and tuneable far‐field polarization states. In the experiment, the nanoresonators fabricated from the III‐V semiconductor gallium arsenide in (110)‐orientation are excited in an SFG scheme with in idually controllable excitation beams. The generation of highly uniform and tuneable far‐field polarization states is demonstrated by combining back‐focal plane measurements with Stokes polarimetry.
Electrically tunable all-dielectric optical metasurfaces based on liquid crystals
Publisher: AIP Publishing
Date: 13-02-2017
DOI: 10.1063/1.4976504
Abstract: We demonstrate electrical tuning of the spectral response of a Mie-resonant dielectric metasurface consisting of silicon nanodisks embedded into liquid crystals. We use the reorientation of nematic liquid crystals in a moderate applied electric field to alter the anisotropic permittivity tensor around the metasurface. By switching a control voltage “on” and “off,” we induce a large spectral shift of the metasurface resonances, resulting in an absolute transmission modulation of up to 75%. Our experimental demonstration of voltage control of dielectric metasurfaces paves the way for new types of electrically tunable metadevices, including dynamic displays and holograms.
Tailoring Directional Scattering through Magnetic and Electric Resonances in Subwavelength Silicon Nanodisks
Publisher: American Chemical Society (ACS)
Date: 21-08-2013
DOI: 10.1021/NN402736F
Abstract: Interference of optically induced electric and magnetic modes in high-index all-dielectric nanoparticles offers unique opportunities for tailoring directional scattering and engineering the flow of light. In this article we demonstrate theoretically and experimentally that the interference of electric and magnetic optically induced modes in in idual subwavelength silicon nanodisks can lead to the suppression of resonant backscattering and to enhanced resonant forward scattering of light. To this end we spectrally tune the nanodisk's fundamental electric and magnetic resonances with respect to each other by a variation of the nanodisk aspect ratio. This ability to tune two modes of different character within the same nanoparticle provides direct control over their interference, and, in consequence, allows for engineering the particle's resonant and off-resonant scattering patterns. Most importantly, measured and numerically calculated transmittance spectra reveal that backward scattering can be suppressed and forward scattering can be enhanced at resonance for the particular case of overlapping electric and magnetic resonances. Our experimental results are in good agreement with calculations based on the discrete dipole approach as well as finite-integral frequency-domain simulations. Furthermore, we show useful applications of silicon nanodisks with tailored resonances as optical nanoantennas with strong unidirectional emission from a dipole source.
Boosting Strong Coupling in a Hybrid WSe2 Monolayer–Anapole–Plasmon System
Publisher: American Chemical Society (ACS)
Date: 14-01-2021
Strong Coupling of Exciton and High‐Q Mode in All‐Perovskite Metasurfaces
Publisher: Wiley
Date: 17-10-2022
Abstract: Recently developed halide perovskite semiconductors are viewed as an excellent platform to realize exciton‐polariton at room temperature due to their large oscillation strength. Here, the optimized strong coupling between the exciton of perovskite and quasi‐bound state in the continuum (QBIC) with high‐quality factor ( Q ‐factor), supported by all‐perovskite metagrating, including magnetic dipole (MD)‐QBIC and toroidal dipole (TD)‐QBIC is demonstrated. By taking advantage of extreme electric field confinement enabled by a high‐ Q mode, it is found that the maximum Rabi splitting can be enhanced up to a record high value of 400 meV, almost twice the Rabi splitting reported in the same perovskite‐based subwavelength metasurface. The simulation results reveal that both the Q ‐factor of QBIC mode and the thickness of the perovskite metasurface play dominant roles in the enhanced strong coupling. It is also demonstrated that adding a protection layer of poly(methyl methacrylate) on the top of the perovskite metagrating has a negligible effect on the maximized Rabi‐splitting. These results suggest a new approach for studying exciton‐polaritons and may pave the way toward flexible, large‐scale, and low‐cost integrated polaritonic devices and the realization of polariton lasing at room temperature.
Laser Pulse Heating of Spherical Metal Particles
Publisher: American Physical Society (APS)
Date: 27-12-2011
Femtosecond dynamics of a spaser and unidirectional emission from a perfectly spherical nanoparticle
Publisher: OSA
Date: 2015
Mid-infrared polarization-controlled broadband achromatic metadevice
Publisher: American Association for the Advancement of Science (AAAS)
Date: 11-09-2020
Abstract: This study presents a platform to realize polarization-controlled broadband achromatic metadevice in mid-wavelength infrared.
High-dimensional synthetic lattice with enhanced defect sensitivity in planar photonic structures
Publisher: OSA
Date: 2018
Photonic slide rule with metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 29-03-2022
DOI: 10.1038/S41377-022-00765-0
Abstract: As an elementary particle, a photon that carries information in frequency, polarization, phase, and litude, plays a crucial role in modern science and technology. However, how to retrieve the full information of unknown photons in an ultracompact manner over broad bandwidth remains a challenging task with growing importance. Here, we demonstrate a versatile photonic slide rule based on an all-silicon metasurface that enables us to reconstruct incident photons’ frequency and polarization state. The underlying mechanism relies on the coherent interactions of frequency-driven phase diagrams which rotate at various angular velocities within broad bandwidth. The rotation direction and speed are determined by the topological charge and phase dispersion. Specifically, our metasurface leverages both achromatically focusing and azimuthally evolving phases with topological charges +1 and −1 to ensure the confocal annular intensity distributions. The combination of geometric phase and interference holography allows the joint manipulations of two distinct group delay coverages to realize angle-resolved in-pair spots in a transverse manner- a behavior that would disperse along longitudinal direction in conventional implementations. The spin-orbital coupling between the incident photons and vortex phases provides routing for the simultaneous identification of the photons’ frequency and circular polarization state through recognizing the spots’ locations. Our work provides an analog of the conventional slide rule to flexibly characterize the photons in an ultracompact and multifunctional way and may find applications in integrated optical circuits or pocketable devices.
Probing magnetic and electric optical responses of silicon nanoparticles
Publisher: AIP Publishing
Date: 27-04-2015
DOI: 10.1063/1.4919536
Abstract: We study experimentally both magnetic and electric optically induced resonances of silicon nanoparticles by combining polarization-resolved dark-field spectroscopy and near-field scanning optical microscopy measurements. We reveal that the scattering spectra exhibit strong sensitivity of electric dipole response to the probing beam polarization and attribute the characteristic asymmetry of measured near-field patterns to the excitation of a magnetic dipole mode. The proposed experimental approach can serve as a powerful tool for the study of photonic nanostructures possessing both electric and magnetic optical responses.
Enhanced four-wave mixing from multi-resonant silicon dimer-hole membrane metasurfaces
Publisher: IOP Publishing
Date: 03-2022
Abstract: Tailoring optically resonant features in dielectric metasurfaces unveils a robust scheme to control electromagnetic near fields of light and thus to boost the nanoscale nonlinear light–matter interactions. Membrane metasurfaces offer unique possibilities for supporting multipolar resonances and meanwhile maintaining high mode volume for enhancing nonlinear frequency conversion. Here we design a silicon membrane metasurface consisting of dimer airy holes, as a versatile platform for generating four-wave mixing (FWM). We show that such a metasurface exhibits a multi-resonant feature, including a quasi bound state in the continuum (BIC) generated by the collective toroidal dipole mode excited in the designed subdiffractive periodic system. We show that via employing the BIC mode in the short-wave infrared (SWIR), together with other resonant enhanced electric near fields in the near-infrared (NIR) region, simultaneously, one can convert invisible SWIR light to visible light radiation with high efficiency, via FWM. We experimentally demonstrated a significant FWM emission enhancement from our metasurface, which leads to a conversion efficiency of 0.76 × 10 −6 using pump and signal beam peak intensities as low as 0.33 GW cm −2 and 0.17 GW cm −2 , respectively. Our results open new routes for enhancing nonlinear efficiencies for up-conversion processes.
Nonradiating anapole modes in dielectric nanoparticles
Publisher: Springer Science and Business Media LLC
Date: 27-08-2015
DOI: 10.1038/NCOMMS9069
Abstract: Nonradiating current configurations attract attention of physicists for many years as possible models of stable atoms. One intriguing ex le of such a nonradiating source is known as ‘anapole’. An anapole mode can be viewed as a composition of electric and toroidal dipole moments, resulting in destructive interference of the radiation fields due to similarity of their far-field scattering patterns. Here we demonstrate experimentally that dielectric nanoparticles can exhibit a radiationless anapole mode in visible. We achieve the spectral overlap of the toroidal and electric dipole modes through a geometry tuning, and observe a highly pronounced dip in the far-field scattering accompanied by the specific near-field distribution associated with the anapole mode. The anapole physics provides a unique playground for the study of electromagnetic properties of nontrivial excitations of complex fields, reciprocity violation and Aharonov–Bohm like phenomena at optical frequencies.
Competitive Binding of Natural Amphiphiles with Graphene Derivatives
Publisher: Springer Science and Business Media LLC
Date: 24-07-2013
DOI: 10.1038/SREP02273
Extended SSH Model: Non-Local Couplings and Non-Monotonous Edge States
Publisher: MDPI AG
Date: 19-11-2018
Abstract: We construct a generalized system by introducing an additional long-range hopping to the well-known Su-Schrieffer-Heeger (SSH) model. This system exhibits richer topological properties including non-trivial topological phases and associated localized edge states. We study the zero-energy edge states in detail and derive the edge-state wave functions using two different methods. Furthermore, we propose a possible setup using octupole moments optically excited on an array of dielectric particles for the realization of the system, and by adjusting the coupling strengths between neighboring particles we can control the hotspots (near-field enhancement) in such structures.
Nanobiotechnology can boost crop production and quality: First evidence from increased plant biomass, fruit yield and phytomedicine content in bitter melon (Momordica charantia)
Publisher: Springer Science and Business Media LLC
Date: 26-04-2013
Non-Rayleigh scattering behavior for anisotropic Rayleigh particles
Publisher: The Optical Society
Date: 08-08-2012
DOI: 10.1364/OL.37.003390
Geometry symmetry-free and higher-order optical bound states in the continuum
Publisher: Springer Science and Business Media LLC
Date: 19-07-2021
DOI: 10.1038/S41467-021-24686-5
Abstract: Geometrical symmetry plays a significant role in implementing robust, symmetry-protected, bound states in the continuum (BICs). However, this benefit is only theoretical in many cases since fabricated s les’ unavoidable imperfections may easily break the stringent geometrical requirements. Here we propose an approach by introducing the concept of geometrical-symmetry-free but symmetry-protected BICs, realized using the static-like environment induced by a zero-index metamaterial (ZIM). We find that robust BICs exist and are protected from the disordered distribution of multiple objects inside the ZIM host by its physical symmetries rather than geometrical ones. The geometric-symmetry-free BICs are robust, regardless of the objects’ external shapes and material parameters in the ZIM host. We further show theoretically and numerically that the existence of those higher-order BICs depends only on the number of objects. By practically designing a structural ZIM waveguide, the existence of BICs is numerically confirmed, as well as their independence on the presence of geometrical symmetry. Our findings provide a way of realizing higher-order BICs and link their properties to the disorder of photonic systems.
