ORCID Profile
0000-0003-0947-001X
Current Organisation
University of Melbourne
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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)
Photonics, Optoelectronics and Optical Communications | Optical Physics | Nanophotonics | Classical and Physical Optics | Photonics and Electro-Optical Engineering (excl. Communications) | Nanotechnology | Photodetectors, Optical Sensors and Solar Cells | Photonic and electro-optical devices sensors and systems (excl. communications) | Electronics sensors and digital hardware | Electronic device and system performance evaluation testing and simulation |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Instrumentation not elsewhere classified | Emerging Defence Technologies |
Related Links
Publications
Experimental observation of narrow surface plasmon resonances in gold nanoparticle arrays
Publisher: AIP Publishing
Date: 03-11-2008
DOI: 10.1063/1.3012365
Abstract: We demonstrate that coupling between grating diffraction and localized surface plasmons in two-dimensional gold nanoparticle arrays in water leads to narrow near-infrared resonance peaks in measured far field extinction spectra. Good agreement is obtained between finite difference time domain (FDTD) calculations and experimental extinction spectra. The FDTD calculations predict that the gold nanoparticle arrays exhibit near-field electric field intensity (E2) enhancements approximately one order of magnitude greater than those of single isolated gold nanoparticles.
Wafer-scale metasurface for total power absorption, local field enhancement and single molecule Raman spectroscopy
Publisher: Springer Science and Business Media LLC
Date: 04-10-2013
DOI: 10.1038/SREP02867
Surface-Enhanced Raman Scattering with Ag Nanoparticles Optically Trapped by a Photonic Crystal Cavity
Publisher: American Chemical Society (ACS)
Date: 25-01-2013
DOI: 10.1021/NL304069N
Abstract: We demonstrate a reusable and reconfigurable surface enhanced Raman scattering (SERS) platform by optically trapping Ag nanoparticles with a photonic crystal cavity integrated with a microfluidic chip. High-performance SERS is performed in a very reproducible manner, owing to the fact that Ag aggregates are produced by optical trapping in a controllable process that is monitored in real-time by the cavity resonance shift that occurs with the trapping of each additional nanoparticle.
Beyond Toroidal Multipoles
Publisher: OSA
Date: 2017
Si Microwire Solar Cells: Improved Efficiency with a Conformal SiO2 Layer
Publisher: American Chemical Society (ACS)
Date: 16-05-2013
DOI: 10.1021/NN401776X
Abstract: Silicon microwire arrays have attracted considerable attention recently due to the opportunity they present as highly efficient and cost-effective solar cells. In this study, we report on efficient Si microwire array solar cells with areas of 1 cm(2) and Air Mass 1.5 Global conversion efficiencies of up to 10.6%. These solar cells show an open-circuit voltage of 0.56 V, a short-circuit current density of 25.2 mA/cm(2), and a fill factor of 75.2%, with a silicon absorption region that is only 25 μm thick. In particular, the maximum overall efficiency of the ch ion device is improved from 8.71% to 10.6% by conformally coating the wires with a 200 nm thick SiO2 layer. Optical measurements reveal that the layer reduces reflection significantly over the entire visible range.
Vertical Waveguide Arrays as Wavelength Selective Nanostructured Silicon Photodetector Pixels
Publisher: OSA
Date: 2019
Silicon nanofin grating as a miniature chirality-distinguishing beam-splitter
Publisher: Springer Science and Business Media LLC
Date: 12-11-2014
DOI: 10.1038/NCOMMS6386
Abstract: The polarization of light plays a central role in its interaction with matter, in situations ranging from familiar (for ex le, reflection and transmission at an interface) to sophisticated (for ex le, nonlinear optics). Polarization control is therefore pivotal for many optical systems, and achieved using bulk devices such as wave-plates and beam-splitters. The move towards optical system miniaturization therefore motivates the development of micro- and nanostructures for polarization control. For such control to be complete, one must distinguish not only between linear polarizations, but also between left- and right-circular polarizations. Some previous works used surface plasmons to this end, but these are inherently lossy. Other works used complex-layered structures. Here we demonstrate a planar dielectric chirality-distinguishing beam-splitter. The beam-splitter consists of amorphous silicon nanofins on a glass substrate and deflects left- and right-circularly polarized beams into different directions. Contrary to intuitive expectations, we utilize an achiral architecture to realize a chiral beam-splitting functionality.
Refraction contrast imaging with a scanning microlens
Publisher: AIP Publishing
Date: 04-06-2001
DOI: 10.1063/1.1377318
Abstract: We demonstrate subwavelength spatial resolution with a scanning microlens operating in collection mode with a large-area detector. Optical contrast is created by refraction of off-axis light rays at angles larger than the maximum collection angle. With a microfabricated silicon microlens 10 μm in diameter, we measure spatial resolution due to refraction contrast of λ/4.3 at a wavelength of λ=10.7 μm. A model based on ray tracing is developed to explain our result, and we show that lens diameter and index of refraction limit resolution for large emission and collection angles.
High-Energy Four-Wave Mixing, with Large-Mode-Area Higher-Order Modes in Optical Fibres
Publisher: OSA
Date: 2012
Sensing pH in a Microfluidic Channel with a Lab-on-a-Smartphone Fluorescence Spectrometer
Publisher: OSA
Date: 2016
Microscopy with microlens arrays: high throughput, high resolution and light-field imaging
Publisher: The Optical Society
Date: 06-2012
DOI: 10.1364/OE.20.013522
Spectrally selective mid-wave infrared detection using fabry-pérot cavity enhanced black phosphorus 2d photodiodes
Publisher: American Chemical Society (ACS)
Date: 21-09-2020
Self-aligned process for forming microlenses at the tips of vertical silicon nanowires by atomic layer deposition
Publisher: American Vacuum Society
Date: 02-10-2014
DOI: 10.1116/1.4897221
Abstract: The microlens is a key enabling technology in optoelectronics, permitting light to be efficiently coupled to and from devices such as image sensors and light-emitting diodes. Their ubiquitous nature motivates the development of new fabrication techniques, since existing methods face challenges as microlenses are scaled to smaller dimensions. Here, the authors demonstrate the formation of microlenses at the tips of vertically oriented silicon nanowires via a rapid atomic layer deposition process. The nature of the process is such that the microlenses are centered on the nanowires, and there is a self-limiting effect on the final sizes of the microlenses arising from the nanowire spacing. Finite difference time domain electromagnetic simulations are performed of microlens focusing properties, including showing their ability to enhance visible-wavelength absorption in silicon nanowires.
Coherent coupling of multiple transverse modes in a quantum cascade laser
Publisher: IEEE
Date: 05-2008
Surface plasmons in periodically coupled gold nanoparticles: A semi-analytical model
Publisher: IEEE
Date: 05-2008
Bull's eye grating integrated with optical nanoantennas for plasmonic enhancement of graphene long-wave infrared photodetectors
Publisher: AIP Publishing
Date: 04-03-2019
DOI: 10.1063/1.5082664
Abstract: Two-dimensional (2D) materials have exhibited potential for infrared detection at room temperature, yet their low light absorption impedes their widespread application. In addition, micromechanical cleavage, which is the main method by which high-quality 2D layers are achieved, typically leads to small-area flakes, h ering their application as photodetectors. In this work, we designed a hybrid plasmonic structure, comprising a metallic bull's eye grating and optical nanoantennas, to collect and concentrate light into a piece of single-layer graphene with sub-wavelength lateral extent. This boosts the interaction between the graphene and light, thereby improving its photodetection performance in the technologically important long-wave infrared (LWIR) region. Finite-difference time-domain electromagnetic simulations were performed to this end. The plasmonic structure we present is predicted to enhance the absorption of light by the graphene by ∼558 times, which in turn is predicted to enhance the detectivity of the LWIR photodetector by ∼32 times.
Direct Particle Tracking Observation and Brownian Dynamics Simulations of a Single Nanoparticle Optically Trapped by a Plasmonic Nanoaperture
Publisher: American Chemical Society (ACS)
Date: 30-05-2018
Spring constant modulation in a zone plate tweezer using linear polarization
Publisher: Optica Publishing Group
Date: 29-08-2008
DOI: 10.1364/OL.33.002017
Abstract: At large NAs a micro-Fresnel zone plate produces a focal spot that is more elliptical than that produced by an objective lens with the same NA. Using this anisotropy we demonstrate a method for modulating the spring constant of an optical trap by rotating the linear input polarization. The focal spot ellipticity is enhanced by the apodization factor of the zone plate and its extremely high NA. By measuring the positions of trapped particles we obtain two-dimensional histograms of particle position. These indicate that the trap spring constant is 2.75 times larger perpendicular to the incident polarization than along it. The elliptical focal spot distribution can be rotated by rotating the incident polarization, allowing the spring constant along a given direction to be modulated.
Strong Coupling between Excitons in J aggregates and Waveguide Modes in Thin Polymer Films
Publisher: OSA
Date: 2011
Differential Near-Field Scanning Optical Microscopy
Publisher: American Chemical Society (ACS)
Date: 20-10-2006
DOI: 10.1021/NL062110V
Abstract: We theoretically and experimentally illustrate a new apertured near-field scanning optical microscopy (NSOM) technique, termed differential NSOM (DNSOM). It involves scanning a relatively large (e.g., 0.3-2 mum wide) rectangular aperture (or a detector) in the near-field of an object and recording detected power as a function of the scanning position. The image reconstruction is achieved by taking a two-dimensional derivative of the recorded power map. Unlike conventional apertured NSOM, the size of the rectangular aperture/detector does not determine the resolution in DNSOM instead, the resolution is practically determined by the sharpness of the corners of the rectangular aperture/detector. Principles of DNSOM can also be extended to other aperture/detector geometries such as triangles and parallelograms.
