ORCID Profile
0000-0002-5339-3085
Current Organisation
Australian National University
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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 | Nonlinear Optics and Spectroscopy | Nanotechnology | Photonics and Electro-Optical Engineering (excl. Communications) | Optical And Photonic Systems | Photodetectors, Optical Sensors and Solar Cells | Electrical and Electronic Engineering | Nanophotonics | Communications Technologies | Integrated Circuits | Other Electronic Engineering | Glass | Nanotechnology | Elemental Semiconductors | Microtechnology | Materials Engineering | Organic Semiconductors | Optics And Opto-Electronic Physics
ANZSRC Socio-Economic Objective (SEO)
Integrated circuits and devices | Expanding Knowledge in the Physical Sciences | Communication equipment not elsewhere classified | Environmentally Sustainable Plant Production not elsewhere classified | Other | Data, image and text equipment | National Security | Expanding Knowledge in Technology | Ceramics, glass and industrial mineral products not elsewhere classified | Diagnostic Methods | Network Infrastructure Equipment | Integrated Circuits and Devices |
Related Links
Publications
High-Harmonic Generation from Resonant Dielectric Metasurfaces Empowered by Bound States in the Continuum
Publisher: American Chemical Society (ACS)
Date: 20-01-2022
Efficient All-Dielectric Diatomic Metasurface for Linear Polarization Generation and 1-Bit Phase Control
Publisher: American Chemical Society (ACS)
Date: 22-03-2021
Spatial Coherence Manipulation on the Disorder-Engineered Statistical Photonic Platform
Publisher: American Chemical Society (ACS)
Date: 25-07-2022
DOI: 10.1021/ACS.NANOLETT.2C02115
Abstract: Coherence, similar to litude, polarization, and phase, is a fundamental characteristic of the light fields and is dominated by the statistical optical property. Although spatial coherence is one of the pivotal optical dimensions, it has not been significantly manipulated on the photonic platform. Here, we theoretically and experimentally manipulate the spatial coherence of light fields by loading different random phase distributions onto the wavefront with a metasurface. We achieve the generation of partially coherent light with a predefined degree of coherence and continuously modulate it from coherent to incoherent by controlling the phase fluctuation ranges or the beam sizes. This design strategy can be easily extended to manipulate arbitrary phase-only special beams with the same degree of coherence. Our approach provides straightforward rules to manipulate the coherence of light fields in an extra-cavity-based manner and paves the way for further applications in ghost imaging and information transmission in turbulent media.
All-dielectric metasurfaces for simultaneously realizing polarization rotation and wavefront shaping of visible light
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR00187E
Abstract: It has been proposed that monolayer all-dielectric metasurfaces efficiently manipulate the wavefront of transmitted visible light exhibiting controllable linear polarization angles.
Polarization response of planarized optical waveguides to determine the anisotropic complex refractive index of graphene oxide thin films
Publisher: Optica Publishing Group
Date: 14-01-2022
DOI: 10.1364/AO.435309
Abstract: The polarization response of graphene oxide (GO)-coated planarized optical waveguides is used to determine the complex refractive index of GO film. GO films with thicknesses between 0.10 and 0.71 µm were coated on planarized optical waveguides. GO-coated waveguides exhibit large polarization dependent losses—and the polarization response depends strongly on the GO coating thickness. The response was used, together with finite element analysis, to determine the complex refractive index of the GO film. The complex refractive indices of GO films for both TE- and TM-polarized light at a wavelength of 1550 nm were found to be 1.71 + 0 . 09 i and 1.58 + 0 . 05 i , respectively. The uncertainties of n G O and k G O for TE-polarized light are ± 0 . 02 and ± 0 . 03 , respectively, whereas the uncertainties of n G O and k G O for TM-polarized light are ± 0 . 05 and ± 0 . 02 , respectively.