Active quasi-BIC metasurfaces assisted by epsilon-near-zero materials
Publisher: Optica Publishing Group
Date: 05-04-2023
DOI: 10.1364/OE.486827
Abstract: Active devices play a critical role in modern electromagnetic and photonics systems. To date, the epsilon ( ε )-near-zero (ENZ) is usually integrated with the low Q-factor resonant metasurface to achieve active devices, and enhance the light-matter interaction significantly at the nanoscale. However, the low Q-factor resonance may limit the optical modulation. Less work has been focused on the optical modulation in the low-loss and high Q-factor metasurfaces. Recently, the emerging optical bound states in the continuum (BICs) provides an effective way for achieving high Q-factor resonators. In this work, we numerically demonstrate a tunable quasi-BICs (QBICs) by integrating a silicon metasurface with ENZ ITO thin film. Such a metasurface is composed of five square holes in a unit cell, and hosts multiple BICs by engineering the position of centre hole. We also reveal the nature of these QBICs by performing multipole decomposition and calculating near field distribution. Thanks to the large tunability of ITO’s permittivity by external bias and high-Q factor enabled by QBICs, we demonstrate an active control on the resonant peak position and intensity of transmission spectrum by integrating ENZ ITO thin films with QBICs supported by silicon metasurfaces. We find that all QBICs show excellent performance on modulating the optical response of such a hybrid structure. The modulation depth can be up to 14.8 dB. We also investigate how the carrier density of ITO film influence the near-field trapping and far-field scattering, which in turn influence the performance of optical modulation based on this structure. Our results may find promising applications in developing active high-performance optical devices.
High Fluence Chromium and Tungsten Bowtie Nano-antennas
Publisher: Springer Science and Business Media LLC
Date: 10-09-2019
DOI: 10.1038/S41598-019-49517-Y
Abstract: Nano-antennas are replicas of antennas that operate at radio-frequencies, but with considerably smaller dimensions when compared with their radio frequency counterparts. Noble metals based nano-antennas have the ability to enhance photoinduced phenomena such as localized electric fields, therefore-they have been used in various applications ranging from optical sensing and imaging to performance improvement of solar cells. However, such nano-structures can be damaged in high power applications such as heat resisted magnetic recording, solar thermo-photovoltaics and nano-scale heat transfer systems. Having a small footprint, nano-antennas cannot handle high fluences (energy density per unit area) and are subject to being damaged at adequately high power (some antennas can handle just a few milliwatts). In addition, given that nano-antennas are passive devices driven by external light sources, the potential damage of the antennas limits their use with high power lasers: this liability can be overcome by employing materials with high melting points such as chromium (Cr) and tungsten (W). In this article, we fabricate chromium and tungsten nano-antennas and demonstrate that they can handle 110 and 300 times higher fluence than that of gold (Au) counterpart, while the electric field enhancement is not significantly reduced.
Boosting third-harmonic generation by a mirror-enhanced anapole resonator
Publisher: Springer Science and Business Media LLC
Date: 25-07-2018
DOI: 10.1038/S41377-018-0051-8
Abstract: We demonstrate that a dielectric anapole resonator on a metallic mirror can enhance the third harmonic emission by two orders of magnitude compared to a typical anapole resonator on an insulator substrate. By employing a gold mirror under a silicon nanodisk, we introduce a novel characteristic of the anapole mode through the spatial overlap of resonantly excited Cartesian electric and toroidal dipole modes. This is a remarkable improvement on the early demonstrations of the anapole mode in which the electric and toroidal modes interfere off-resonantly. Therefore, our system produces a significant near-field enhancement, facilitating the nonlinear process. Moreover, the mirror surface boosts the nonlinear emission via the free-charge oscillations within the interface, equivalent to producing a mirror image of the nonlinear source and the pump beneath the interface. We found that these improvements result in an extremely high experimentally obtained efficiency of 0.01%.
Enhanced terahertz magnetic dipole response by subwavelength fiber
Publisher: AIP Publishing
Date: 06-02-2018
DOI: 10.1063/1.5010348
Abstract: Dielectric sub-wavelength particles have opened up a new platform for realization of magnetic light. Recently, we have demonstrated that a dipole emitter by a sub-wavelength fiber leads to an enhanced magnetic response. Here, we experimentally demonstrate an enhanced magnetic dipole source in the terahertz frequency range. By placing the fiber next to the hole in a metal screen, we find that the radiation power can be enhanced more than one order of magnitude. The enhancement is due to the excitation of the Mie-type resonances in the fiber. We demonstrate that such a system is equivalent to a double-fiber system excited by a magnetic source. This coupled magnetic dipole and optical fiber system can be considered a unit cell of metasurfaces for manipulation of terahertz radiation and is a proof-of-concept of a possibility to achieve enhanced radiation of a dipole source in proximity of a sub-wavelength fiber. It can also be scaled down to optical frequencies opening up promising avenues for developing integrated nanophotonic devices such as nanoantennas or lasers on fibers.
Polarizational nonlinear optical response of photonic structures with a liquid crystal defect
Publisher: The Optical Society
Date: 12-02-2009
DOI: 10.1364/OL.34.000488
Abstract: We demonstrate experimentally that a one-dimensional photonic crystal with a homeotropic nematic liquid crystal defect behaves as a polarization-sensitive nonlinear all-optical device. We study statics and dynamics of the nonlinear optical response for linearly and circularly polarized beams and show enhanced light sensitivity and polarization self-modulation effects.
Subwavelength topological edge states in optically resonant dielectric structures
Publisher: American Physical Society (APS)
Date: 24-03-0008
Enhanced Third-Harmonic Generation in Silicon Nanoparticles Driven by Magnetic Response
Publisher: American Chemical Society (ACS)
Date: 21-10-2014
DOI: 10.1021/NL503029J
Abstract: We observe enhanced third-harmonic generation from silicon nanodisks exhibiting both electric and magnetic dipolar resonances. Experimental characterization of the nonlinear optical response through third-harmonic microscopy and spectroscopy reveals that the third-harmonic generation is significantly enhanced in the vicinity of the magnetic dipole resonances. The field localization at the magnetic resonance results in two orders of magnitude enhancement of the harmonic intensity with respect to unstructured bulk silicon with the conversion efficiency limited only by the two-photon absorption in the substrate.
Influence of the backward propagating waves on the twist optical Fréedericksz transition in planar nematic films
Publisher: Informa UK Limited
Date: 08-2011
Photonic topological Chern insulators based on Tellegen metacrystals
Publisher: IOP Publishing
Date: 23-12-2015
Antiferromagnetic response of dielectric nanoparticles coupled to split-ring resonators
Publisher: IEEE
Date: 08-2011
Spin filters with Fano dots
Publisher: Springer Science and Business Media LLC
Date: 02-2004
Hybridization and the origin of Fano resonances in symmetric nanoparticle trimers
Publisher: American Physical Society (APS)
Date: 27-07-2015
High-dimensional synthetic lattice with enhanced defect sensitivity in planar photonic structures
Publisher: OSA
Date: 2018
On beautiful analytic structure of the S-matrix
Publisher: IOP Publishing
Date: 10-2019
Abstract: For an exponentially decaying potential, analytic structure of the s -wave S -matrix can be determined up to the slightest detail, including position of all its poles and their residues. Beautiful hidden structures can be revealed by its domain coloring. A fundamental property of the S -matrix is that any bound state corresponds to a pole of the S -matrix on the physical sheet of the complex energy plane. For a repulsive exponentially decaying potential, none of infinite number of poles of the s -wave S -matrix on the physical sheet corresponds to any physical state. On the second sheet of the complex energy plane, the S -matrix has infinite number of poles corresponding to virtual states and a finite number of poles corresponding to complementary pairs of resonances and anti-resonances. The origin of redundant poles and zeros is confirmed to be related to peculiarities of analytic continuation of a parameter of two linearly independent analytic functions. The overall contribution of redundant poles to the asymptotic completeness relation, provided that the residue theorem can be applied, is determined to be an oscillating function.
Bending light on a chip with airy plasmons
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3644218
Light scattering by nonlinear cylindrical multilayer structures
Publisher: The Optical Society
Date: 19-06-2014
Enhanced Four-Wave Mixing in Doubly Resonant Si Nanoresonators
Publisher: American Chemical Society (ACS)
Date: 10-04-2019
Multi-field modeling of a Cosserat lattice: Models, wave filtering, and boundary effects
Publisher: Elsevier BV
Date: 07-2014
Tuning of hybrid oligomers via femtosecond laser reshaping at nanoscale
Publisher: IEEE
Date: 06-2016
All-optical switching and multistability in photonic structures with liquid crystal defects
Publisher: AIP Publishing
Date: 23-06-2008
DOI: 10.1063/1.2949076
Abstract: We demonstrate that one-dimensional photonic crystals with pure nematic liquid-crystal defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fréedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasistatics electric field analog, and it results from nonlinear coupling between light and a defect mode.
Ultrahigh-Q guided mode resonances in an All-dielectric metasurface
Publisher: Springer Science and Business Media LLC
Date: 10-06-2023
DOI: 10.1038/S41467-023-39227-5
Abstract: High quality(Q) factor optical resonators are indispensable for many photonic devices. While very large Q-factors can be obtained theoretically in guided-mode settings, free-space implementations suffer from various limitations on the narrowest linewidth in real experiments. Here, we propose a simple strategy to enable ultrahigh-Q guided-mode resonances by introducing a patterned perturbation layer on top of a multilayer-waveguide system. We demonstrate that the associated Q-factors are inversely proportional to the perturbation squared while the resonant wavelength can be tuned through material or structural parameters. We experimentally demonstrate such high-Q resonances at telecom wavelengths by patterning a low-index layer on top of a 220 nm silicon on insulator substrate. The measurements show Q-factors up to 2.39 × 10 5 , comparable to the largest Q-factor obtained by topological engineering, while the resonant wavelength is tuned by varying the lattice constant of the top perturbation layer. Our results hold great promise for exciting applications like sensors and filters.