Directional Raman Scattering from Single Molecules in the Feed Gaps of Optical Antennas
Publisher: American Chemical Society (ACS)
Date: 04-04-2013
DOI: 10.1021/NL400698W
Abstract: Controlling light from single emitters is an overarching theme of nano-optics. Antennas are routinely used to modify the angular emission patterns of radio wave sources. "Optical antennas" translate these principles to visible and infrared wavelengths and have been recently used to modify fluorescence from single quantum dots and single molecules. Understanding the properties of single molecules, however, would be advanced were one able to observe their vibrational spectra through Raman scattering in a very reproducible manner but it is a hugely challenging task, as Raman scattering cross sections are very weak. Here we measure for the first time the highly directional emission patterns of Raman scattering from single molecules in the feed gaps of optical antennas fabricated on a chip. More than a thousand single molecule events are observed, revealing that an unprecedented near-unity fraction of optical antennas have single molecule sensitivity.
High-throughput fluorescence detection using an integrated zone-plate array
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B923554J
Abstract: Microfluidic devices enable massive parallelization of s le manipulation and delivery, but a similarly parallelized and integrated optical detection system does not yet exist. Standard large numerical aperture wide field or scanning optical systems are not capable of the large field of view and detection sensitivity required to collect fluorescence from parallel arrays of microfluidic devices. Instead, we present a fluorescence measurement platform based on a microfabricated zone-plate array integrated into a parallelized microfluidic device. The zone-plate array is orientated so that a single high numerical aperture zone plate is aligned to read out the fluorescence from each of 64 output channels of a drop-making device. The parallelization of microfluidics and optics produces an integrated system capable of analysis of nearly 200,000 drops per second.
Gold nanorings as substrates for surface-enhanced Raman scattering
Publisher: Optica Publishing Group
Date: 26-02-2010
DOI: 10.1364/OL.35.000760
Copper Tetracyanoquinodimethane (CuTCNQ): A Metal-Organic Semiconductor for Room-Temperature Visible to Long-Wave Infrared Photodetection
Publisher: American Chemical Society (ACS)
Date: 09-08-2021
Silicon nitride light pipes for image sensors
Publisher: SPIE
Date: 19-08-2010
DOI: 10.1117/12.860777
Plasmonic filter arrays for infrared spectral reconstruction
Publisher: OSA
Date: 2017
Flexible Vanadium Dioxide Photodetectors for Visible to Longwave Infrared Detection at Room Temperature
Publisher: Wiley
Date: 21-06-2023
Abstract: Flexible optoelectronics is a rapidly growing field, with a wide range of potential applications. From wearable sensors to bendable solar cells, curved displays, and curved focal plane arrays, the possibilities are endless. The criticality of flexible photodetectors for many of these applications is acknowledged, however, devices that are demonstrated thus far are limited in their spectral range. In this study, flexible photodetectors are demonstrated using a VO x nanoparticle ink, with an extremely broad operating wavelength range of 0.4 to 20 µm. This ink is synthesized using a simple and scalable wet‐chemical process. These photodetectors operate at room temperature and exhibit minimal variance in performance even when bent at angles of up to 100 ° at a bend radius of 6.4 mm. In addition, rigorous strain testing of 100 bend and release cycles revealed a photoresponse with a standard deviation of only 0.55%. This combination of mechanical flexibility, wide spectral response, and ease of fabrication makes these devices highly desirable for a wide range of applications, including low‐cost wearable sensors and hyperspectral imaging systems.
Optical antennas: Resonators for local field enhancement
Publisher: AIP Publishing
Date: 10-2003
DOI: 10.1063/1.1602956
Abstract: Electromagnetic field enhancement in optical antenna arrays is studied by simulation and experiment at midinfrared wavelengths. The optical antennas are designed to produce intense optical fields confined to subwavelength spatial dimensions when illuminated at the resonant wavelength. Finite difference time domain (FDTD) method simulations are made of the current, charge, and field distributions in the antennas. The influence of antenna shape, length, and sharpness upon the intensity of the optical fields produced is found. Optical antennas arrays are fabricated on transparent substrates by electron beam lithography. Far-field extinction spectroscopy carried out on the antenna arrays shows the dependence of the resonant wavelength on the antenna length and material. The FDTD calculated and experimentally measured extinction efficiencies of the optical antennas are found to be in good agreement.
Nanostructured all-silicon photodetector pixels with tailored responsivity spectra
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2541213
Direct Observation of Beamed Raman Scattering
Publisher: American Chemical Society (ACS)
Date: 13-11-2012
DOI: 10.1021/NL303297B
Abstract: Appropriately designed surface plasmon nanostructures enable the emission patterns of surface-enhanced Raman scattering to be modified to facilitate efficient collection, an effect sometimes termed "beamed Raman scattering". Here, we demonstrate the direct and unambiguous observation of this phenomenon by separating the Raman emission pattern from the luminescent background using energy momentum spectroscopy. We observe beamed Raman scattering from two types of optical antennas: the first are Yagi-Uda optical antennas, and the second are optical dimer antennas formed above a plasmonic substrate consisting of a gold film integrated with a one-dimensional array of gold stripes. For both antenna types, the emission patterns from different Raman lines are simultaneously measured. For the second antenna type, the emission patterns show signatures stemming from the bandstructure of the plasmonic substrate.
Graphene-based mid-infrared photodetectors using metamaterials and related concepts
Publisher: AIP Publishing
Date: 19-07-2021
DOI: 10.1063/5.0049633
Abstract: Graphene, a semi-metal with a gapless band structure, has been used in mid-infrared (MIR) photodetectors (PDs) for some time. However, these detectors often suffer from low responsivity due to the intrinsically low absorption and ultra-short carrier lifetime in graphene, large dark current, and low detectivity due to the semi-metallic nature of graphene. Over the past decade, much effort has been devoted to addressing these issues. A variety of metamaterials and related concepts has been employed to improve the detector responsivity by enhancing the graphene absorption and/or the carrier collection efficiency. Here, we provide an overview of the graphene MIR PDs with and without the use of approaches for responsivity enhancement. We focus our attention on the state-of-the-art graphene MIR PDs whose performance is improved by employing metamaterials and related concepts, including band structure engineering, the photogating effect, integration with plasmonic nanostructures and waveguides, the use of asymmetric plasmons, coupled plasmon–phonon polaritons, and small-twist-angle bilayer graphene. We conclude by providing possible directions for further performance improvement of graphene MIR PDs and a discussion on future applications of these detectors.
Polarization-resolved Imaging using Elliptical Silicon Nanowire Photodetectors
Publisher: OSA
Date: 2014
Gigapixel fluorescence microscopy with a water immersion microlens array
Publisher: The Optical Society
Date: 23-01-2013
DOI: 10.1364/OE.21.002361
Beamed Raman: directional excitation and emission enhancement in a plasmonic crystal double resonance SERS substrate
Publisher: The Optical Society
Date: 29-09-2011
DOI: 10.1364/OE.19.020054
Surface enhanced Raman spectroscopy of polycyclic aromatic hydrocarbons and molecular asphaltenes
Publisher: Elsevier BV
Date: 2015
Lithographically Prepared SERS-Active Substrates with Well-Defined Gaps Below 1 nm
Publisher: WORLD SCIENTIFIC (EUROPE)
Date: 06-12-2017
Manipulating nano- and microparticles using optical forces from surface plasmons and silicon microresonators
Publisher: IEEE
Date: 2011
Polarization-resolved black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with high detectivity at room temperature
Publisher: Springer Science and Business Media LLC
Date: 27-08-2018
Reconfigurable Imaging Systems Using Elliptical Nanowires
Publisher: American Chemical Society (ACS)
Date: 22-09-2011
DOI: 10.1021/NL202324S
Abstract: Materials that have subwavelength structure can add degrees of freedom to optical system design that are not possible with bulk materials. We demonstrate two lenses that are composed out of lithographically patterned arrays of elliptical cross-section silicon nanowires, which can dynamically reconfigure their imaging properties in response to the polarization of the illumination. In each element, two different focusing functions are polarization encoded into a single lens. The first nanowire lens has a different focal length for each linear polarization state, thereby realizing the front end of a nonmechanical zoom imaging system. The second nanowire lens has a different optical axis for each linear polarization state, demonstrating stereoscopic image capture from a single physical aperture.
Conversion of Polarization State to Visible Color by Anisotropic Plasmonic Cross Antenna Arrays
Publisher: OSA
Date: 2011
Optical trapping of dielectric nanoparticles in resonant cavities
Publisher: American Physical Society (APS)
Date: 16-11-2010
Microparticle sorting using a slot waveguide splitter
Publisher: SPIE
Date: 10-02-2011
DOI: 10.1117/12.874950
Dielectric Metasurface Comprising Color Hologram Encoded into a Color Printing Image
Publisher: OSA
Date: 2019
Actively variable-spectrum optoelectronics with black phosphorus
Publisher: Springer Science and Business Media LLC
Date: 11-08-2021
DOI: 10.1038/S41586-021-03701-1
Abstract: Room-temperature optoelectronic devices that operate at short-wavelength and mid-wavelength infrared ranges (one to eight micrometres) can be used for numerous applications
Toward Wide-Angle Microvision Sensors
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2013
Polarization State Generation and Detection by VCSELs with Integrated Metasurfaces
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_AT.2020.AM4K.5
Abstract: We experimentally demonstrate vertical-cavity surface-emitting lasers (VCSEL) with integrated plasmonic and dielectric metasurfaces. The metasurfaces shape the polarization of the laser emission from the VCSELs and also enable them to serve as polarization-dependent photodetectors.
Vertical germanium nanowires as spectrally-selective absorbers across the visible-to-infrared
Publisher: AIP Publishing
Date: 10-11-2014
DOI: 10.1063/1.4901438
Abstract: Nanostructuring a material permits control over its interaction with light. Advanced methods for controlling the visible-to-infrared absorption spectra of semiconductor materials would present opportunities for photodetectors with engineered spectral response. Here, we experimentally demonstrate the fabrication of arrays of vertical Ge nanowires with different diameters. Measured reflection spectra show dip features for which electromagnetic simulations predict enhanced absorption. These can be shifted to longer wavelengths by increasing the diameters of the nanowires. We show that the reflectance dips broaden if the nanowires exhibit tapering. We furthermore show that observed ripple features in the dips are associated with longitudinal modes of the nanowires.