Low loss CMOS-compatible silicon nitride photonics utilizing reactive sputtered thin films
Publisher: The Optical Society
Date: 12-12-2019
DOI: 10.1364/OE.380758
Polarization-encrypted high-resolution full-color images exploiting hydrogenated amorphous silicon nanogratings
Publisher: Walter de Gruyter GmbH
Date: 28-02-2020
Abstract: As a prominent alternative to toxic dyes igments, nanostructural color pixels have garnered tremendous attention in applications related to display/imaging devices and color printings. However, current color pixels mostly offer static color responses. In relation to this, dynamic color tuning properties must be investigated in order to expand their functionalities and promote their use in the fields of encryption and anti-counterfeiting. In this study, a simple array of hydrogenated amorphous silicon nanogratings is proposed to realize polarization-encrypted full-color images via the coupling of incident light into different leaky mode resonances within the nanogratings. The proposed pixels can readily switch from vivid full colors to indistinguishable orange color by altering the incident polarization state. Hence, unlike the reported polarization-tuned color generation schemes that merely allow for the color variation of the image or require complicated designs to hide the color information, the proposed approach can encrypt arbitrary full-color images via a simple tuning of the incident polarization state. Owing to the localized leaky mode resonances supported by the nanogratings, the pixel can still implement the polarization-encrypted functionality even when it contains only four gratings, thus enabling a remarkably high resolution. The proposed simple scheme may provide a credible new pathway for accelerating the practical applications of high-resolution encryption and anti-counterfeiting.
Integration of Brillouin and passive circuits for enhanced radio-frequency photonic filtering
Publisher: AIP Publishing
Date: 10-2019
DOI: 10.1063/1.5113569
Abstract: Signal processing using on-chip nonlinear or linear optical effects has shown tremendous potential for RF photonic applications. Combining nonlinear and linear elements on the same photonic chip can further enable advanced functionality and enhanced system performance in a robust and compact form. However, the integration of nonlinear and linear optical signal processing units remains challenging due to the competing and demanding waveguide requirements, specifically the combination of high optical nonlinearity in single-pass waveguides, which is desirable for broadband signal processing with low linear loss and negligible nonlinear distortions required for linear signal processing. Here, we report the first demonstration of integrating Brillouin-active waveguides and passive ring resonators on the same integrated photonic chip, enabling an integrated microwave photonic notch filter with ultradeep stopband suppressions of & dB, a low filter passband loss of & −10 dB, flexible center frequency tuning over 15 GHz, and reconfigurable filter shape. This demonstration paves the way for implementing high-performance integrated photonic processing systems that merge complementary linear and nonlinear properties, for advanced functionality, enhanced performance, and compactness.
Inverse Design of Few-Layer Metasurfaces Empowered by the Matrix Theory of Multilayer Optics
Publisher: American Physical Society (APS)
Date: 02-02-2022
Photonic-Chip-Based Ultrafast Waveform Analysis and Optical Performance Monitoring
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2012
Nonlinear Metasurfaces Governed by Bound States in the Continuum
Publisher: American Chemical Society (ACS)
Date: 25-06-2019
Integrated microwave photonic true-time delay with interferometric delay enhancement based on Brillouin scattering and microring resonators
Publisher: Optica Publishing Group
Date: 12-11-2020
DOI: 10.1364/OE.408617
Abstract: True-time delays are important building blocks in modern radio frequency systems that can be implemented using integrated microwave photonics, enabling higher carrier frequencies, improved bandwidths, and a reduction in size, weight, and power. Stimulated Brillouin scattering (SBS) offers optically-induced continuously tunable delays and is thus ideal for applications that require programmable reconfiguration but previous approaches have been limited by large SBS gain requirements. Here, we overcome this limitation by using radio-frequency interferometry to enhance the Brillouin-induced delay applied to the optical sidebands that carry RF signals, while controlling the phase of the optical carrier with integrated silicon nitride microring resonators. We report a delay tunability over 600 ps exploiting an enhancement factor of 30, over a bandwidth of 1 GHz using less than 1 dB of Brillouin gain utilizing a photonic chip architecture based on Brillouin scattering and microring resonators.
Switchable optical trapping based on vortex-pair beams generated by a polarization-multiplexed dielectric metasurface
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NR04125E
Surface Roughness in Plasma-Etched $\hbox{As}_{\bf 2}\hbox{S}_{\bf 3}$ Films: Its Origin and Improvement
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2008
Supercontinuum generation in As2S3 waveguides fabricated without direct etching
Publisher: Optica Publishing Group
Date: 07-05-2021
DOI: 10.1364/OL.422606
Abstract: We report a supercontinuum generation (SCG) in a waveguide that spontaneously forms without an etching process during the deposition of a core material on a preformed S i O 2 substructure. The mechanism of dispersion control for this new, to the best of our knowledge, type of waveguide is analyzed by numerical simulation, which results in a design rule to achieve a target dispersion profile by adjusting the substructure geometry. SCG is experimentally demonstrated with a waveguide made of A s 2 S 3 , chalcogenide glass, which has low material absorption over the mid-IR range. A dispersion-controlled waveguide with a length of 10 mm pumped with 77 pJ pulses at a telecommunication wavelength of 1560 nm resulted in a supercontinuum that extends by more than 1.5 octaves.