Reversible optical nonreciprocity in periodic structures with liquid crystals
Publisher: AIP Publishing
Date: 08-02-2010
DOI: 10.1063/1.3300824
Abstract: We demonstrate how to achieve reversible nonreciprocal optical response in a periodic photonic structure with a pair of defects, one of them being a nonlinear liquid crystal defect layer. The twin defect structure is symmetric at low intensity and becomes asymmetric above an intensity threshold that corresponds to the optical reordering of the liquid crystal. We show that nonreciprocal effects can be reversed by changing the wavelength as a consequence of the wavelength dependent light localization at the defect mode inside the structure.
Off-resonance field enhancement by spherical nanoshells
Publisher: American Physical Society (APS)
Date: 11-05-2010
Fano resonance in quadratic waveguide arrays
Publisher: The Optical Society
Date: 15-04-2005
DOI: 10.1364/OL.30.000872
Abstract: We study resonant light scattering in arrays of channel optical waveguides in which tunable quadratic non-linearity is introduced as nonlinear defects by periodic poling of single (or several) waveguides in the array. We describe novel features of wave scattering that can be observed in this structure and show that it is a good candidate for observation of Fano resonance in nonlinear optics.
Resonant light reflection in quadratic waveguide arrays
Publisher: IEEE
Date: 2005
Structured Light for Selective Third-Harmonic Generation in Subwavelength Resonators
Publisher: OSA
Date: 2018
Biomolecular sensing using gold nanoparticle-coated ZnO nanotetrapods
Publisher: Springer Science and Business Media LLC
Date: 11-08-2011
DOI: 10.1557/JMR.2011.147
Nonlinear Symmetry Breaking in Symmetric Oligomers
Publisher: American Chemical Society (ACS)
Date: 16-02-2017
Hybrid metal-dielectric nanoantennas for directional emission enhancement
Publisher: OSA
Date: 2015
Localized modes and bistable scattering in nonlinear network junctions
Publisher: American Physical Society (APS)
Date: 02-04-2007
Dipole-fiber systems: radiation field patterns, effective magnetic dipoles, and induced cavity modes
Publisher: SPIE
Date: 22-12-2015
DOI: 10.1117/12.2204783
Lighting up silicon nanoparticles with Mie resonances
Publisher: Springer Science and Business Media LLC
Date: 27-07-2018
DOI: 10.1038/S41467-018-05394-Z
Abstract: As one of the most important semiconductors, silicon has been used to fabricate electronic devices, waveguides, detectors, solar cells, etc. However, the indirect bandgap and low quantum efficiency (10 −7 ) hinder the use of silicon for making good emitters. For integrated photonic circuits, silicon-based emitters with sizes in the range of 100−300 nm are highly desirable. Here, we show the use of the electric and magnetic resonances in silicon nanoparticles to enhance the quantum efficiency and demonstrate the white-light emission from silicon nanoparticles with feature sizes of ~200 nm. The magnetic and electric dipole resonances are employed to dramatically increase the relaxation time of hot carriers, while the magnetic and electric quadrupole resonances are utilized to reduce the radiative recombination lifetime of hot carriers. This strategy leads to an enhancement in the quantum efficiency of silicon nanoparticles by nearly five orders of magnitude as compared with bulk silicon, taking the three-photon-induced absorption into account.
Substrate-Induced Resonant Magnetoelectric Effects for Dielectric Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 02-10-2015
A Carbon Nanotube Toxicity Paradigm Driven by Mast Cells and the IL‐33/ST2 Axis
Publisher: Wiley
Date: 06-07-2012
An explicit finite-difference method to calculate liquid crystal re-orientation dynamics
Publisher: AIP
Date: 2012
DOI: 10.1063/1.4750097
Tunable plasmonic Yagi-Uda nanoantenna
Publisher: IEEE
Date: 09-2011
Nonlinear Mach-Zehnder-Fano interferometer
Publisher: IEEE
Date: 09-2011
Electrically Tunable MnO 2 Based Metasurface
Publisher: IEEE
Date: 09-2018
Third Harmonic Generation Enhanced by Multipolar Interference in Complementary Silicon Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 02-2018
Nonlocal surface plasmon amplification by stimulated emission of radiation
Publisher: American Physical Society (APS)
Date: 16-11-2201
High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces
Publisher: Beilstein Institut
Date: 06-02-2018
DOI: 10.3762/BJNANO.9.44
Abstract: Novel types of optical hybrid metasurfaces consist of metallic and dielectric elements are designed and proposed for controlling the interference between magnetic and electric modes of the system, in a reversible manner. By employing the thermo-optical effect of silicon and gold nanoantennas we demonstrate an active control on the excitation and interference between electric and magnetic modes, and subsequently, the Kerker condition, as a directive radiation pattern with zero backscattering, via temperature control as a versatile tool. This control allows precise tuning optical properties of the system and stimulating switchable sharp spectral Fano-like resonance. Furthermore, it is shown that by adjusting the intermediate distance between metallic and dielectric elements, opposite scattering directionalities are achievable in an arbitrary wavelength. Interestingly, this effect is shown to have a direct influence on nonlinear properties, too, where 10-fold enhancement in the intensity of third harmonic light can be obtained for this system, via heating. This hybrid metasurface can find a wide range of applications in slow light, nonlinear optics and bio-chemical sensing.
Microstructured Optical Fiber-Based Plasmonic Sensors
Publisher: Springer International Publishing
Date: 14-06-2018
Broadband scattering by tapered nanoantennas
Publisher: Wiley
Date: 19-11-2012
Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres
Publisher: American Chemical Society (ACS)
Date: 12-05-2017
Nonlinear Generation of Vector Beams From AlGaAs Nanoantennas
Publisher: American Chemical Society (ACS)
Date: 31-10-2016
DOI: 10.1021/ACS.NANOLETT.6B03525
Abstract: The quest for nanoscale light sources with designer radiation patterns and polarization has motivated the development of nanoantennas that interact strongly with the incoming light and are able to transform its frequency, radiation, and polarization patterns. Here, we demonstrate dielectric AlGaAs nanoantennas for efficient second harmonic generation, enabling the control of both directionality and polarization of nonlinear emission. This is enabled by specialized III-V semiconductor nanofabrication of high-quality AlGaAs nanostructures embedded in optically transparent low-index material, thus allowing for simultaneous forward and backward nonlinear emission. We show that the nanodisk AlGaAs antennas can emit second harmonic in preferential direction with a backward-to-forward ratio of up to five and can also generate complex vector polarization beams, including beams with radial polarization.
Broadband control on scattering events with interferometric coherent waves
Publisher: IOP Publishing
Date: 06-2021
Abstract: We propose a universal strategy to realize a broadband control on arbitrary scatterers, through multiple coherent beams. By engineering the phases and litudes of incident beams, one can suppress the dominant scattering partial waves, making the obstacle lose its intrinsic responses in a broadband spectrum. The associated coherent beams generate a finite and static region, inside which the corresponding electric field intensity and Poynting vector vanish. As a solution to go beyond the sum-rule limit, our methodology is also irrespective of inherent system properties, as well as extrinsic operating wavelength, providing a non-invasive control on the wave-obstacles interaction for any kinds of shape.
Nonlinear Interference and Tailorable Third-Harmonic Generation from Dielectric Oligomers
Publisher: American Chemical Society (ACS)
Date: 05-05-2015
Comment on “Electromagnetic Radiation under Explicit Symmetry Breaking”
Publisher: American Physical Society (APS)
Date: 10-09-2015
Suppression of scattering for small dielectric particles: anapole mode and invisibility
Publisher: The Royal Society
Date: 28-03-2017
Abstract: We reveal that an isotropic, homogeneous, subwavelength particle with high refractive index can produce ultra-small total scattering. This effect, which follows from the inhibition of the electric dipole radiation, can be identified as a Fano resonance in the scattering efficiency and is associated with the excitation of an anapole mode in the particle. This anapole mode is non-radiative and emerges from the destructive interference of electric and toroidal dipoles. The invisibility effect could be useful for the design of highly transparent optical materials. This article is part of the themed issue ‘New horizons for nanophotonics’.
Light-induced orientational effects in periodic photonic structures with pure and dye-doped nematic liquid crystal defects
Publisher: American Physical Society (APS)
Date: 19-11-2008
Bouncing plasmonic waves in half-parabolic potentials
Publisher: American Physical Society (APS)
Date: 02-12-2011
Strong Magnetic Response of Optical Nanofibers
Publisher: American Chemical Society (ACS)
Date: 23-05-2016
Design and Tuning of Substrate-Fabricated Dielectric Metasurfaces Supporting Quasi-Trapped Modes in the Infrared Range
Publisher: American Chemical Society (ACS)
Date: 21-03-2023
Bending of electromagnetic waves in all-dielectric particle array waveguides
Publisher: AIP Publishing
Date: 03-11-2014
DOI: 10.1063/1.4901264
Abstract: We propose and demonstrate experimentally an alternative approach for realizing subwavelength photonic structures, exploiting the waveguiding properties of chains of high-index dielectric disks with both electric and magnetic dipole resonances. We reveal that the electromagnetic energy can be efficiently guided through sharp corners by means of the mode polarization conversion at waveguide bends. We confirm experimentally the guidance through a 90° bend in the microwave frequency range.
An antenna model for the Purcell effect
Publisher: Springer Science and Business Media LLC
Date: 10-08-2015
DOI: 10.1038/SREP12956
Abstract: The Purcell effect is defined as a modification of the spontaneous emission rate of a quantum emitter at the presence of a resonant cavity. However, a change of the emission rate of an emitter caused by an environment has a classical counterpart. Any small antenna tuned to a resonance can be described as an oscillator with radiative losses and the effect of the environment on its radiation can be modeled and measured in terms of the antenna radiation resistance, similar to a quantum emitter. We exploit this analogue behavior to develop a general approach for calculating the Purcell factors of different systems and various frequency ranges including both electric and magnetic Purcell factors. Our approach is illustrated by a general equivalent scheme and it allows resenting the Purcell factor through the continuous radiation of a small antenna at the presence of an electromagnetic environment.