Plasmonic Enhancement of Graphene Long-Wave Infrared Photodetectors via Bull's Eye Concentrator, Optical Cavity and Nanoantennas
Publisher: IEEE
Date: 06-2019
Ultracompact, broadband slot waveguide polarization splitter
Publisher: AIP Publishing
Date: 11-04-2011
DOI: 10.1063/1.3579243
Abstract: In this letter, we demonstrate an ultracompact polarization splitter design leveraging the giant birefringence of silicon-on-insulator slot waveguides. The fabricated splitter device has a coupling length of only 13.6 μm, and shows average polarization extinction ratios of 21 dB and 17 dB for the TE and TM polarizations, respectively, over the entire C-band.
Detector-only spectrometer based on structurally colored silicon nanowires and a reconstruction algorithm
Publisher: American Chemical Society (ACS)
Date: 12-12-2020
DOI: 10.1021/ACS.NANOLETT.9B03862
Abstract: Spectroscopy is a cornerstone in the field of optics. Conventional spectrometers generally require two elements. The first provides wavelength selectivity, for ex le, diffraction grating or Michelson interferometer. The second is a detector (or detector array). Many applications would benefit from very small and lightweight spectrometers. This motivates us to investigate what may be regarded as an ultimate level of miniaturization for a spectrometer, in which it consists solely of a detector array. We demonstrate a chip containing 24 pixels, each comprising a silicon nanowire (Si NW) array photodetector formed above a planar photodetector. The NWs are structurally colored, enabling us to engineer the responsivity spectra of all photodetectors in the chip. Each pixel thus combines wavelength selectivity and photodetection functions. We demonstrate the use of our chip to reconstruct the spectrum of an unknown light source impinging upon it. This is achieved by an algorithm that takes as its inputs the measured photocurrents from the pixels and a library of their responsivity spectra.
Experimental Demonstration of Mid-Infrared Computational Spectroscopy with a Plasmonic Filter Array
Publisher: OSA
Date: 2018
Multiplexed pressure sensing with elastomer membranes
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1LC20114J
Abstract: We demonstrate a novel optical pressure measurement platform for microfluidics. The pressure sensors operate as pneumatically-tunable microlenses whose focal lengths vary with pressure. We show that pneumatic lens arrays can be used to perform sensitive multiplexed pressure measurements in microfluidic channels.
Long-Wave Infrared Photodetectors Based on Platinum Diselenide
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C11E_5
Abstract: We demonstrate long wave infrared photodetectors based on the transition metal dichalcogenide platinum diselenide (PtSe 2 ) in its bulk form for the first time to our knowledge. Fabricated devices show sub-millisecond response times.
Air-bridged photonic crystal slabs at visible and near-infrared wavelengths
Publisher: American Physical Society (APS)
Date: 30-03-2006
Vectorial Holograms with Spatially Continuous Polarization Distributions
Publisher: American Chemical Society (ACS)
Date: 05-02-2021
Metasurface with metallic nanoantennas and graphene nanoslits for sensing of protein monolayers and sub-monolayers
Publisher: Optica Publishing Group
Date: 05-06-2020
DOI: 10.1364/OE.394564
Abstract: Biomolecule sensing plays an important role in both fundamental biological studies and medical diagnostic applications. Infrared (IR) spectroscopy presents opportunities for sensing biomolecules as it allows their fingerprints to be determined by directly measuring their absorption spectra. However, the detection of biomolecules at low concentrations is difficult with conventional IR spectroscopy due to signal-to-noise considerations. This has led to recent interest on the use of nanostructured surfaces to boost the signals from biomolecules in a method termed surface enhanced infrared spectroscopy. So far, efforts have largely involved the use of metallic nanoantennas (which produce large field enhancement) or graphene nanostructures (which produce strong field confinement and provide electrical tunability). Here, we propose a nanostructured surface that combines the large field enhancement of metallic nanoantennas with the strong field confinement and electrical tunability of graphene plasmons. Our device consists of an array of plasmonic nanoantennas and graphene nanoslits on a resonant substrate. We perform systematic electromagnetic simulations to quantify the sensing performance of the proposed device and show that it outperforms designs in which only plasmons from metallic nanoantennas or plasmons from graphene are utilized. These investigations consider the model system of a representative protein-goat anti-mouse immunoglobulin G (IgG) – in monolayer or sub-monolayer form. Our findings provide guidance for future biosensors for the sensitive quantification and identification of biomolecules.
Measuring the pressures across microfluidic droplets with an optical tweezer
Publisher: The Optical Society
Date: 11-10-2012
DOI: 10.1364/OE.20.024450
Quantum mechanical limit to plasmonic enhancement as observed by surface-enhanced Raman scattering
Publisher: Springer Science and Business Media LLC
Date: 14-10-2014
DOI: 10.1038/NCOMMS6228
Abstract: Plasmonic nanostructures enable light to be concentrated into nanoscale 'hotspots', wherein the intensity of light can be enhanced by orders of magnitude. This plasmonic enhancement significantly boosts the efficiency of nanoscale light-matter interactions, enabling unique linear and nonlinear optical applications. Large enhancements are often observed within narrow gaps or at sharp tips, as predicted by the classical electromagnetic theory. Only recently has it become appreciated that quantum mechanical effects could emerge as the feature size approaches atomic length-scale. Here we experimentally demonstrate, through observations of surface-enhanced Raman scattering, that the emergence of electron tunnelling at optical frequencies limits the maximum achievable plasmonic enhancement. Such quantum mechanical effects are revealed for metallic nanostructures with gap-widths in the single-digit angstrom range by correlating each structure with its optical properties. This work furthers our understanding of quantum mechanical effects in plasmonic systems and could enable future applications of quantum plasmonics.
Multifunctional Dielectric Metasurfaces Consisting of Color Holograms Encoded into Color Printed Images
Publisher: Wiley
Date: 21-10-2020
Ultra-resolution scalable microprinting
Publisher: Springer Science and Business Media LLC
Date: 25-05-2023
DOI: 10.1038/S41378-023-00537-9
Abstract: Projection micro stereolithography (PµSL) is a digital light processing (DLP) based printing technique for producing structured microparts. In this approach there is often a tradeoff between the largest object that can be printed and the minimum feature size, with higher resolution generally reducing the overall extent of the structure. The ability to produce structures with high spatial resolution and large overall volume, however, is immensely important for the creation of hierarchical materials, microfluidic devices and bioinspired constructs. In this work, we report a low-cost system with 1 µm optical resolution, representing the highest resolution system yet developed for the creation of micro-structured parts whose overall dimensions are nevertheless on the order of centimeters. To do so, we examine the limits at which PµSL can be applied at scale as a function of energy dosage, resin composition, cure depth and in-plane feature resolution. In doing so we develop a unique exposure composition approach that allows us to greatly improve the resolution of printed features. This ability to construct high-resolution scalable microstructures has the potential to accelerate advances in emerging areas, including 3D metamaterials, tissue engineering and bioinspired constructs.
Propulsion of Gold Nanoparticles with Surface Plasmon Polaritons: Evidence of Enhanced Optical Force from Near-Field Coupling between Gold Particle and Gold Film
Publisher: American Chemical Society (ACS)
Date: 22-06-2009
DOI: 10.1021/NL900944Y
Abstract: We experimentally demonstrate the enhanced propulsion of gold nanoparticles by surface plasmon polaritons (SPPs). Three dimensional finite difference time domain (FDTD) simulations indicate considerably enhanced optical forces due to the field enhancement provided by SPPs and the near-field coupling between the gold particles and the film. This coupling is an important part of the enhanced propulsion phenomenon. Finally, the measured optical force is compared with that predicted by FDTD simulations and proven to be reasonable.
Planar silicon microrings as wavelength-multiplexed optical traps for storing and sensing particles
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1LC20574A
Abstract: We demonstrate the trapping of particles with silicon microring resonators integrated with waveguides. Multiple microrings with different resonant wavelengths are integrated with each waveguide. We demonstrate that tuning the laser wavelength to the resonance wavelengths of different rings enables trapped particles to be transferred back and forth between the rings. We demonstrate that the change in output power arising from particle-induced resonance shift enables the real-time monitoring of trapped particles, such as their number and velocities, without the need for an external imaging system. The techniques we describe here could form the basis for small footprint systems in which objects are moved between multiple locations on a chip, at each of which different operations are performed and the objects' properties sensed.
Solution-Synthesized High-Mobility Tellurium Nanoflakes for Short-Wave Infrared Photodetectors
Publisher: American Chemical Society (ACS)
Date: 18-06-2018
Abstract: Two-dimensional (2D) materials, particularly black phosphorus (bP), have demonstrated themselves to be excellent candidates for high-performance infrared photodetectors and transistors. However, high-quality bP can be obtained only via mechanical exfoliation from high-temperature- and high-pressure-grown bulk crystals and degrades rapidly when exposed to ambient conditions. Here, we report solution-synthesized and air-stable quasi-2D tellurium (Te) nanoflakes for short-wave infrared (SWIR) photodetectors. We perform comprehensive optical characterization via polarization-resolved transmission and reflection measurements and report the absorbance and complex refractive index of Te crystals. It is found that this material is an indirect semiconductor with a band gap of 0.31 eV. From temperature-dependent electrical measurements, we confirm this band-gap value and find that 12 nm thick Te nanoflakes show high hole mobilities of 450 and 1430 cm
Plasmonics for Surface Enhanced Raman Scattering: Nanoantennas for Single Molecules
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2014
Lithographically‐Fabricated SERS Substrates: Double Resonances, Nanogaps, and Beamed Emission
Publisher: Wiley
Date: 21-02-2014
Efficient polarization beam splitter pixels based on a dielectric metasurface
Publisher: The Optical Society
Date: 15-04-2015
Strong coupling between localized and propagating surface plasmons: Experimental observation
Publisher: IEEE
Date: 11-2008
Bowtie plasmonic quantum cascade laser antenna
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.013272
Abstract: We report a bowtie plasmonic quantum cascade laser antenna that can confine coherent mid-infrared radiation well below the diffraction limit. The antenna is fabricated on the facet of a mid-infrared quantum cascade laser and consists of a pair of gold fan-like segments, whose narrow ends are separated by a nanometric gap. Compared with a nano-rod antenna composed of a pair of nano-rods, the bowtie antenna efficiently suppresses the field enhancement at the outer ends of the structure, making it more suitable for spatially-resolved high-resolution chemical and biological imaging and spectroscopy. The antenna near field is characterized by an apertureless near-field scanning optical microscope field confinement as small as 130 nm is demonstrated at a wavelength of 7.0 mum.