Compact waveguide resonator filter for wavelength-selective reflection and rejection in silicon waveguides
Publisher: IEEE
Date: 06-2015
Metasurface doublet-integrated bidirectional grating antenna enabling enhanced wavelength-tuned beam steering
Publisher: Optica Publishing Group
Date: 22-12-2021
DOI: 10.1364/PRJ.433024
Abstract: We propose and demonstrate an optical phased-array-based bidirectional grating antenna (BDGA) in silicon nitride waveguides. The BDGA is integrated with a miniaturized all-dielectric metasurface doublet (MD) formed on a glass substrate. The BDGA device, which takes advantage of alternately feeding light to its ports in opposite directions, is presumed to effectively provide a doubled wavelength-tuned steering efficiency compared to its unidirectional counterpart. The MD, which is based on vertically cascaded convex and concave metalenses comprising circular hydrogenated amorphous silicon nanopillars, is meticulously placed atop the BDGA chip to accept and deflect a beam emanating from the emission area, thereby boosting the beam-steering performance. The manufactured BDGA could achieve an enhanced beam-steering efficiency of 0.148 deg/nm as well as a stable spectral emission response in the wavelength range of 1530–1600 nm. By deploying a fabricated MD atop the silicon photonic BDGA chip, the steering efficiency was confirmed to be boosted by a factor of ∼ 3.1 , reaching 0.461 deg/nm, as intended.
All Dielectric Transmissive Structural Multicolor Pixel Incorporating a Resonant Grating in Hydrogenated Amorphous Silicon
Publisher: Springer Science and Business Media LLC
Date: 19-10-2017
DOI: 10.1038/S41598-017-14093-6
Abstract: All dielectric transmissive type polarization-tuned structural multicolor pixels (MCPs) are proposed and demonstrated based on a one-dimensional hydrogenated amorphous silicon (a-Si:H) grating integrated with a silicon nitride waveguide. Both bandpass and bandstop transmission filtering characteristics in the visible regime, centered at the same wavelength, have been achieved by tailoring the structural parameters including the duty ratio of the grating and the thickness of the dielectric waveguide. For the three manufactured MCPs, the transmission peak exceeds 70% for the transverse electric (TE) polarization and 90% for the transverse magnetic (TM) polarization as observed at the resonance and off-resonance wavelength, respectively. The polarization-switched transmissions are attributed to the guided mode resonance initiated by the interaction of the a-Si:H grating and the dielectric waveguide. A broad color palette covering the entire visible band was successfully realized from a suite of MCPs with varying grating pitches. The proposed structural color pixels are expected to facilitate the construction of dynamic displays, image sensors, optical data storage, security tags, and so forth.
Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-01-2021
Abstract: In perovskite solar cells, the insulating nature of passivation layers needed to boost open-circuit voltage also increases the series resistance of the cell and limits the fill factor. Most improvements in power conversion efficiency have come from higher open-circuit voltage, with most fill factor improvements reported for very small-area cells. Peng et al. used a nanostructured titanium oxide electron transport layer to boost the fill factor of larger-area cells (1 square centimeter) to 0.84 by creating local regions with high conductivity. Science , this issue p. 390
Multi-Band and Frequency-Agile Chip-Based RF Photonic Filter for Ultra-Deep Interference Rejection
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-03-2022
Graphene oxide enhanced phase change tolerance of Ge2Sb2Se4Te1 for all-optical multilevel non-volatile photonics memory
Publisher: Optica Publishing Group
Date: 24-10-2022
DOI: 10.1364/JOSAB.471940
Abstract: The low optical loss of G e 2 S b 2 S e 4 T e 1 (GSST) makes it a potential functional material for all-optical multilevel photonics memory devices that can operate in the optical telecommunication wavelength band. However, the same characteristic also restricted the tolerance of GSST phase change conditions using 1550 nm as an excitation light source. This work reports on the enhancement of GSST phase change condition tolerance using a graphene oxide (GO) intermediate layer on a polymer waveguide platform. The hybrid waveguide exhibits an insertion loss of around 1 dB and a maximum readout contrast of 25% between amorphous and crystalline states, with a step increase in readout contrast of around 5% per step. This work serves as a proof of concept for the implementation of a GSST–GO hybrid structure as an optical functional material in all-optical photonics memory applications.