Cascaded four-wave mixing in tapered plasmonic nanoantenna
Publisher: The Optical Society
Date: 20-12-2013
DOI: 10.1364/OL.38.000079
Resonant plasmon scattering by discrete breathers in Josephson junction ladders
Publisher: American Physical Society (APS)
Date: 25-05-2005
Near-Field Mapping of Optical Modes on All-Dielectric Silicon Nanodisks
Publisher: American Chemical Society (ACS)
Date: 25-08-2014
DOI: 10.1021/PH500232U
Highly sensitive selectively coated photonic crystal fiber-based plasmonic sensor
Publisher: The Optical Society
Date: 14-02-2018
DOI: 10.1364/OL.43.000891
Dual-channel spontaneous emission of quantum dots in magnetic metamaterials
Publisher: Springer Science and Business Media LLC
Date: 12-12-2013
DOI: 10.1038/NCOMMS3949
Abstract: Metamaterials, artificial electromagnetic media realized by subwavelength nano-structuring, have become a paradigm for engineering electromagnetic space, allowing for independent control of both electric and magnetic responses of the material. Whereas most metamaterials studied so far are limited to passive structures, the need for active metamaterials is rapidly growing. However, the fundamental question on how the energy of emitters is distributed between both (electric and magnetic) interaction channels of the metamaterial still remains open. Here we study simultaneous spontaneous emission of quantum dots into both of these channels and define the control parameters for tailoring the quantum-dot coupling to metamaterials. By superimposing two orthogonal modes of equal strength at the wavelength of quantum-dot photoluminescence, we demonstrate a sharp difference in their interaction with the magnetic and electric metamaterial modes. Our observations reveal the importance of mode engineering for spontaneous emission control in metamaterials, paving a way towards loss-compensated metamaterials and metamaterial nanolasers.
Energy equipartition and unidirectional emission in a spaser nanolaser
Publisher: Wiley
Date: 18-03-2016
Subwavelength fiber: Enhanced THz Magnetic Source
Publisher: IEEE
Date: 09-2018
Observation of Fano Resonances in All-Dielectric Nanoparticle Oligomers
Publisher: Wiley
Date: 25-02-2014
Abstract: It is well-known that oligomers made of metallic nanoparticles are able to support sharp Fano resonances originating from the interference of two plasmonic resonant modes with different spectral width. While such plasmonic oligomers suffer from high dissipative losses, a new route for achieving Fano resonances in nanoparticle oligomers has opened up after the recent experimental observations of electric and magnetic resonances in low-loss dielectric nanoparticles. Here, light scattering by all-dielectric oligomers composed of silicon nanoparticles is studied experimentally for the first time. Pronounced Fano resonances are observed for a variety of lithographically-fabricated heptamer nanostructures consisting of a central particle of varying size, encircled by six nanoparticles of constant size. Based on a full collective mode analysis, the origin of the observed Fano resonances is revealed as a result of interference of the optically-induced magnetic dipole mode of the central particle with the collective mode of the nanoparticle structure. This allows for effective tuning of the Fano resonance to a desired spectral position by a controlled size variation of the central particle. Such optically-induced magnetic Fano resonances in all-dielectric oligomers offer new opportunities for sensing and nonlinear applications.
Sound trapping in an open resonator
Publisher: Springer Science and Business Media LLC
Date: 10-08-2021
DOI: 10.1038/S41467-021-25130-4
Abstract: The ability of sound energy confinement with high-quality factor resonance is of vital importance for acoustic devices requiring high intensity and hypersensitivity in biological ultrasonics, enhanced collimated sound emission (i.e. sound laser) and high-resolution sensing. However, structures reported so far have been experimentally demonstrated with a limited quality factor of acoustic resonances, up to several tens in an open resonator. The emergence of bound states in the continuum makes it possible to realize high quality factor acoustic modes. Here, we report the theoretical design and experimental demonstration of acoustic bound states in the continuum supported by a single open resonator. We predicted that such an open acoustic resonator could simultaneously support three types of bound states in the continuum, including symmetry protected bound states in the continuum, Friedrich-Wintgen bound states in the continuum induced by mode interference, as well as a new type-mirror symmetry induced bound states in the continuum. We also experimentally demonstrated their existence with quality factor up to one order of magnitude greater than the highest quality factor reported in an open resonator.
Plasmonic Airy beam manipulation in linear optical potentials
Publisher: The Optical Society
Date: 25-03-2011
DOI: 10.1364/OL.36.001164
Enhanced light–matter interaction in two-dimensional transition metal dichalcogenides
Publisher: IOP Publishing
Date: 08-03-2022
Abstract: Two-dimensional (2D) transition metal dichalcogenide (TMDC) materials, such as MoS 2 , WS 2 , MoSe 2 , and WSe 2 , have received extensive attention in the past decade due to their extraordinary electronic, optical and thermal properties. They evolve from indirect bandgap semiconductors to direct bandgap semiconductors while their layer number is reduced from a few layers to a monolayer limit. Consequently, there is strong photoluminescence in a monolayer (1L) TMDC due to the large quantum yield. Moreover, such monolayer semiconductors have two other exciting properties: large binding energy of excitons and valley polarization. These properties make them become ideal materials for various electronic, photonic and optoelectronic devices. However, their performance is limited by the relatively weak light–matter interactions due to their atomically thin form factor. Resonant nanophotonic structures provide a viable way to address this issue and enhance light–matter interactions in 2D TMDCs. Here, we provide an overview of this research area, showcasing relevant applications, including exotic light emission, absorption and scattering features. We start by overviewing the concept of excitons in 1L-TMDC and the fundamental theory of cavity-enhanced emission, followed by a discussion on the recent progress of enhanced light emission, strong coupling and valleytronics. The atomically thin nature of 1L-TMDC enables a broad range of ways to tune its electric and optical properties. Thus, we continue by reviewing advances in TMDC-based tunable photonic devices. Next, we survey the recent progress in enhanced light absorption over narrow and broad bandwidths using 1L or few-layer TMDCs, and their applications for photovoltaics and photodetectors. We also review recent efforts of engineering light scattering, e.g., inducing Fano resonances, wavefront engineering in 1L or few-layer TMDCs by either integrating resonant structures, such as plasmonic/Mie resonant metasurfaces, or directly patterning monolayer/few layers TMDCs. We then overview the intriguing physical properties of different van der Waals heterostructures, and their applications in optoelectronic and photonic devices. Finally, we draw our opinion on potential opportunities and challenges in this rapidly developing field of research.
Beam Steering with Dielectric Metalattices
Publisher: American Chemical Society (ACS)
Date: 07-12-2018
Second-harmonic generation by a graphene nanoparticle
Publisher: American Physical Society (APS)
Date: 11-07-2014
Reversible optical nonreciprocity in periodic structures with liquid crystals
Publisher: IEEE
Date: 09-2010
Giant electric and magnetic Purcell factor in dielectric oligomers
Publisher: Optica Publishing Group
Date: 18-08-2020
DOI: 10.1364/JOSAB.399665
Abstract: We study the near-field enhancement of oligomers composed of high-refractive-index spherical particles. The huge enhancement of the electromagnetic field in the gap between the particles is observed. We reveal that this phenomenon is associated with the Fano-like resonances of both electric and magnetic multipole contributions inside each particle. We also predict that electric and magnetic Purcell factors can be strongly enhanced, being larger than 10 3 . The obtained results represent an important guideline for the realization of dielectric structures to enhance the spontaneous emission rate of quantum sources and various two-level systems.
Low-threshold bistability of slow light in photonic-crystal waveguides
Publisher: The Optical Society
Date: 2007
DOI: 10.1364/OE.15.012380
Abstract: We analyze the resonant transmission of light through a photonic-crystal waveguide side coupled to a Kerr nonlinear cavity, and demonstrate how to design the structure geometry for achieving bistability and all-optical switching at ultralow powers in the slow-light regime. We show that the resonance quality factor in such structures scales inversely proportional to the group velocity of light at the resonant frequency and thus grows indefinitely in the slow-light regime. Accordingly, the power threshold required for all-optical switching in such structures scales as a square of the group velocity, rapidly vanishing in the slow-light regime.
Resonant light scattering by optical solitons
Publisher: American Physical Society (APS)
Date: 07-07-2005
Optically induced interaction of magnetic moments in hybrid metamaterials
Publisher: American Chemical Society (ACS)
Date: 23-12-2012
DOI: 10.1021/NN204348J
Abstract: We propose a novel type of hybrid metal-dielectric structures composed of silicon nanoparticles and split-ring resonators for advanced control of optically induced magnetic response. We reveal that a hybrid "metamolecule" may exhibit a strong distance-dependent magnetic interaction that may flip the magnetization orientation and support "antiferromagnetic" ordering in a hybrid metamaterial created by a periodic lattice of such metamolecules. The propagation of magnetization waves in the hybrid structures opens new ways for manipulating artificial "antiferromagnetic" ordering at high frequencies.
Silver Nanoparticle Protein Corona Composition in Cell Culture Media
Publisher: Public Library of Science (PLoS)
Date: 09-09-2013
Highly efficient broadband polarization control with all-dielectric metasurfaces
Publisher: OSA
Date: 2016
Refractive index sensing with Fano resonances in silicon oligomers
Publisher: The Royal Society
Date: 28-03-2017
Abstract: We demonstrate experimentally refractive index sensing with localized Fano resonances in silicon oligomers, consisting of six disks surrounding a central one of slightly different diameter. Owing to the low absorption and narrow Fano-resonant spectral features appearing as a result of the interference of the modes of the outer and the central disks, we demonstrate refractive index sensitivity of more than 150 nm RIU −1 with a figure of merit of 3.8. This article is part of the themed issue ‘New horizons for nanophotonics’.