Mixed Dimer Double-Resonance Substrates for Surface-Enhanced Raman Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 16-12-2010
DOI: 10.1021/NN102726J
Abstract: Surface-enhanced Raman spectroscopy is performed on pairs of gold nanoparticles, for which the nanoparticles in each pair have different shapes. The dimers therefore exhibit two plasmon resonances. These structures, termed mixed dimer double-resonance substrates, enable strong field enhancement at pump and Stokes frequencies in surface-enhanced Raman spectroscopy. The extinction spectra of mixed dimers are measured and simulated to identify their plasmon resonances. The experimentally determined enhancement factors of double-resonance structures are compared to those of single-resonance substrates.
Dramatic Reduction of Surface Recombination by in Situ Surface Passivation of Silicon Nanowires
Publisher: American Chemical Society (ACS)
Date: 20-05-2011
DOI: 10.1021/NL201179N
Abstract: Nanowires have unique optical properties and are considered as important building blocks for energy harvesting applications such as solar cells. However, due to their large surface-to-volume ratios, the recombination of charge carriers through surface states reduces the carrier diffusion lengths in nanowires a few orders of magnitude, often resulting in the low efficiency (a few percent or less) of nanowire-based solar cells. Reducing the recombination by surface passivation is crucial for the realization of high-performance nanosized optoelectronic devices but remains largely unexplored. Here we show that a thin layer of amorphous silicon (a-Si) coated on a single-crystalline silicon nanowire, forming a core-shell structure in situ in the vapor-liquid-solid process, reduces the surface recombination nearly 2 orders of magnitude. Under illumination of modulated light, we measure a greater than 90-fold improvement in the photosensitivity of in idual core-shell nanowires, compared to regular nanowires without shell. Simulations of the optical absorption of the nanowires indicate that the strong absorption of the a-Si shell contributes to this effect, but we conclude that the effect is mainly due to the enhanced carrier lifetime by surface passivation.
Separating Left- from Right-Circularly Polarized Light with a Dielectric Metamaterial
Publisher: OSA
Date: 2014
Polarization Splitting at Infrared Wavelengths using Silicon Nanoridges
Publisher: OSA
Date: 2014
Electrical tuning of reflectance of graphene metasurface for unpolarized long wavelength infrared light
Publisher: OSA
Date: 2018
Vividly-colored silicon metasurface based on collective electric and magnetic resonances
Publisher: IEEE
Date: 08-2015
Origin of the anapole condition as revealed by a simple expansion beyond the toroidal multipole
Publisher: American Physical Society (APS)
Date: 25-06-2018
Vertical optical antennas integrated with spiral ring gratings for large local electric field enhancement and directional radiation
Publisher: The Optical Society
Date: 09-05-2011
DOI: 10.1364/OE.19.010049
Double-Resonance Plasmon Substrates for Surface-Enhanced Raman Scattering with Enhancement at Excitation and Stokes Frequencies
Publisher: American Chemical Society (ACS)
Date: 29-04-2010
DOI: 10.1021/NN901826Q
Abstract: We report a surface-enhanced Raman scattering (SERS) substrate with plasmon resonances at both excitation and Stokes frequencies. This multilayer structure combines localized surface plasmons on the nanoparticles with surface plasmon polaritons excited on a gold film. The largest SERS enhancement factor for a gold device is measured to be 7.2 x 10(7), which is more than 2 orders of magnitude larger than that measured on a gold nanoparticle array on a glass substrate. The largest SERS enhancement for a silver device is measured to be 8.4 x 10(8).
Plasmonic quantum cascade laser antenna
Publisher: IEEE
Date: 05-2007
Light-matter interactions at the nanoscale: Challenges and opportunities
Publisher: IEEE
Date: 07-2016
Reconsidering metasurface lasers
Publisher: Springer Science and Business Media LLC
Date: 30-04-2021
Dispersion and extinction of surface plasmons in an array of gold nanoparticle chains: influence of the air/glass interface
Publisher: Optica Publishing Group
Date: 27-05-2008
DOI: 10.1364/OE.16.008570
Abstract: We investigate the dispersion relation and extinction properties of surface plasmons in an array of gold nanoparticle chains under s-polarized plane wave excitations, through experiment and simulation. Our results reveal that the dispersion and extinction properties of gold nanoparticle chains at an air/glass interface are significantly different from those in a uniform medium. Under total internal reflection, the dispersion is much larger than that above total internal reflection and 100% extinction can be reached. We show that the large dispersion under total internal reflection can be explained by dipole fields and coupling at the air/glass interface.
Mid- to long-wave infrared computational spectroscopy using a subwavelength coaxial aperture array
Publisher: Springer Science and Business Media LLC
Date: 19-09-2019
DOI: 10.1038/S41598-019-49593-0
Abstract: Miniaturized spectrometers are advantageous for many applications and can be achieved by what we term the filter-array detector-array (FADA) approach. In this method, each element of an optical filter array filters the light that is transmitted to the matching element of a photodetector array. By providing the outputs of the photodetector array and the filter transmission functions to a reconstruction algorithm, the spectrum of the light illuminating the FADA device can be estimated. Here, we experimentally demonstrate an array of 101 band-pass transmission filters that span the mid- to long-wave infrared (6.2 to 14.2 μm). Each filter comprises a sub-wavelength array of coaxial apertures in a gold film. As a proof-of-principle demonstration of the FADA approach, we use a Fourier transform infrared (FTIR) microscope to record the optical power transmitted through each filter. We provide this information, along with the transmission spectra of the filters, to a recursive least squares (RLS) algorithm that estimates the incident spectrum. We reconstruct the spectrum of the infrared light source of our FTIR and the transmission spectra of three polymer-type materials: polyethylene, cellophane and polyvinyl chloride. Reconstructed spectra are in very good agreement with those obtained via direct measurement by our FTIR system.
Connecting R with D3 for dynamic graphics, to explore multivariate data with tours
Publisher: The R Foundation
Date: 2019
DOI: 10.32614/RJ-2019-002
Optical Manipulation with Planar Silicon Microring Resonators
Publisher: American Chemical Society (ACS)
Date: 14-06-2010
DOI: 10.1021/NL100501D
Abstract: We demonstrate optically trapping of microparticles on silicon microring resonators. Once trapped on a microring, a particle can be confined in an optical potential with a depth of 25 k(B)T over the entire microring's circumference. The particles are propelled around the microring at hundreds of micrometers per second, producing periodic revolutions at a few hertz. We anticipate that the increased force and highly accurate positioning obtainable with this system will lead to various nanomanipulation applications.
Multicolor detour phase holograms based on an Al plasmonic color filter
Publisher: Optica Publishing Group
Date: 06-01-2023
DOI: 10.1364/OE.480812
Abstract: The remarkable advances in nanofabrication that have occurred over the last decade present opportunities for the realization of new types of holograms. In this work, for the first time to the best of our knowledge, a method for phase multicolor holograms based on nanohole arrays is described. The nanoholes are in an aluminum film that is interposed between the glass substrate and a silicon dioxide layer. The nanoholes serve as color filters for blue, green, and red wavelengths and provide the necessary phase distribution via the detour phase method. Our nanohole arrays are optimized to maximize the transmission efficiency of the red, green, and blue channels and to minimize the cross-talk between them. We design two multicolor holograms based on these filters and simulate their performance. The results show good fidelity to the desired holographic images. The proposed structure has the advantages of being very compact, of requiring only a simple fabrication method with one lithography step, and of employing materials (aluminum and silicon dioxide) that are compatible with standard CMOS technology.
Co- and cross-flow extensions in an elliptical optical trap
Publisher: American Physical Society (APS)
Date: 28-04-2009
Experimental characterization of dispersion in plasmonic nanostripes for integrated DNA sensing
Publisher: SPIE
Date: 11-02-2010
DOI: 10.1117/12.842797
Quantum mechanical effects in plasmonic structures with subnanometre gaps
Publisher: Springer Science and Business Media LLC
Date: 03-06-2016
DOI: 10.1038/NCOMMS11495
Abstract: Metallic structures with nanogap features have proven highly effective as building blocks for plasmonic systems, as they can provide a wide tuning range of operating frequencies and large near-field enhancements. Recent work has shown that quantum mechanical effects such as electron tunnelling and nonlocal screening become important as the gap distances approach the subnanometre length-scale. Such quantum effects challenge the classical picture of nanogap plasmons and have stimulated a number of theoretical and experimental studies. This review outlines the findings of many groups into quantum mechanical effects in nanogap plasmons, and discusses outstanding challenges and future directions.
Vertical Ge-Si Nanowires with Suspended Graphene Top Contacts as Dynamically Tunable Multispectral Photodetectors
Publisher: American Chemical Society (ACS)
Date: 05-02-2019
Visible to Short-Wave Infrared Photodetectors Based on ZrGeTe4van der Waals Materials
Publisher: American Chemical Society (ACS)
Date: 15-09-2021
Plasmonic Quantum Cascade Laser Antenna
Publisher: IEEE
Date: 05-2007
Plasmonic laser antenna
Publisher: AIP Publishing
Date: 28-08-2006
DOI: 10.1063/1.2339286
Abstract: The authors have demonstrated a surface plasmon device composed of a resonant optical antenna integrated on the facet of a commercial diode laser, termed a plasmonic laser antenna. This device generates enhanced and spatially confined optical near fields. Spot sizes of a few tens of nanometers have been measured at a wavelength ∼0.8μm. This device can be implemented in a wide variety of semiconductor lasers emitting in spectral regions ranging from the visible to the far infrared, including quantum cascade lasers. It is potentially useful in many applications including near-field optical microscopes, optical data storage, and heat-assisted magnetic recording.
Trapping and rotating nanoparticles using a plasmonic nano-tweezer with an integrated heat sink
Publisher: Springer Science and Business Media LLC
Date: 13-09-2011
DOI: 10.1038/NCOMMS1480
Abstract: Although optical tweezers based on far-fields have proven highly successful for manipulating objects larger than the wavelength of light, they face difficulties at the nanoscale because of the diffraction-limited focused spot size. This has motivated interest in trapping particles with plasmonic nanostructures, as they enable intense fields confined to sub-wavelength dimensions. A fundamental issue with plasmonics, however, is Ohmic loss, which results in the water, in which the trapping is performed, being heated and to thermal convection. Here we demonstrate the trapping and rotation of nanoparticles using a template-stripped plasmonic nanopillar incorporating a heat sink. Our simulations predict an ~100-fold reduction in heating compared with previous designs. We further demonstrate the stable trapping of polystyrene particles, as small as 110 nm in diameter, which can be rotated around the nanopillar actively, by manual rotation of the incident linear polarization, or passively, using circularly polarized illumination.
Strongly enhanced minority lifetimes in single silicon nanowires by surface passivation
Publisher: IEEE
Date: 06-2011
Collimation of Raman scattering with plasmonic structures
Publisher: OSA
Date: 2012
Compact Chemical Identifier Based on Plasmonic Metasurface Integrated with Microbolometer Array
Publisher: Wiley
Date: 24-01-2022
Abstract: The identification of chemicals from their mid‐infrared spectra has applications that include industrial production of chemicals, food production, pharmaceutical manufacturing, and environmental monitoring. This is generally done using laboratory benchtop tools, such as the Fourier transform infrared spectrometer. Although such systems offer high performance, alternative platforms offering reduced size, weight, and cost can enable a host of new applications, e.g. in consumer personal electronics. Here a compact microspectrometer platform for chemical identification, comprising a mid‐infrared metasurface integrated with a lightweight (≈1 g) and very small (≈1 cm 3 ) microbolometer‐based thermal camera is experimentally demonstrated. A machine learning algorithm is trained to analyze the microspectrometer output and classify chemicals based on their mid‐infrared fingerprints. High accuracy identification of four liquid chemicals, concentration quantification of ethyl lactate in cyclohexane down to subpercentage levels, and the classification of food and drug s les is demonstrated.
Experimental study of the interaction between localized and propagating surface plasmons
Publisher: Optica Publishing Group
Date: 22-01-2009
DOI: 10.1364/OL.34.000244
Abstract: The interaction between localized and propagating surface plasmons is investigated in a structure consisting of a two-dimensional periodic gold nanoparticle array, an SiO2 spacer, and a gold film. The resonance wavelengths of the two types of surface plasmons supported by the structure are tailored by changing the gold nanoparticle size and the array period. An anticrossing of the resonance positions is observed in the reflection spectra, demonstrating the strong coupling between localized and propagating surface plasmons.
Experimental demonstration of infrared spectral reconstruction using plasmonic metasurfaces
Publisher: The Optical Society
Date: 13-09-2018
DOI: 10.1364/OL.43.004481
Exciton-polariton emission from organic semiconductor optical waveguides
Publisher: American Physical Society (APS)
Date: 14-10-2011
High throughput multichannel fluorescence microscopy with microlens arrays
Publisher: The Optical Society
Date: 18-07-2014
DOI: 10.1364/OE.22.018101
Plasmonic Laser Antennas and Related Devices
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
Trapping-Assisted Sensing of Particles and Proteins Using On-Chip Optical Microcavities
Publisher: American Chemical Society (ACS)
Date: 22-01-2013
DOI: 10.1021/NN305826J
Abstract: An improved ability to sense particles and biological molecules is crucial for continued progress in applications ranging from medical diagnostics to environmental monitoring to basic research. Impressive electronic and photonic devices have been developed to this end. However, several drawbacks exist. The sensing of molecules is almost exclusively performed via their binding to a functionalized device surface. This means that the devices are seldom reusable, that their functionalization needs to be decided before use, and that they face the diffusion bottleneck. The latter challenge also applies to particle detection using photonic devices. Here, we demonstrate particle sensing using optical forces to trap and align them on waveguide-coupled silicon microcavities. A second probe laser detects the trapped particles by measuring the microcavity resonance shift. We also apply this platform to quantitatively sense green fluorescent proteins by detecting the size distribution of clusters of antibody-coated particles bound by the proteins.
Mid-Infrared Computational Spectroscopy with an Electrically-Tunable Graphene Metasurface
Publisher: OSA
Date: 2019
Nondestructive film thickness measurement using atomic force microscopy at ultrasonic frequencies
Publisher: SPIE
Date: 02-11-2000
DOI: 10.1117/12.405835
Multispectral imaging with vertical silicon nanowires
Publisher: Springer Science and Business Media LLC
Date: 19-08-2013
DOI: 10.1038/SREP02460
Near-field imaging of quantum cascade laser transverse modes
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.013227
Abstract: We report near field imaging of the transverse lasing modes of quantum cascade lasers. A mid-infrared apertureless near-field scanning optical microscope was used to characterize the modes on the laser facet. A very stable mode pattern corresponding to a TM(00) mode was observed as function of increasing driving current for a narrow active region quantum cascade laser. Higher order modes were observed for devices with a larger active region width-to-wavelength ratio operated in pulsed mode close to threshold. A theoretical model is proposed to explain why specific transverse modes are preferred close to threshold. The model is in good agreement with the experimental results.
Plasmonic wave plate based on subwavelength nanoslits
Publisher: The Optical Society
Date: 24-06-2011
DOI: 10.1364/OL.36.002498
Silicon photodetectors integrated with vertical silicon nitride waveguides as image sensor pixels: Fabrication and characterization
Publisher: American Vacuum Society
Date: 17-03-2014
DOI: 10.1116/1.4868627
Abstract: The current trend toward image sensors with ever-increasing pixel counts is prompting continual reductions in pixel area, leading to significant cross-talk and efficiency challenges. The realization of image sensor pixels containing waveguides presents a means for addressing these issues. The fabrication of such pixels is however not straightforward. Conventional waveguides employed in integrated optics are horizontal, but waveguides needed for the proposed sensor must be vertical and integrated with photodetectors. Here, the authors describe a fabrication process for vertical silicon nitride waveguides integrated with silicon photodetectors. The authors describe the etching, deposition, and planarization techniques that enable the formation of silicon nitride waveguides embedded in silicon dioxide. They also describe a fabrication process for silicon photodetectors, including a means for ensuring that their photosensitive areas have sizes consistent with those of photodetectors employed in conventional image sensors. In addition, the authors perform optical and electrical characterization of the fabricated devices. The results demonstrate the ability of the fabricated waveguides to guide light onto the photodetectors with high efficiency.
Vertically Stacked Silicon Nanowire Photodetectors for Spectral Reconstruction
Publisher: OSA
Date: 2019
Arthropod eye-inspired digital camera with unique imaging characteristics
Publisher: SPIE
Date: 04-06-2014
DOI: 10.1117/12.2050820
Polarization modulation of an optical trap's spring constant
Publisher: SPIE
Date: 28-08-2008
DOI: 10.1117/12.793428
Algorithmic Spectral Reconstruction Using Angularly Tuned Zero-Contrast Gratings
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C10E_3
Abstract: We experimentally demonstrate the algorithmic reconstruction of the infrared transmission spectrum of a polymer using a zero-contrast waveguide-grating metasurface as a filter. By changing the metasurface angle, a variety of filter functions are obtained. © 2020 The Author(s)
Controlling the Light Absorption in a Photodetector Via Nanowire Waveguide Resonances for Multispectral and Color Imaging
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2018
Plasmonics: Quantum on the Angstrom Scale, as Observed by Surface-enhanced Raman Scattering
Publisher: OSA
Date: 2014
Strong coupling between excitons in J-aggregates and waveguide modes in thin polymer films
Publisher: AIP Publishing
Date: 27-06-2011
DOI: 10.1063/1.3604014
Abstract: We observe a large room temperature Rabi splitting for the transverse electric (190 meV) and transverse magnetic (125 meV) waveguide modes of a thin polymer film doped with J-aggregating dye, indicating strong coupling between propagating light modes and localized molecular excitons. We show that the difference in the measured splitting results from the different field distribution of the cross polarized modes. Numerical simulations indicate that the exciton-waveguide modes are as strongly coupled as exciton-surface plasmon polaritons supported by the same system.
Plasmonic Trapping with a Gold Nanopillar
Publisher: Wiley
Date: 23-05-2012
Abstract: An improved ability to manipulate nanoscale objects could spur the field of nanotechnology. Optical tweezers offer the compelling advantage that manipulation is performed in a non-invasive manner. However, traditional optical tweezers based on laser beams focused with microscope lenses face limitations due to the diffraction limit, which states that conventional lenses can focus light to spots no smaller than roughly half the wavelength. This has motivated recent work on optical trapping based on the sub-wavelength field distributions of surface plasmon nanostructures. This approach offers the benefits of higher precision and resolution, and the possibility of large-scale parallelization. Herein, we discuss the fundamentals of optical manipulation using surface plasmon resonance structures. We describe two important issues in plasmonic trapping: optical design and thermal management strategies. Finally, we describe a surface plasmon nanostructure, consisting of a gold nanopillar that takes these issues into consideration. It is shown to enable the trapping and rotation (manual and passive) of nanoparticles. Methods by which this concept can be extended are discussed.