Anapole Meta-Atoms: Nonradiating Electric and Magnetic Sources
Publisher: American Physical Society (APS)
Date: 27-08-2021
Simultaneously nearly zero forward and nearly zero backward scattering objects
Publisher: The Optical Society
Date: 05-11-2018
DOI: 10.1364/OE.26.030393
Light-induced freedericksz transition and optical multistability in nematic liquid crystals
Publisher: Institute of Physical Optics
Date: 2007
Third-Harmonic Generation from Silicon Oligomers and Metasurfaces
Publisher: OSA
Date: 2015
Fine-Tuning of the Magnetic Fano Resonance in Hybrid Oligomers via fs-Laser-Induced Reshaping
Publisher: American Chemical Society (ACS)
Date: 03-03-2017
Highly amplitude-sensitive photonic-crystal-fiber-based plasmonic sensor
Publisher: The Optical Society
Date: 18-10-2018
Tunable nonlinear graphene metasurfaces
Publisher: American Physical Society (APS)
Date: 14-10-2015
Multifrequency tapered plasmonic nanoantennas
Publisher: Elsevier BV
Date: 03-2012
Object of the activity systems as a major barrier to the creative use of ICT in schools
Publisher: Australasian Society for Computers in Learning in Tertiary Education
Date: 08-12-2001
DOI: 10.14742/AJET.1797
Abstract: span Despite the research and investment of Information and Communication Technologies (ICT) in schools, many teachers still use it as a neutral tool that is, a tool that can be used to carry out the same teaching and learning activities as have been undertaken previously with non-ICT tools. This paper adopts activity theory as a conceptual framework to describe and analyse how the objectives of two economics courses are shaped by their participants and learning environments, and in turn, how these shared objectives affect the way ICT is used in these courses. The paper goes on to suggest that the object of the activity systems poses a major barrier to the creative use of ICT in schools. /span
Plasmonic analogue of quantum paddle balls
Publisher: IEEE
Date: 08-2011
Complete spectral gap in coupled dielectric waveguides embedded into metal
Publisher: AIP Publishing
Date: 12-07-2010
DOI: 10.1063/1.3458694
Abstract: We study a plasmonic coupler involving backward (TM01) and forward (HE11) modes of dielectric waveguides embedded into an infinite metallic background. The simultaneously achievable contradirectional energy flows and codirectional phase velocities in different channels lead to a spectral gap, despite the absence of periodic structures along the waveguide. We demonstrate that a complete spectral gap can be achieved in a symmetric structure composed of four coupled waveguides.
Multifold Enhancement of Third-Harmonic Generation in Dielectric Nanoparticles Driven by Magnetic Fano Resonances
Publisher: American Chemical Society (ACS)
Date: 15-07-2016
DOI: 10.1021/ACS.NANOLETT.6B01249
Abstract: Strong Mie-type magnetic dipole resonances in all-dielectric nanostructures provide novel opportunities for enhancing nonlinear effects at the nanoscale due to the intense electric and magnetic fields trapped within the in idual nanoparticles. Here we study third-harmonic generation from quadrumers of silicon nanodisks supporting high-quality collective modes associated with the magnetic Fano resonance. We observe nontrivial wavelength and angular dependencies of the generated harmonic signal featuring a multifold enhancement of the nonlinear response in oligomeric systems.
Optomechanics of liquid crystals for dynamical optical response of photonic structures
Publisher: IOP Publishing
Date: 23-05-0011
Manipulation of Airy plasmon beams by linear optical potentials
Publisher: IEEE
Date: 08-2011
Active all-optical spectral tuning of nanorod plasmonic nanoantennas
Publisher: IEEE
Date: 08-2011
Nonlinearly PT-symmetric systems: Spontaneous symmetry breaking and transmission resonances
Publisher: American Physical Society (APS)
Date: 28-07-2011
Functional and nonlinear optical metasurfaces
Publisher: Wiley
Date: 03-2015
Tunable unidirectional nonlinear emission from transition-metal-dichalcogenide metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 22-09-2021
DOI: 10.1038/S41467-021-25717-X
Abstract: Nonlinear light sources are central to a myriad of applications, driving a quest for their miniaturisation down to the nanoscale. In this quest, nonlinear metasurfaces hold a great promise, as they enhance nonlinear effects through their resonant photonic environment and high refractive index, such as in high-index dielectric metasurfaces. However, despite the sub-diffractive operation of dielectric metasurfaces at the fundamental wave, this condition is not fulfilled for the nonlinearly generated harmonic waves, thereby all nonlinear metasurfaces to date emit multiple diffractive beams. Here, we demonstrate the enhanced single-beam second- and third-harmonic generation in a metasurface of crystalline transition-metal-dichalcogenide material, offering the highest refractive index. We show that the interplay between the resonances of the metasurface allows for tuning of the unidirectional second-harmonic radiation in forward or backward direction, not possible in any bulk nonlinear crystal. Our results open new opportunities for metasurface-based nonlinear light-sources, including nonlinear mirrors and entangled-photon generation.
An arrayed nanoantenna for broadband light emission and detection
Publisher: Wiley
Date: 02-08-2011
Instabilities and quasi-localized states in nonlinear Fano-like systems
Publisher: Elsevier BV
Date: 09-2009
Polarisation-independent enhanced scattering by tailoring asymmetric plasmonic systems
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6NR00029K
Abstract: Polarised light provides an efficient way for dynamic control over local optical properties of nanoscale plasmonic structures. Yet many applications that utilise control over the plasmonic near-field would benefit if the plasmonic device maintained the same magnitude of optical response for all polarisations. Here we show that completely asymmetric nanostructures can be designed to exhibit a broadband polarisation-independent and enhanced optical response. We provide both analytical and experimental results on two sets of plasmonic trimer nanostructures consisting of unequal nanodisks/apertures with different gap spacing. We show that, at certain inter-particle separations, enhanced far-field cross sections are independent to the incident polarisation, while still demonstrating nontrivial near-field control.
Control of light scattering by nanoparticles with optically-induced magnetic responses
Publisher: IOP Publishing
Date: 04-2014
Fano resonances: A Discovery that was not made 100 years ago
Publisher: The Optical Society
Date: 12-2008
Directional visible light scattering by silicon nanoparticles
Publisher: Springer Science and Business Media LLC
Date: 26-02-2013
DOI: 10.1038/NCOMMS2538
Abstract: Directional light scattering by spherical silicon nanoparticles in the visible spectral range is experimentally demonstrated for the first time. These unique optical properties arise because of simultaneous excitation and mutual interference of magnetic and electric dipole resonances inside a single nanosphere. Such behaviour is similar to Kerker's-type scattering by hypothetic magneto-dielectric particles predicted theoretically three decades ago. Here we show that directivity of the far-field radiation pattern of single silicon spheres can be strongly dependent on the light wavelength and the nanoparticle size. For nanoparticles with sizes ranging from 100 to 200 nm, forward-to-backward scattering ratio above six can be experimentally obtained, making them similar to 'Huygens' sources. Unique optical properties of silicon nanoparticles make them promising for design of novel low-loss visible- and telecom-range metamaterials and nanoantenna devices.
Shaping the radiation pattern of second-harmonic generation from AlGaAs nonlinear nanoantennas
Publisher: OSA
Date: 2016
Resonant harmonic generation in AlGaAs nanoantennas probed by cylindrical vector beams
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR08034H
Abstract: Cylindrical vector beams with radial and azimuthal polarizations are used to study harmonic generation from in idual AlGaAs nanoantennas.
Dielectric nanoresonators and metamaterials
Publisher: AIP Publishing
Date: 21-10-2019
DOI: 10.1063/1.5129100
Topological Majorana States in Zigzag Chains of Plasmonic Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 27-01-2014
DOI: 10.1021/PH4000949
CLEC-2 promotes inflammatory peritoneal macrophage emigration to draining lymph nodes during endotoxemia
Publisher: Cold Spring Harbor Laboratory
Date: 22-12-2020
DOI: 10.1101/2020.12.21.423770
Abstract: Macrophage recruitment during sterile inflammation and infection is essential to clear pathogens, apoptotic cells and debris. However, persistent macrophage accumulation leads to chronic inflammation. Platelets are emerging as key modulators of the inflammatory response. Here, we identify that platelet C-type-lectin-like receptor-2 (CLEC-2) is a crucial immunomodulatory receptor through the interaction with podoplanin, upregulated on inflammatory macrophages. Mechanistically, platelet CLEC-2 upregulates the expression of podoplanin and its co-ligands CD44 and ERM proteins, leading to actin rearrangement and promotion of cell migration this is mimicked by recombinant CLEC-2-Fc (rCLEC-2-Fc). Treatment of LPS-challenged mice with rCLEC-2-Fc induces a rapid emigration of peritoneal macrophages to mesenteric lymph nodes, through a gradient generated by the podoplanin ligand, CCL21, to prime T cells. We propose that crosslinking podoplanin using rCLEC-2-Fc is a novel, cell-specific strategy to accelerate macrophage removal from the site of inflammation, and hence promote the resolution of the inflammatory response. Persistent macrophage accumulation in inflamed tissue leads to chronic inflammation and organ damage. Bourne et al. identify recombinant CLEC-2-Fc crosslinking podoplanin on inflammatory macrophages, as a cell-specific strategy to accelerate their emigration to draining lymph nodes, and reduce local inflammation.
Reversible and non-reversible tuning of hybrid optical nanoresonators
Publisher: IEEE
Date: 06-2016
Q -factor enhancement in all-dielectric anisotropic nanoresonators
Publisher: American Physical Society (APS)
Date: 23-11-2016
Quasi-bound states in the continuum with a stable resonance wavelength in dimer dielectric metasurfaces
Publisher: Walter de Gruyter GmbH
Date: 05-2023
Abstract: Symmetry-protected bound states in the continuum (SP-BICs) are one of the most intensively studied BICs. Typically, SP-BICs must be converted into quasi-BICs (QBICs) by breaking the unit cell’s symmetry so that they can be accessed by the external excitation. The symmetry-broken usually results in a varied resonance wavelength of QBICs which are also highly sensitive to the asymmetry parameters. In this work, we demonstrate that QBICs with a stable resonance wavelength can be realized by breaking translational symmetry in an all-dielectric metasurface. The unit cell of metasurface is made of a silicon nanodisk dimer. The Q-factor of QBICs is precisely tuned by changing the interspacing of two nanodisks while their resonance wavelength is quite stable against the interspacing. We also find that such BICs show weak dependence on the shape of the nanodisk. Multiple decompositions indicate that the toroidal dipole dominates this type of QBIC. The resonance wavelengths of QBICs can be tuned only by changing either the lattice constants or the radius of nanodisk. Finally, we present experimental demonstrations on such a QBIC with a stable resonance wavelength. The highest measured Q-factor of QBICs is . Our results may find promising applications in enhancing light–matter interaction.