Silicon microspectrometer chip based on nanostructured fishnet photodetectors with tailored responsivities and machine learning
Publisher: The Optical Society
Date: 10-09-2019
Multicolored Vertical Silicon Nanowires
Publisher: American Chemical Society (ACS)
Date: 17-03-2011
DOI: 10.1021/NL200201B
Abstract: We demonstrate that vertical silicon nanowires take on a surprising variety of colors covering the entire visible spectrum, in marked contrast to the gray color of bulk silicon. This effect is readily observable by bright-field microscopy, or even to the naked eye. The reflection spectra of the nanowires each show a dip whose position depends on the nanowire radii. We compare the experimental data to the results of finite difference time domain simulations to elucidate the physical mechanisms behind the phenomena we observe. The nanowires are fabricated as arrays, but the vivid colors arise not from scattering or diffractive effects of the array, but from the guided mode properties of the in idual nanowires. Each nanowire can thus define its own color, allowing for complex spatial patterning. We anticipate that the color filter effect we demonstrate could be employed in nanoscale image sensor devices.
Vertically Stacked Photodetector Devices Containing Silicon Nanowires with Engineered Absorption Spectra
Publisher: American Chemical Society (ACS)
Date: 03-04-2015
DOI: 10.1021/PH500463R
Design of nanoslotted photonic crystal waveguide cavities for single nanoparticle trapping and detection
Publisher: Optica Publishing Group
Date: 30-10-2009
DOI: 10.1364/OL.34.003451
Plasmonic Mid-Infrared Filter Array-Detector Array Chemical Classifier Based on Machine Learning
Publisher: American Chemical Society (ACS)
Date: 02-02-2021
Algorithmic approach for designing plasmonic nanotweezers
Publisher: The Optical Society
Date: 23-10-2019
DOI: 10.1364/OL.44.005250
Scanning microscopy using a short-focal-length Fresnel zone plate
Publisher: Optica Publishing Group
Date: 14-07-2009
DOI: 10.1364/OL.34.002228
All-dielectric nanotweezers for trapping and observation of a single quantum dot
Publisher: The Optical Society
Date: 04-02-2019
DOI: 10.1364/OE.27.004034
Experimental measurement of surface plasmon resonance of pyramidal metal nanoparticle tips
Publisher: SPIE
Date: 28-08-2008
DOI: 10.1117/12.794740
Analysis of surface plasmon waves in metaldielectric- metal structures and the criterion for negative refractive index
Publisher: Optica Publishing Group
Date: 15-01-2009
DOI: 10.1364/OE.17.001136
Abstract: Surface plasmon waves in metal-dielectric-metal structures have been theoretically examined. Because of the existence of evanescent waves that can have comparable or smaller decay rates than the propagating waves, the sign of dispersion does not necessarily indicate the sign of effective refractive index for these structures. By using the direction of energy decay to distinguish the sign of index, we have obtained different results and insights from previous reports. We also propose an approach to increase the bandwidth and decrease the loss of negative index surface Plasmon propagation in the MDM structure, by simply changing the properties of its dielectric layer.
Filter-Free Image Sensor Pixels Comprising Silicon Nanowires with Selective Color Absorption
Publisher: American Chemical Society (ACS)
Date: 06-03-2014
DOI: 10.1021/NL404379W
Abstract: The organic dye filters of conventional color image sensors achieve the red/green/blue response needed for color imaging, but have disadvantages related to durability, low absorption coefficient, and fabrication complexity. Here, we report a new paradigm for color imaging based on all-silicon nanowire devices and no filters. We fabricate pixels consisting of vertical silicon nanowires with integrated photodetectors, demonstrate that their spectral sensitivities are governed by nanowire radius, and perform color imaging. Our approach is conceptually different from filter-based methods, as absorbed light is converted to photocurrent, ultimately presenting the opportunity for very high photon efficiency.
Tuning the Visible-to-Infrared Reflectance Spectra of Arrays of Vertical Ge Nanowires
Publisher: OSA
Date: 2014
Metasurfaces 2.0: Laser-integrated and with vector field control
Publisher: AIP Publishing
Date: 08-2021
DOI: 10.1063/5.0057904
Microfabricated solid immersion lens with metal aperture
Publisher: IEEE
Date: 2000
Micromachined silicon nitride solid immersion lenses
Publisher: IEEE
Date: 2000
High-Resolution Mid-Infrared Spectral Reconstruction using a Subwavelength Coaxial Aperture Array
Publisher: OSA
Date: 2019
Mid-infrared spectral reconstruction with dielectric metasurfaces and dictionary learning
Publisher: Optica Publishing Group
Date: 05-05-2022
DOI: 10.1364/OL.448858
Abstract: Mid-infrared (MIR) spectroscopy has numerous industrial applications and is usually performed with Fourier-transform infrared (FTIR) spectrometers. While these work well for many purposes, there is currently much interest in alternative approaches that are smaller and lighter, i.e., MIR microspectrometers. Here we investigate all-dielectric metasurfaces as spectral filters for MIR microspectrometers. Two metasurface types are studied. For the first, we design, fabricate, and test a metasurface with a narrow and angularly tunable transmission stop band. We use it to reconstruct the transmission spectra of various materials. The second metasurface, investigated theoretically, possesses narrow passband features via symmetry-protected bound states in the continuum.
Nanoparticle manipulation using a plasmonic nano-tweezer with an integrated heat sink
Publisher: OSA
Date: 2011
Waveguide exciton polaritons in polymer optical waveguides doped with J-aggregating dyes: generation, emission and control
Publisher: SPIE
Date: 09-02-2012
DOI: 10.1117/12.910118
Bright Mid-Wave Infrared Resonant-Cavity Light-Emitting Diodes Based on Black Phosphorus
Publisher: American Chemical Society (ACS)
Date: 24-01-2022
DOI: 10.1021/ACS.NANOLETT.1C04557
Abstract: The mid-wave infrared (MWIR) wavelength range plays a central role in a variety of applications, including optical gas sensing, industrial process control, spectroscopy, and infrared (IR) countermeasures. Among the MWIR light sources, light-emitting diodes (LEDs) have the advantages of simple design, room-temperature operation, and low cost. Owing to the low Auger recombination at high carrier densities and direct bandgap of black phosphorus (bP), it can serve as a high quantum efficiency emitting layer in LEDs. In this work, we demonstrate bP-LEDs exhibiting high external quantum efficiencies and wall-plug efficiencies of up to 4.43 and 1.78%, respectively. This is achieved by integrating the device with an Al
Mid‐Wave Infrared Polarization‐Independent Graphene Photoconductor with Integrated Plasmonic Nanoantennas Operating at Room Temperature
Publisher: Wiley
Date: 20-01-2021
Delivering Nanoparticles and Molecules to the Same Spot with a Superhydrophobic Bulls-eye for Surface-enhanced Raman Scattering
Publisher: OSA
Date: 2014
Semiconductor lasers with integrated metasurfaces for direct output beam modulation, enabled by innovative fabrication methods
Publisher: Walter de Gruyter GmbH
Date: 12-01-2023
Abstract: Semiconductor lasers play critical roles in many different systems, ranging from optical communications to absorption spectroscopy for environmental monitoring. Despite numerous applications, many semiconductor lasers have problems such as significant beam ergence and polarization instability. External optical elements like objective lenses and polarizers are usually needed to address these issues. This Review will discuss how these issues have recently been dealt with by instead integrating metasurfaces into semiconductor lasers. This necessitates the development of innovative fabrication methods these will also be the topic of this Review. Metasurfaces can be integrated on the emitting facet of a laser. This can help select the lasing mode or can be used just to modify the output beam properties without affecting the modes. They can also be integrated monolithically with lasers through waveguides, or work in an external cavity configuration. These integrated devices provide novel optical functions, such as direct orbital angular momentum (OAM) mode generation, wavelength tuning and holographic pattern generation. We hope this Review will help extend the use of metasurface-integrated semiconductor lasers to scientific and industrial systems that employ lasers.
Tandem Photodetectors Containing Silicon Nanowires with Selective Spectral Absorption
Publisher: OSA
Date: 2015
Direct observation of optical trapping of a single quantum dot with an all-silicon nanoantenna
Publisher: OSA
Date: 2017
Evaporated SexTe1‐x Thin Films with Tunable Bandgaps for Short‐Wave Infrared Photodetectors
Publisher: Wiley
Date: 09-08-2020
Nanostructured Fishnet Silicon Photodetector Pixels as a Fully-Contained Microspectrometer Chip
Publisher: OSA
Date: 2018
Microfabricated water immersion zone plate optical tweezer
Publisher: AIP Publishing
Date: 18-02-2008
DOI: 10.1063/1.2837538
Abstract: We demonstrate the trapping of beads in water with a microfabricated Fresnel zone plate. Beads are loaded onto the microfabricated optical traps using conventional optical tweezers and fluorescence microscopy is used to track bead position. Analysis of the bead position as a function of time is used to determine trapping stiffness. We present experiments showing the three-dimensional trapping of 2μm diameter beads with trapping stiffnesses that are comparable to conventional optical tweezers when the zone plate efficiency is taken into account.
Field enhancement and gap-dependent resonance in a system of two opposing tip-to-tip Au nanotriangles
Publisher: American Physical Society (APS)
Date: 07-10-2005
Fabrication techniques of high aspect ratio vertical lightpipes using a dielectric photomask
Publisher: SPIE
Date: 11-02-2010
DOI: 10.1117/12.840725
Mid-infrared Magnetic Mirror Based on a Hybrid Metal/Dielectric Metasurface
Publisher: OSA
Date: 2018
Microfabricated silicon solid immersion lens
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2001
DOI: 10.1109/84.946806
Nearfield optics with solid immersion lenses and sharp metal probes
Publisher: IEEE
Date: 2001
Plasmonic quantum cascade laser antenna
Publisher: AIP Publishing
Date: 22-10-2007
DOI: 10.1063/1.2801551
Abstract: We report a plasmonic quantum cascade laser antenna that confines coherent midinfrared radiation well below the diffraction limit. The antenna was fabricated on the facet of a midinfrared quantum cascade laser and consists of a pair of gold nanorods separated by a gap. The antenna near field was characterized by an apertureless near-field scanning optical microscope field confinement of about 100 and 70nm, limited by the gap size, was demonstrated at wavelengths of 7.0 and 5.3μm, respectively. This device may find important applications in midinfrared subwavelength chemical and biological imaging and spectroscopy.
Geometric Phase Metasurface Hologram for Optical Tractor Beam Generation
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_QELS.2020.FTU4Q.1
Abstract: We present a geometric phase silicon metasurface hologram design intended to produce a non-diffracting solenoid beam. Such optical beams have been shown to exert long range retrograde (i.e. toward source) optical forces on light-scattering particles.
Digital cameras with designs inspired by the arthropod eye
Publisher: Springer Science and Business Media LLC
Date: 05-2013
DOI: 10.1038/NATURE12083
Abstract: In arthropods, evolution has created a remarkably sophisticated class of imaging systems, with a wide-angle field of view, low aberrations, high acuity to motion and an infinite depth of field. A challenge in building digital cameras with the hemispherical, compound apposition layouts of arthropod eyes is that essential design requirements cannot be met with existing planar sensor technologies or conventional optics. Here we present materials, mechanics and integration schemes that afford scalable pathways to working, arthropod-inspired cameras with nearly full hemispherical shapes (about 160 degrees). Their surfaces are densely populated by imaging elements (artificial ommatidia), which are comparable in number (180) to those of the eyes of fire ants (Solenopsis fugax) and bark beetles (Hylastes nigrinus). The devices combine elastomeric compound optical elements with deformable arrays of thin silicon photodetectors into integrated sheets that can be elastically transformed from the planar geometries in which they are fabricated to hemispherical shapes for integration into apposition cameras. Our imaging results and quantitative ray-tracing-based simulations illustrate key features of operation. These general strategies seem to be applicable to other compound eye devices, such as those inspired by moths and lacewings (refracting superposition eyes), lobster and shrimp (reflecting superposition eyes), and houseflies (neural superposition eyes).
Vertical waveguides integrated with silicon photodetectors: Towards high efficiency and low cross-talk image sensors
Publisher: AIP Publishing
Date: 23-01-2012
DOI: 10.1063/1.3678019
Abstract: We describe the experimental realization of vertical silicon nitride waveguides integrated with silicon photodetectors. The waveguides are embedded in a silicon dioxide layer. Scanning photocurrent microscopy is performed on a device containing a waveguide, and on a device containing the silicon dioxide layer, but without the waveguide. The results confirm the waveguide’s ability to guide light onto the photodetector with high efficiency. We anticipate that the use of these structures in image sensors, with one waveguide per pixel, would greatly improve efficiency and significantly reduce inter-pixel crosstalk.
Erratum: Direct particle tracking observation and brownian dynamics simulations of a single nanoparticle optically trapped by a plasmonic nanoaperture (ACS Photonics (2018) 5:7 (2850-2859) DOI: 10.1021/acsphotonics.8b00176)
Publisher: American Chemical Society (ACS)
Date: 26-03-2020
Germanium Nanowires as Spectrally-selective Photodetectors in the Visible-to-Infrared
Publisher: OSA
Date: 2015
Elliptical silicon nanowire photodetectors for polarization-resolved imaging
Publisher: The Optical Society
Date: 10-03-2015
DOI: 10.1364/OE.23.007209
Mid- to long-wave infrared computational spectroscopy with a graphene metasurface modulator
Publisher: Springer Science and Business Media LLC
Date: 25-03-2020
DOI: 10.1038/S41598-020-61998-W
Abstract: In recent years there has been much interest concerning the development of modulators in the mid- to long-wave infrared, based on emerging materials such as graphene. These have been frequently pursued for optical communications, though also for other specialized applications such as infrared scene projectors. Here we investigate a new application for graphene modulators in the mid- to long-wave infrared. We demonstrate, for the first time, computational spectroscopy in the mid- to long-wave infrared using a graphene-based metasurface modulator. Furthermore, our metasurface device operates at low gate voltage. To demonstrate computational spectroscopy, we provide our algorithm with the measured reflection spectra of the modulator at different gate voltages. We also provide it with the measured reflected light power as a function of the gate voltage. The algorithm then estimates the input spectrum. We show that the reconstructed spectrum is in good agreement with that measured directly by a Fourier transform infrared spectrometer, with a normalized mean-absolute-error (NMAE) of 0.021.
The Acoustophotoelectric Effect: Efficient Phonon–Photon–Electron Coupling in Zero-Voltage-Biased 2D SnS2 for Broad-Band Photodetection
Publisher: American Chemical Society (ACS)
Date: 27-09-2023
Controlled optical trapping and transport of a single 100 nm particle across an array of silicon nanoantennas
Publisher: OSA
Date: 2018
An integrated microparticle sorting system based on near-field optical forces and a structural perturbation
Publisher: The Optical Society
Date: 30-01-2012
DOI: 10.1364/OE.20.003367
Bio-inspired hemispherical compound eye camera
Publisher: SPIE
Date: 03-03-2014
DOI: 10.1117/12.2041112
Stimulated Emission of Cylindrical Vector Beams from a Dye-Doped Slab Waveguide
Publisher: OSA
Date: 2012
Amplitude- and Phase-Resolved Near-Field Mapping of Infrared Antenna Modes by Transmission-Mode Scattering-Type Near-Field Microscopy
Publisher: American Chemical Society (ACS)
Date: 12-01-2010
DOI: 10.1021/JP909252Z
Lithographically Fabricated Optical Antennas with Gaps Well Below 10 nm
Publisher: Wiley
Date: 17-05-2011
Optical antennas integrated with concentric ring gratings: electric field enhancement and directional radiation
Publisher: The Optical Society
Date: 20-01-2011
DOI: 10.1364/OE.19.002148
Observation of visible-wavelength electric and magnetic resonances on silicon nanorods
Publisher: OSA
Date: 2014
Differential near-field scanning optical microscopy
Publisher: IEEE
Date: 05-2007
High Directivity Optical Antenna Substrates for Surface Enhanced Raman Scattering
Publisher: Wiley
Date: 03-07-2012
Abstract: A two-dimensional array of gold optical antennas integrated with a one-dimensional array of gold strips and mirrors is introduced and fabricated. The experimental results show that this design achieves average surface-enhanced Raman scattering (SERS) enhancement factors as high as 1.2 × 10(10) , which is more than two orders of magnitude larger than optical antennas without the gold strips and gold mirror.
Experimental measurement of the dispersion relations of gold nanoparticle chains
Publisher: IEEE
Date: 05-2007
Trapping nanoparticles with plasmonic and photonic nanostructures
Publisher: OSA
Date: 2017
Fabrication of high-aspect-ratio lightpipes
Publisher: American Vacuum Society
Date: 05-2011
DOI: 10.1116/1.3589809
Abstract: The authors report the development of two fabrication processes for creating high-aspect-ratio lightpipes in a 10 μm thick SiO2 layer, with smooth, uniform, and straight vertical sidewalls. Both processes require only standard optical lithography, without the need for advanced electron beam or deep-UV lithography. One process employs a dielectric etch mask and the other uses a negative photoresist as the etch mask. The experiments show that the CF4-based reaction gases are best for deep etching with high selectivity and etch rate. Trenches with diameters or width of 1.5 μm are demonstrated, with an aspect ratio of 7.2:1 and a sidewall angle of 87.4°. The authors also achieve cylindrical lightpipes with an aspect ratio of 3.8:1 and a sidewall angle of 89.5°. They anticipate that these high-aspect-ratio lightpipe structures would be useful for complementary metal-oxide semiconductor image sensors, where they would increase the efficiency of light collection, and reduce interpixel cross-talk.
Charge and current reservoirs for electric and magnetic field enhancement
Publisher: Optica Publishing Group
Date: 04-05-2010
DOI: 10.1364/OE.18.010388
Genetic optimization of mid-infrared filters for a machine learning chemical classifier
Publisher: Optica Publishing Group
Date: 11-05-2022
DOI: 10.1364/OE.459067
Abstract: Miniaturized mid-infrared spectrometers present opportunities for applications that range from health monitoring to agriculture. One approach combines arrays of spectral filters with infrared photodetectors, called filter-array detector-array (FADA) microspectrometers. A paper recently reported a FADA microspectrometer in tandem with machine learning for chemical identification. In that work, a FADA microspectrometer with 20 filters was assembled and tested. The filters were band-pass, or band-stop designs that evenly spanned the microspectrometer’s operating wavelength range. However, given that a machine learning classifier can be trained on an arbitrary filter basis, it is not apparent that evenly spaced filters are optimal. Here, through simulations with noise, we use a genetic algorithm to optimize six bandpass filters to best identify liquid and gaseous chemicals. We report that the classifiers trained with the optimized filter sets outperform those trained with evenly spaced filter sets and those handpicked to target the absorption bands of the chemicals investigated.
Experimental measurement of the dispersion relations of the surface plasmon modes of metal nanoparticle chains
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.017482
Abstract: The dispersion relations of the surface plasmon modes of metal nanoparticle chains are measured, and compared with theory. The theoretical model includes the effects of retardation, radiative d ing and dynamic depolarization due to the finite size of the nanoparticles. The results reveal that, in addition to one longitudinal and one transverse mode, there is a third mode, which has not been previously reported.
Adding colors to polydimethylsiloxane by embedding vertical silicon nanowires
Publisher: AIP Publishing
Date: 05-11-2012
DOI: 10.1063/1.4766944
Dispersion and Extinction of the Plasmon Mode in a Gold Nanoparticle Array at an Air/Glass Interface
Publisher: IEEE
Date: 10-2007
Quo vadis, plasmonic optical tweezers?