Optical vortices at Fano resonances
Publisher: The Optical Society
Date: 30-11-2012
DOI: 10.1364/OL.37.004985
Dynamic Beam Switching by Liquid Crystal Tunable Dielectric Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 08-02-2018
Hybrid nanoantennas for directional emission enhancement
Publisher: AIP Publishing
Date: 12-2014
DOI: 10.1063/1.4903219
Abstract: Plasmonic and dielectric nanoparticles offer complementary strengths regarding their use as optical antenna elements. While plasmonic nanoparticles are well-known to provide strong decay rate enhancement for localized emitters, all-dielectric nanoparticles can enable high directivity combined with low losses. Here, we suggest a hybrid metal-dielectric nanoantenna consisting of a gold nanorod and a silicon nanodisk, which combines all these advantages. Our numerical analysis reveals a giant enhancement of directional emission together with simultaneously high radiation efficiency (exceeding 70%). The suggested hybrid nanoantenna has a subwavelength footprint, and all parameters and materials are chosen to be compatible with fabrication by two-step electron-beam lithography.
Optical Yagi-Uda nanoantennas
Publisher: Walter de Gruyter GmbH
Date: 14-06-2012
Abstract: Conventional antennas, which are widely employed to transmit radio and TV signals, can be used at optical frequencies as long as they are shrunk to nanometer-size dimensions. Optical nanoantennas made of metallic or high-permittivity dielectric nanoparticles allow for enhancing and manipulating light on the scale much smaller than wavelength of light. Based on this ability, optical nanoantennas offer unique opportunities regarding key applications such as optical communications, photovoltaics, nonclassical light emission, and sensing. From a multitude of suggested nanoantenna concepts the Yagi-Uda nanoantenna, an optical analogue of the well-established radio-frequency Yagi-Uda antenna, stands out by its efficient unidirectional light emission and enhancement. Following a brief introduction to the emerging field of optical nanoantennas, here we review recent theoretical and experimental activities on optical Yagi-Uda nanoantennas, including their design, fabrication, and applications. We also discuss several extensions of the conventional Yagi-Uda antenna design for broadband and tunable operation, for applications in nanophotonic circuits and photovoltaic devices.
Plasmonic Airy beam manipulation by linear optical potentials
Publisher: IEEE
Date: 05-2011
Circular dichroism induced by Fano resonances in planar chiral oligomers
Publisher: Wiley
Date: 16-11-2016
Expansion of cardiac ischemia/reperfusion injury after instillation of three forms of multi-walled carbon nanotubes
Publisher: Springer Science and Business Media LLC
Date: 16-10-2012
Abstract: The exceptional physical-chemical properties of carbon nanotubes have lead to their use in erse commercial and biomedical applications. However, their utilization has raised concerns about human exposure that may predispose in iduals to adverse health risks. The present study investigated the susceptibility to cardiac ischemic injury following a single exposure to various forms of multi-walled carbon nanotubes (MWCNTs). It was hypothesized that oropharyngeal aspiration of MWCNTs exacerbates myocardial ischemia and reperfusion injury (I/R injury). Oropharyngeal aspiration was performed on male C57BL/6J mice with a single amount of MWCNT (0.01 - 100 μg) suspended in 100 μL of a surfactant saline (SS) solution. Three forms of MWCNTs were used in this study: unmodified, commercial grade (C-grade), and functionalized forms that were modified either by acid treatment (carboxylated, COOH) or nitrogenation (N-doped) and a SS vehicle. The pulmonary inflammation, serum cytokine profile and cardiac ischemic/reperfusion (I/R) injury were assessed at 1, 7 and 28 days post-aspiration. Pulmonary response to MWCNT oropharyngeal aspiration assessed by bronchoalveolar lavage fluid (BALF) revealed modest increases in protein and inflammatory cell recruitment. Lung histology showed modest tissue inflammation as compared to the SS group. Serum levels of eotaxin were significantly elevated in the carboxylated MWCNT aspirated mice 1 day post exposure. Oropharyngeal aspiration of all three forms of MWCNTs resulted in a time and/or dose-dependent exacerbation of myocardial infarction. The severity of myocardial injury varied with the form of MWCNTs used. The N-doped MWCNT produced the greatest expansion of the infarct at any time point and required a log concentration lower to establish a no effect level. The expansion of the I/R injury remained significantly elevated at 28 days following aspiration of the COOH and N-doped forms, but not the C-grade as compared to SS. Our results suggest that oropharyngeal aspiration of MWCNT promotes increased susceptibility of cardiac tissue to ischemia/reperfusion injury without a significant pulmonary inflammatory response. The cardiac injury effects were observed at low concentrations of MWCNTs and presence of MWCNTs may pose a significant risk to the cardiovascular system.
Toroidal dipole-induced transparency in core-shell nanoparticles
Publisher: Wiley
Date: 20-08-2015
Plasmonic nanoantennas for efficient control of polarization-entangled photon pairs
Publisher: American Physical Society (APS)
Date: 30-07-2012
Dynamics of Fréedericksz transition in periodic structures
Publisher: IEEE
Date: 2008
Fano-resonance mirrors with photonic crystal waveguides
Publisher: IEEE
Date: 2005
Engineering Fano resonances in photonic structures with nonlinear defects and cavities
Publisher: IEEE
Date: 2005
Enhanced photonic spin Hall effect with subwavelength topological edge states
Publisher: Wiley
Date: 09-05-2016
Experimental demonstration of topological effects in bianisotropic metamaterials
Publisher: Springer Science and Business Media LLC
Date: 03-03-2016
DOI: 10.1038/SREP22270
Abstract: Existence of robust edge states at interfaces of topologically dissimilar systems is one of the most fascinating manifestations of a novel nontrivial state of matter, a topological insulator . Such nontrivial states were originally predicted and discovered in condensed matter physics, but they find their counterparts in other fields of physics, including the physics of classical waves and electromagnetism. Here, we present the first experimental realization of a topological insulator for electromagnetic waves based on engineered bianisotropic metamaterials . By employing the near-field scanning technique, we demonstrate experimentally the topologically robust propagation of electromagnetic waves around sharp corners without backscattering effects.
Invited Article: Broadband highly efficient dielectric metadevices for polarization control
Publisher: AIP Publishing
Date: 06-2016
DOI: 10.1063/1.4949007
Abstract: Metadevices based on dielectric nanostructured surfaces with both electric and magnetic Mie-type resonances have resulted in the best efficiency to date for functional flat optics with only one disadvantage: a narrow operational bandwidth. Here we experimentally demonstrate broadband transparent all-dielectric metasurfaces for highly efficient polarization manipulation. We utilize the generalized Huygens principle, with a superposition of the scattering contributions from several electric and magnetic multipolar modes of the constituent meta-atoms, to achieve destructive interference in reflection over a large spectral bandwidth. By employing this novel concept, we demonstrate reflectionless (∼90% transmission) half-wave plates, quarter-wave plates, and vector beam q-plates that can operate across multiple telecom bands with ∼99% polarization conversion efficiency.
Breathers in Josephson junction ladders: Resonances and electromagnetic wave spectroscopy
Publisher: American Physical Society (APS)
Date: 07-11-2001
Active control over nanofocusing with nanorod plasmonic antennas
Publisher: The Optical Society
Date: 15-03-2011
DOI: 10.1364/OE.19.005888
Enhancement of the nonlinear response in Mach-Zehnder-Fano interferometer
Publisher: IEEE
Date: 08-2011
Surface bound states in the continuum
Publisher: American Physical Society (APS)
Date: 13-02-2012
Elusive Pure Anapole Excitation in Homogenous Spherical Nanoparticles with Radial Anisotropy
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/672957
Abstract: For homogenous isotropic dielectric nanospheres with incident plane waves, Cartesian electric and toroidal dipoles can be tunned to cancel each other in terms of far-field scattering, leading to the effective anopole excitation. At the same time however, other multipoles such as magnetic dipoles with comparable scattered power are simultanesouly excited, mixing with the anopole and leading to a nonnegligible total scattering cross-section. Here, we show that, for homogenous dielectric nanospheres, radial anisotropy can be employed to significantly suppress the other multipole excitation, which at the same time does not compromise the property of complete scattering cancallation between Cartesian electric and toroidal dipoles. This enables an elusive pure anopole excitation within radially anisotropic dielectric nanospheres, which may shed new light on many scattering related fundamental researches and applications.
Toroidal dipole bound states in the continuum
Publisher: American Physical Society (APS)
Date: 16-10-2018
Broadband and thermally stable tungsten boride absorber
Publisher: The Optical Society
Date: 11-09-2019
A discrete model and analysis of one-dimensional deformations in a structural interface with micro-rotations
Publisher: Elsevier BV
Date: 03-2010
Isotropic Magnetic Purcell Effect
Publisher: American Chemical Society (ACS)
Date: 08-12-2017
Electrically programmable solid-state metasurfaces via flash localised heating
Publisher: Springer Science and Business Media LLC
Date: 22-02-2023
DOI: 10.1038/S41377-023-01078-6
Abstract: In the last decades, metasurfaces have attracted much attention because of their extraordinary light-scattering properties. However, their inherently static geometry is an obstacle to many applications where dynamic tunability in their optical behaviour is required. Currently, there is a quest to enable dynamic tuning of metasurface properties, particularly with fast tuning rate, large modulation by small electrical signals, solid state and programmable across multiple pixels. Here, we demonstrate electrically tunable metasurfaces driven by thermo-optic effect and flash-heating in silicon. We show a 9-fold change in transmission by V biasing voltage and the modulation rise-time of µs. Our device consists of a silicon hole array metasurface encapsulated by transparent conducting oxide as a localised heater. It allows for video frame rate optical switching over multiple pixels that can be electrically programmed. Some of the advantages of the proposed tuning method compared with other methods are the possibility to apply it for modulation in the visible and near-infrared region, large modulation depth, working at transmission regime, exhibiting low optical loss, low input voltage requirement, and operating with higher than video-rate switching speed. The device is furthermore compatible with modern electronic display technologies and could be ideal for personal electronic devices such as flat displays, virtual reality holography and light detection and ranging, where fast, solid-state and transparent optical switches are required.
Optical beaming of electrical discharges
Publisher: Springer Science and Business Media LLC
Date: 20-10-2020
DOI: 10.1038/S41467-020-19183-0
Abstract: Igniting and guiding electrical discharges to desired targets in the ambient atmosphere have been a subject of intense research efforts for decades. Ability to control discharge and its propagation can pave the way to a broad range of applications from nanofabrication and plasma medicine to monitoring of atmospheric pollution and, ultimately, taming lightning strikes. Numerous experiments utilizing powerful pulsed lasers with peak-intensity above air photoionization and photo-dissociation have demonstrated excitation and confinement of plasma tracks in the wakes of laser field. Here, we propose and demonstrate an efficient approach for triggering, trapping and guiding electrical discharges in air. It is based on the use of a low-power continuous-wave vortex beam that traps and transports light-absorbing particles in mid-air. We demonstrate a 30% decrease in discharge threshold mediated by optically trapped graphene microparticles with the use of a laser beam of a few hundred milliwatts of power. Our demonstration may pave the way to guiding electrical discharges along arbitrary paths.