Publisher: Springer Science and Business Media LLC
Date: 03-04-2019
DOI: 10.1038/S41377-019-0146-X
Abstract: Conventional optical tweezers based on traditional optical microscopes are subject to the diffraction limit, making the precise trapping and manipulation of very small particles challenging. Plasmonic optical tweezers can surpass this constraint, but many potential applications would benefit from further enhanced performance and/or expanded functionalities. In this Perspective, we discuss trends in plasmonic tweezers and describe important opportunities presented by its interdisciplinary combination with other techniques in nanoscience. We furthermore highlight several open questions concerning fundamentals that are likely to be important for many potential applications.
Room Temperature Bias-Selectable, Dual-Band Infrared Detectors Based on Lead Sulfide Colloidal Quantum Dots and Black Phosphorus
Publisher: American Chemical Society (ACS)
Date: 15-06-2023
Scannable Plasmonic Trapping Using a Gold Stripe
Publisher: American Chemical Society (ACS)
Date: 17-08-2010
DOI: 10.1021/NL101653N
Abstract: Using counterpropagating surface plasmon polaritons (SPPs) on a gold stripe, we demonstrate a scannable integrated optical tweezer. We demonstrate the trapping of in idual fluorescent beads on the stripe, which supports a single quasi-transverse magnetic (TM) mode at the metal-water interface. The beads are localized to the stripe center, with a standard deviation of 51 nm transverse to the stripe, corresponding to a trap stiffness of 1.7 pN/microm. The localization along the stripe is achieved by balancing the scattering forces from the two counterpropagating SPPs excited by prism coupling. The particle position along the stripe can be controlled by varying the relative intensity of the two input beams. This work adds an important new capability to plasmonic optical tweezers, that of scanning. We anticipate that this will broaden the range of applications of plasmonic optical manipulation.
Long-Wave Infrared Photodetectors Based on 2D Platinum Diselenide atop Optical Cavity Substrates
Publisher: American Chemical Society (ACS)
Date: 22-03-2021
Visible to long-wave infrared chip-scale spectrometers based on photodetectors with tailored responsivities and multispectral filters
Publisher: Walter de Gruyter GmbH
Date: 23-06-2020
Abstract: Chip-scale microspectrometers, operational across the visible to long-wave infrared spectral region will enable many remote sensing spectroscopy applications in a variety of fields including consumer electronics, process control in manufacturing, as well as environmental and agricultural monitoring. The low weight and small device footprint of such spectrometers could allow for integration into handheld, unattended vehicles or wearable-electronics based systems. This review will focus on recent developments in nanophotonic microspectrometer designs, which fall into two design categories: (i) planar filter-arrays used in conjunction with visible or IR detector arrays and (ii) microspectrometers using filter-free detector designs with tailored responsivities, where spectral filtering and photocurrent generation occur within the same nanostructure.
High-performance silicon nanowire bipolar phototransistors
Publisher: AIP Publishing
Date: 18-07-2017
DOI: 10.1063/1.4959264
Abstract: Silicon nanowires (SiNWs) have emerged as sensitive absorbing materials for photodetection at wavelengths ranging from ultraviolet (UV) to the near infrared. Most of the reports on SiNW photodetectors are based on photoconductor, photodiode, or field-effect transistor device structures. These SiNW devices each have their own advantages and trade-offs in optical gain, response time, operating voltage, and dark current noise. Here, we report on the experimental realization of single SiNW bipolar phototransistors on silicon-on-insulator substrates. Our SiNW devices are based on bipolar transistor structures with an optically injected base region and are fabricated using CMOS-compatible processes. The experimentally measured optoelectronic characteristics of the SiNW phototransistors are in good agreement with simulation results. The SiNW phototransistors exhibit significantly enhanced response to UV and visible light, compared with typical Si p-i-n photodiodes. The near infrared responsivities of the SiNW phototransistors are comparable to those of Si avalanche photodiodes but are achieved at much lower operating voltages. Compared with other reported SiNW photodetectors as well as conventional bulk Si photodiodes and phototransistors, the SiNW phototransistors in this work demonstrate the combined advantages of high gain, high photoresponse, low dark current, and low operating voltage.
Harnessing the Interplay between Photonic Resonances and Carrier 2 Extraction for Narrowband Germanium Nanowire Photodetectors 3 Spanning the Visible to Infrared
Publisher: American Chemical Society (ACS)
Date: 27-11-2017
Coherent Coupling of Multiple Transverse Modes in Quantum Cascade Lasers
Publisher: American Physical Society (APS)
Date: 05-01-2009
Visible to Long-Wave Infrared Photodetectors based on Copper Tetracyanoquinodimethane (CuTCNQ) Crystals
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C11B_4
Abstract: We demonstrate room-temperature photodetectors at wavelengths from visible (450 nm, 532 nm) to near- (850 nm), short-wave (1550 nm), mid-wave (4.5 µm) and long-wave (8.35 µm) infrared. These are based on drop-cast Cu TCNQ crystals.
Compact, Lightweight, and Filter-Free: An All-Si Microspectrometer Chip for Visible Light Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 06-01-2022
Chromatic Plasmonic Polarizers for Active Visible Color Filtering and Polarimetry
Publisher: American Chemical Society (ACS)
Date: 20-01-2012
DOI: 10.1021/NL204257G
Abstract: Color filters are widely used in color displays, optical measurement devices, and imaging devices. Conventional color filters have usually only one fixed output color. However developing active color filters with controllable color output can lead to more compact and sophisticated color filter-based devices and applications. Recent progress in nanotechnology and new knowledge of the interaction of light with metal nanostructures allow us to capture and control light better than ever. Here we use it to fabricate active color filters, based on arrays of metallic optical nanoantennas that are tailored to interact with light at visible frequencies via excitation of localized surface plasmons. This interaction maps the polarization state of incident white light to visible color. Similarly, it converts unpolarized white light to chromatically polarized light. We experimentally demonstrate a wide range of applications including active color pixels, chromatically switchable and invisible tags, and polarization imaging based on these engineered colored metasurfaces.
Surface plasmon coupling in periodic metallic nanoparticle structures: a semi-analytical model
Publisher: Optica Publishing Group
Date: 11-08-2008
DOI: 10.1364/OE.16.013070
Abstract: We report a semi-analytical model for calculating the coupling effects between the dipolar surface plasmon nanoparticles of a periodic structure. This model involves real-valued frequencies only and is therefore applicable to periodic structures with arbitrary dipolar units and environments.
Micromachined silicon nitride solid immersion lens
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2002
Superhydrophobic bull's-eye for surface-enhanced Raman scattering
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4LC00477A
Abstract: We present a micro-patterned silicon structure that enables the preparation of a SERS substrate and pre-concentration of the analyte molecules.
Surface plasmon resonances of optical antenna atomic force microscope tips
Publisher: AIP Publishing
Date: 27-04-2009
DOI: 10.1063/1.3116145
Abstract: A method for fabricating optical antennas on atomic force microscope probes using focused ion beam modification is described. We numerically demonstrate that these optical antenna probes provide a large near field intensity enhancement when illuminated at their resonant wavelengths. We experimentally measure the plasmon resonant wavelengths of probes with various lengths. Both simulation and experiment indicate that the resonant wavelength redshifts with increasing antenna length. We anticipate that the optical antenna tips could be used for mapping the field distributions of nanophotonic devices or for high spatial resolution spectroscopy.
Liquid-Metal Synthesized Ultrathin SnS Layers for High-Performance Broadband Photodetectors
Publisher: Wiley
Date: 22-09-2020
Generation of quasi-coherent cylindrical vector beams by leaky mirrorless laser
Publisher: The Optical Society
Date: 12-12-2012
DOI: 10.1364/OE.20.028862
Separation of Electromagnetic and Chemical Contributions to Surface-Enhanced Raman Spectra on Nanoengineered Plasmonic Substrates
Publisher: American Chemical Society (ACS)
Date: 03-09-2010
DOI: 10.1021/JZ1008714
Long-wave infrared magnetic mirror based on Mie resonators on conductive substrate
Publisher: Optica Publishing Group
Date: 10-01-2020
DOI: 10.1364/OE.378940
Abstract: Metal films are often used in optoelectronic devices as mirrors and/or electrical contacts. In many such devices, however, the π-phase shift of the electric field that occurs upon reflection from a perfect electric conductor (for which a metal mirror is a reasonable approximation) is undesirable. This is because it results in the total electric field being zero at the mirror surface, which is unfavorable if one wishes for ex le to enhance absorption by a material placed there. This has motivated the development of structures that reflect light with zero phase shift, as these lead to the electric field having an anti-node (rather than node) at the surface. These structures have been denoted by a variety of terms, including magnetic mirrors, magnetic conductors, and high impedance surfaces. In this work, we experimentally demonstrate a long-wave infrared device that we term a magnetic mirror. It comprises an array of amorphous silicon cuboids on a gold film. Our measurements demonstrate a phase shift of zero and a high reflectance (of ∼90%) at a wavelength of 8.4 µm. We present the results of a multipole analysis that provides insight into the physical mechanism. Lastly, we investigate the use of our structure in a photodetector application by performing simulations of the optical absorption by monolayer graphene placed on the cuboids.
Light field moment imaging
Publisher: The Optical Society
Date: 22-07-2013
DOI: 10.1364/OL.38.002666
Optical Trapping of Nanoparticles Using All-Silicon Nanoantennas
Publisher: American Chemical Society (ACS)
Date: 06-11-2018
Light-Matter Interaction Enhancement in Anisotropic 2D Black Phosphorus via Polarization-Tailoring Nano-Optics
Publisher: American Chemical Society (ACS)
Date: 25-03-2021
Controlling the near-field oscillations of loaded plasmonic nanoantennas
Publisher: Springer Science and Business Media LLC
Date: 19-04-2009
Publisher’s Note: “Optical antennas: Resonators for local field enhancement” [J. Appl. Phys. 94, 4632 (2003)]
Publisher: AIP Publishing
Date: 02-12-2003
DOI: 10.1063/1.1626674
Generalized Method of Images and Reflective Color Generation from Ultrathin Multipole Resonators
Publisher: American Chemical Society (ACS)
Date: 30-04-2018
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