Revisiting the physics of Fano resonances for nanoparticle oligomers
Publisher: American Physical Society (APS)
Date: 14-11-2013
Dynamics and instabilities of nonlinear Fano resonances in photonic crystals
Publisher: IEEE
Date: 06-2007
Polarization traffic control for surface plasmons
Publisher: American Association for the Advancement of Science (AAAS)
Date: 19-04-2013
Abstract: Metal surfaces structured at a scale below the wavelength of light create devices that control plasmon beam direction through their polarization. [Also see Reports by Rodríguez-Fortuño et al. and Lin et al. ]
Formation of a Protein Corona on Silver Nanoparticles Mediates Cellular Toxicity via Scavenger Receptors
Publisher: Oxford University Press (OUP)
Date: 17-10-2014
All-optical switching, bistability, and slow-light transmission in photonic crystal waveguide-resonator structures
Publisher: American Physical Society (APS)
Date: 05-10-2006
Electro-optical switching by liquid-crystal controlled metasurfaces
Publisher: The Optical Society
Date: 03-04-2013
DOI: 10.1364/OE.21.008879
Highly-efficient longitudinal second-harmonic generation from doubly-resonant AlGaAs nanoantennas
Publisher: MDPI AG
Date: 23-08-2018
DOI: 10.20944/PREPRINTS201808.0414.V1
Abstract: We design an asymmetric nonlinear optical nanoantenna composed of a dielectric nanodisk and an adjacent nanobar. The proposed composite structure made of AlGaAs exhibits resonant response at both the fundamental and doubled frequencies. Being driven by the strong magnetic dipole resonance at the pump wavelength and a high-quality mode at the harmonic wavelength, the efficient second-harmonic radiation is generated predominantly along the vertical directions under the normally incident plane-wave excitation.
Fano resonances and topological optics: An interplay of far- and near-field interference phenomena
Publisher: IOP Publishing
Date: 03-05-2013
Generalized hybrid anapole modes in all-dielectric ellipsoid particles [Invited]
Publisher: Optica Publishing Group
Date: 04-12-2021
DOI: 10.1364/OME.414340
Abstract: Numerous exciting optical effects in all-dielectric high-refractive-index structures are associated with so-called toroidal electrodynamics. Among these effects are anapoles, nonradiated states caused by interference phenomena, e.g. between electric dipole and toroidal dipole modes. For a spherical particle it is possible to reach simultaneous destructive interference for electric, magnetic, and corresponding toroidal dipole modes (so-called hybrid anapole mode), by varying the refractive index and/or particle size. However, there are no sufficient degrees of freedom within spherical geometry to extend the hybrid anapole mode effect to higher multipoles. Due to the optical theorem, it is also impossible to create the ideal anapole with destructive interference for all multipoles under plane wave illumination. In principle, it is possible to suppress radiation losses for the finite number of multipoles only by constructing the nanoantenna with complex geometry. Our approach of the hybrid anapole state excitation, we demonstrate in ellipsoidal all-dielectric particle providing cancellation of both electric and magnetic scattering up to quadrupole modes. This effect is achieved due to the optimised geometry of the ellipsoidal particle. Moreover, we provide classification of novel anapoles arising due to interference between moments and their mean- square radii (MSR) of electric, magnetic and toroidal family and introduce generalized anapoles for high order interaction between moments. Our concept is useful for the design of light controlling devices, reflectionless metasurfaces, high Q-factor opened resonators and nonscattering particle development.
Impedance Matching Induce High Transmission and Flat Response Band-Pass Plasmonic Waveguides
Publisher: Springer Science and Business Media LLC
Date: 25-02-2011
Polarization control over electric and magnetic dipole resonances of dielectric nanoparticles on metallic films
Publisher: Wiley
Date: 02-08-2016
Nonlinear Mach-Zehnder-Fano interferometer
Publisher: IOP Publishing
Date: 02-2012
All‐Dielectric Metalattice with Enhanced Toroidal Dipole Response
Publisher: Wiley
Date: 13-07-2018
Unconventional Fano resonances in light scattering by small particles
Publisher: IOP Publishing
Date: 02-2012
Magnetic light
Publisher: Springer Science and Business Media LLC
Date: 04-07-2012
DOI: 10.1038/SREP00492
Sound Trapping in an Open Resonator
Publisher: Research Square Platform LLC
Date: 11-03-2021
DOI: 10.21203/RS.3.RS-284982/V1
Abstract: The ability of extreme sound energy confinement with high-quality factor (Q-factor) resonance is of vital importance for acoustic devices requiring high intensity and hypersensitivity in biological ultrasonics, enhanced collimated sound emission (i.e. sound laser) and high-resolution sensing. However, structures reported so far demonstrated a limited quality factor (Q-factor) of acoustic resonances, up to several tens in an open resonator. The emergence of bound states in the continuum (BIC) makes it possible to realize high-Q factor acoustic modes. Here, we report the theoretical design and experimental demonstration of acoustic BICs supported by a single open resonator. We predicted that such an open acoustic resonator could simultaneously support three types of BICs, including symmetry protected BIC, Friedrich-Wintgen BIC induced by mode interference, as well as a new kind of BIC: mirror-symmetry induced BIC. We also experimentally demonstrated the existence of all three types of BIC with Q-factor up to one order of magnitude greater than the highest Q-factor reported in an open resonator.
Electric and magnetic hotspots in dielectric nanowire dimers
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00882D
Abstract: We study the formation of the electric and magnetic near-field hotspots in dielectric cylindrical dimers. We compare dielectric and metallic dimers by using experimental data for all materials and consider both TM and TE polarizations of light. We demonstrate that dielectric dimers allow us to simultaneously achieve pure magnetic and electric near-field hotspots for both polarizations in contrast to plasmonic structures. This offers new approaches for near-field engineering such as sensing, control of spontaneous emission, and enhanced Raman scattering.
Metasurfaces for photonic devices
Publisher: AIP Publishing
Date: 17-11-2022
DOI: 10.1063/5.0131810
Low-threshold optical bistability of graphene-wrapped dielectric composite
Publisher: Springer Science and Business Media LLC
Date: 21-03-2016
DOI: 10.1038/SREP23354
Abstract: We theoretically study the effective third-order nonlinear response and optical bistability of the 3D graphene based composite consisting of graphene wrapped dielectric nanoparticles embedded in dielectric host at terahertz frequencies. Taking into account the nonlinear conductivity of graphene, we derive the analytical expressions for the effective third-order nonlinear coefficient "Equation missing" in weakly nonlinear limit. Moreover, for strong applied fields, the criterion for achieving optical bistability in such a graphene coated sphere, as well as the switching thresholds of optical bistability are discussed. We find that both "Equation missing" and optical bistability are strongly dependent on the Fermi energy of graphene and it is possible to achieve very low switching thresholds under the normal graphene dissipation. We further propose a scheme to study the transmittance of this nonlinear composite slab. These results reveal novel regime of the optical bistability of the transmittance of light. We show that this kind of graphene-wrapped composite, which has tunable and low threshold optical bistability, can be the best candidate for unique nonlinear optical materials.
Actively tunable bistable optical Yagi-Uda nanoantenna
Publisher: The Optical Society
Date: 02-04-2012
DOI: 10.1364/OE.20.008929
Optical Tamm states in arrays of all-dielectric nanoparticles
Publisher: Pleiades Publishing Ltd
Date: 12-2014
Polychromatic nanofocusing of surface plasmon polaritons
Publisher: American Physical Society (APS)
Date: 17-02-2011
Fano resonances in high-index dielectric photonic structures
Publisher: SPIE
Date: 02-05-2014
DOI: 10.1117/12.2051945
Electric and magnetic response of a coupled dipole-nanofiber system
Publisher: OSA
Date: 2016
Sharp bends in photonic crystal waveguides as nonlinear Fano resonators
Publisher: The Optical Society
Date: 2005
Abstract: We demonstrate that high transmission through sharp bends in photonic crystal waveguides can be described by a simple model of the Fano resonance where the waveguide bend plays a role of a specific localized defect.We derive effective discrete equations for two types of the waveguide bends in two-dimensional photonic crystals and obtain exact analytical solutions for the resonant transmission and reflection. This approach allows us to get a deeper insight into the physics of resonant transmission, and it is also useful for the study and design of power-dependent transmission through the waveguide bends with embedded nonlinear defects.
Evidence for Charge-Transfer-Induced Conformational Changes in Carbon Nanostructure–Protein Corona
Publisher: American Chemical Society (ACS)
Date: 09-10-2012
DOI: 10.1021/JP3085028
All-dielectric optical nanoantennas
Publisher: The Optical Society
Date: 23-08-2012
DOI: 10.1364/OE.20.020599
Superabsorption of light by multilayer nanowires
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR06268C
Abstract: Multilayer dielectric and hybrid nanowires make it possible to achieve enhanced, frequency-selective, multiband absorption of light.
Recent advances on strong light-matter coupling in atomically thin TMDC semiconductor materials
Publisher: IOP Publishing
Date: 22-04-2022
Abstract: The strong light–matter interaction between the exciton of atomically thin transition metal dichalcogenides (TMDCs) and photonic nanocavities leads to the formation of unique hybrid light-matter quasiparticles known as exciton-polaritons. The newly formed mixed state has the advantages of the photonic part such as rapid propagation and low effective mass and the highly desirable optical properties of TMDC’s exciton, including the interparticle strong interactions nonlinearity and spin-valley polarization. These joint properties make such systems an ideal platform for studying many compelling physics phenomena and open the possibility of designing novel optoelectronic devices. This work reviews recent progress of strong coupling between exciton in TMDC and different resonant photonic structures, such as optical microcavities, plasmonic and all-dielectric nanocavities. Furthermore, we discussed the unique valleytronic and nonlinear properties of TMDC monolayers in the strong coupling regime. Finally, we highlighted some of the challenges and potential future research opportunities in this field.
Split-ball resonator as a three-dimensional analogue of planar split-rings
Publisher: Springer Science and Business Media LLC
Date: 16-01-2014
DOI: 10.1038/NCOMMS4104
Abstract: Split-ring resonators are basic elements of metamaterials, which can induce a magnetic response in metallic nanosctructures. Tunability of such response up to the visible frequency range is still a challenge. Here we introduce the concept of the split-ball resonator and demonstrate the strong magnetic response in the visible for both gold and silver spherical plasmonic nanoparticles with nanometre scale cuts. We realize this concept experimentally by employing the laser-induced transfer method to produce near-perfect metallic spheres and helium ion beam milling to make cuts with the clean straight sidewalls and nanometre resolution. The magnetic resonance is observed at 600 nm in gold and at 565 nm in silver nanoparticles. This method can be applied to the structuring of arbitrary three-dimensional features on the surface of nanoscale resonators. It provides new ways for engineering hybrid resonant modes and ultra-high near-field enhancement.
Direct measurements of magnetic and electric optical responses from silicon nanoparticles
Publisher: IEEE
Date: 05-2015
Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles
Publisher: American Chemical Society (ACS)
Date: 15-12-2018
Compact surface fano states embedded in the continuum of waveguide arrays
Publisher: American Physical Society (APS)
Date: 10-12-2013
Single protein sensing with asymmetric plasmonic hexamer via Fano resonance enhanced two-photon luminescence
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR04118J
Abstract: Fano resonances in plasmonic systems have been proved to facilitate various sensing applications in the nanoscale. In this work, we propose an experimental scheme to realize a single protein sensing by utilizing its two-photon luminescence enhanced by a plasmonic Fano resonance system. The asymmetric gold hexamer supporting polarization-dependent Fano resonances and plasmonic modes without in-plane rotational symmetry is used as a referenced spatial coordinate for bio-sensing. We demonstrate via the full-vectorial three-dimensional simulation that the moving direction and the spatial location of a protein can be detected via its two-photon luminescence, which benefits from the resonant near-field interaction with the electromagnetic hot-spots. The sensitivity to changes in position of our method is substantially better compared with the conventional linear sensing approach. Our strategy would facilitate the sensing, tracking and imaging of a single biomolecule in deep sub-wavelength scale and with a small optical extinction cross-section.
Synthetic Plasmonic Nanocircuits and the Evolution of Their Correlated Spatial Arrangement and Resonance Spectrum
Publisher: American Chemical Society (ACS)
Date: 23-12-2020
Edge Detection with Mie-Resonant Dielectric Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 16-02-2021
Geometry symmetry-free and Higher-order Optical Bound States in the Continuum
Publisher: Research Square Platform LLC
Date: 14-01-2021
DOI: 10.21203/RS.3.RS-138091/V1
Abstract: Geometrical symmetry plays a significant role in realizing robust, symmetry-protected, bound states in the continuum (BICs). However, this benefit is only theoretical in many cases since the unavoidable imperfections of fabricated s les may easily break the stringent geometrical requirements. Here we propose an essentially new approach by introducing the concept of geometrical-symmetry-free but symmetry-protected BICs, realized using the static-like environment induced by a zero-index metamaterial (ZIM). We find that robust BICs exist and are protected from the disordered distribution of multiple objects inside ZIM host by its physical symmetries rather than geometrical ones. We further show theoretically and numerically that the existence of those higher-order BICs depends only on the number of objects. By practically designing a structural ZIM waveguide, the existence of BICs is numerically confirmed, as well as their independence on the presence of geometrical symmetry. Our findings provide a new way of realizing higher-order BICs and link their properties to disorder of photonic systems.
Giant in-particle field concentration and Fano resonances at light scattering by high-refractive-index particles
Publisher: American Physical Society (APS)
Date: 31-05-2016
Resonant harmonic generation in AlGaAs nanoantennas using cylindrical vector beams
Publisher: OSA
Date: 2018
Tailoring Second-Harmonic Emission from (111)-GaAs Nanoantennas
Publisher: American Chemical Society (ACS)
Date: 28-05-2019
DOI: 10.1021/ACS.NANOLETT.9B01112
Abstract: Second-harmonic generation (SHG) in resonant dielectric Mie-scattering nanoparticles has been hailed as a powerful platform for nonlinear light sources. While bulk-SHG is suppressed in elemental semiconductors, for ex le, silicon and germanium due to their centrosymmetry, the group of zincblende III-V compound semiconductors, especially (100)-grown AlGaAs and GaAs, have recently been presented as promising alternatives. However, major obstacles to push the technology toward practical applications are the limited control over directionality of the SH emission and especially zero forward/backward radiation, resulting from the peculiar nature of the second-order nonlinear susceptibility of this otherwise highly promising group of semiconductors. Furthermore, the generated SH signal for (100)-GaAs nanoparticles depends strongly on the polarization of the pump. In this work, we provide both theoretically and experimentally a solution to these problems by presenting the first SHG nanoantennas made from (111)-GaAs embedded in a low index material. These nanoantennas show superior forward directionality compared to their (100)-counterparts. Most importantly, based on the special symmetry of the crystalline structure, it is possible to manipulate the SHG radiation pattern of the nanoantennas by changing the pump polarization without affecting the linear properties and the total nonlinear conversion efficiency, hence paving the way for efficient and flexible nonlinear beam-shaping devices.
Manipulation of the resonance interaction in Mach-Zehnder-Fano interferometers
Publisher: American Physical Society (APS)
Date: 15-09-2011
Fano Resonances in Optics and Microwaves
Publisher: Springer International Publishing
Date: 2018
Tunable all-optical switching in periodic structures with liquid-crystal defects
Publisher: The Optical Society
Date: 2006
DOI: 10.1364/OE.14.002839
Abstract: We suggest that tunable orientational nonlinearity of nematic liquid crystals can be employed for all-optical switching in periodic photonic structures with liquid-crystal defects. We consider a one-dimensional periodic structure of Si layers with a local defect created by infiltrating a liquid crystal into a pore, and demonstrate, by solving numerically a system of coupled nonlinear equations for the nematic director and the propagating electric field, that the light-induced Freedericksz transition can lead to a sharp switching and diode operation in the photonic devices.
Multi-field approach in mechanics of structural solids
Publisher: Elsevier BV
Date: 02-2010
Beyond the Hybridization Effects in Plasmonic Nanoclusters: Diffraction-Induced Enhanced Absorption and Scattering
Publisher: Wiley
Date: 03-09-2013
Abstract: It is demonstrated herein both theoretically and experimentally that Young's interference can be observed in plasmonic structures when two or three nanoparticles with separation on the order of the wavelength are illuminated simultaneously by a plane wave. This effect leads to the formation of intermediate-field hybridized modes with a character distinct of those mediated by near-field and/or far-field radiative effects. The physical mechanism for the enhancement of absorption and scattering of light due to plasmonic Young's interference is revealed, which we explain through a redistribution of the Poynting vector field and the formation of near-field subwavelength optical vortices.
Fano resonances in all-dielectric oligomers
Publisher: American Chemical Society (ACS)
Date: 29-11-2012
DOI: 10.1021/NL303927Q
Abstract: We demonstrate that light scattering by all-dielectric oligomers exhibits well-pronounced Fano resonances with strong suppression of the scattering cross section. Our analysis reveals that this type of the Fano resonance originates from the optically induced magnetic dipole modes of in idual high-dielectric nanoparticles. By comparing to the plasmonic analogues, we observe that Fano resonances in all-dielectric oligomers are less sensitive to structural variations, which makes them promising for future applications in nanophotonics.
Circular dichroism from Fano resonances in planar chiral oligomers
Publisher: SPIE
Date: 05-05-2015
DOI: 10.1117/12.2183280
Planar narrow bandpass filter based on Si resonant metasurface
Publisher: AIP Publishing
Date: 05-08-2021
DOI: 10.1063/5.0058768
Abstract: Optically resonant dielectric metasurfaces offer unique capability to fully control the wavefront, polarization, intensity, or spectral content of light based on the excitation and interference of different electric and magnetic Mie multipolar resonances. Recent advances of the wide accessibility in nanofabrication and nanotechnologies have led to a surge in the research field of high-quality functional optical metasurfaces, which can potentially replace or even outperform conventional optical components with ultra-thin features. Replacing conventional optical filtering components with metasurface technology offers remarkable advantages, including lower integration cost, ultra-thin compact configuration, easy combination with multiple functions, and less restriction on materials. Here, we propose and experimentally demonstrate a planar narrow bandpass filter based on the optical dielectric metasurface composed of Si nanoresonators in arrays. A broadband transmission spectral valley (around 200 nm) has been realized by combining electric and magnetic dipole resonances adjacent to each other. Meanwhile, we obtain a narrow-band transmission peak by exciting a high-quality leaky mode, which is formed by partially breaking a bound state in the continuum generated by the collective longitudinal magnetic dipole resonances in the metasurface. Owing to the in-plane inversion symmetry of our nanostructure, the radiation of this antisymmetric mode is inhibited at far field, manifesting itself a sharp Fano-shape peak in the spectrum. Our proposed metasurface-based filter shows a stable performance for oblique light incidence with small angles (within 10°). Our work implies many potential applications of nanoscale photonics devices, such as displays, spectroscopy, etc.
Optical Metacages
Publisher: American Physical Society (APS)
Date: 17-11-2015
The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics
Publisher: Wiley
Date: 10-04-2019
Controlling light scattering and polarization by spherical particles with radial anisotropy
Publisher: The Optical Society
Date: 27-03-2013
DOI: 10.1364/OE.21.008091
Resonant light scattering by optical solitons
Publisher: IEEE
Date: 2005
All-optical switching and slow light in photonic-crystal waveguide-resonator structures
Publisher: IEEE
Date: 12-2006
Interplay of Magnetic Responses in All-Dielectric Oligomers to Realize Magnetic Fano Resonances
Publisher: American Chemical Society (ACS)
Date: 18-05-2015
Related Organisations
Specialist In Neurology, Psychiatry, Critical Care, Geriatrics
Location: Austria
Related Funding Activities
Discovery Projects - Grant ID: DP170103778
Start Date: 2017
End Date: 06-2020
Amount: $371,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP180100904
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End Date: 12-2022
Amount: $400,957.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT110100037
Start Date: 2012
End Date: 06-2016
Amount: $578,704.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE200100032
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Amount: $600,000.00
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View Funded ActivityDiscovery Projects - Grant ID: DP130101428
Start Date: 2013
End Date: 12-2016
Amount: $435,000.00
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View Funded ActivityDiscovery Projects - Grant ID: DP200101353
Start Date: 05-2020
End Date: 08-2025
Amount: $450,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0771218
Start Date: 02-2007
End Date: 02-2010
Amount: $231,090.00
Funder: Australian Research Council
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