System-Level Performance of Chip-Based Brillouin Microwave Photonic Bandpass Filters
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2019
Virtual‐Moving Metalens Array Enabling Light‐Field Imaging with Enhanced Resolution
Publisher: Wiley
Date: 03-09-2020
Spin‐Selective Full‐Dimensional Manipulation of Optical Waves with Chiral Mirror
Publisher: Wiley
Date: 20-05-2020
High-resolution optical sampling by means of dispersionshifted highly nonlinear chalcogenide waveguides
Publisher: IEEE
Date: 07-2009
Labour market inclusion of Afghan refugees in Pakistan through Bourdieu's theory of capital
Publisher: Emerald
Date: 24-08-2021
Abstract: This article examines the labour market inclusion of documented and undocumented Afghan refugees in Pakistan using and extending Bourdieu's theory of capital. The authors draw on 22 semi-structured in-depth interviews with both documented and undocumented Afghan refugees in Pakistan. The findings show the low capital endowments of refugees. Their economic capital is shaped by low levels of financial resources, and emotional capital is shaped by their psychological distress and traumata and identity capital takes the form of negative perceptions about them. Their low capital endowments are further reduced through different forms of symbolic violence, such as ambiguous and short-term government policies, bribery and abuse by the police as well as unfair treatment by employers. However, refugees do mobilise their capital endowments to enhance their labour market position. The authors identified resilience as emotional capital, their strategic development of who they are as identity capital as well as social and cultural capital in the form of ethnic and linguistic similarities with locals in finding ways to improve their inclusion in the labour market. The authors provide insights in the dynamics that lead to and sustain the exclusion and inequalities faced by Afghan refugees in Pakistan.
Broadband High‐Efficiency Chiral Splitters and Holograms from Dielectric Nanoarc Metasurfaces
Publisher: Wiley
Date: 15-04-2019
Abstract: Simultaneous broadband and high efficiency merits of designer metasurfaces are currently attracting widespread attention in the field of nanophotonics. However, contemporary metasurfaces rarely achieve both advantages simultaneously. For the category of transmissive metadevices, plasmonic or conventional dielectric metasurfaces are viable for either broadband operation with relatively low efficiency or high efficiency at only a selection of wavelengths. To overcome this limitation, dielectric nanoarcs are proposed as a means to accomplish two advantages. Continuous nanoarcs support different electromagnetic resonant modes at localized areas for generating phase retardation. Meanwhile, the geometric nature of nanoarc curvature endows the nanoarcs with full phase coverage of 0-2π due to the Pancharatnam-Berry phase principle. Experimentally incorporated with the chiral-detour phase principle, a few compelling functionalities are demonstrated, such as chiral beamsplitting, broadband holography, and helicity-selective holography. The continuous nanoarc metasurfaces prevail over plasmonic or dielectric discretized building block strategies and the findings lead to novel designs of spin-controllable metadevices.
Chip-based SBS for image rejection in a broadband microwave photonic mixer
Publisher: Optica Publishing Group
Date: 20-01-2023
DOI: 10.1364/OE.482871
Abstract: Microwave photonics offers a promising solution for frequency converting microwave signals, however, demonstrations so far have either been bulky fibre implementations or lacked rejection of interfering image signals. Here, we demonstrate the first microwave photonic mixer with image rejection of broadband signals utilising chip-based stimulated Brillouin scattering and interferometry. We demonstrate frequency down-conversion of carrier frequencies ranging from 10 GHz-16 GHz, ultra-high image rejection for a single tone of up to 70 dB, and 100 MHz and 400 MHz wide analogue signals with 28.5 dB and 16 dB image rejection, respectively. Furthermore, we down-convert 200 Mb/s quadrature-phase-shift keying signals with an error vector magnitude as low as -9.6 dB when simultaneously present interfering image signals are suppressed by the mixer.
Flat Retroreflector Based on a Metasurface Doublet Enabling Reliable and Angle‐Tolerant Free‐Space Optical Link (Advanced Optical Materials 21/2021)
Publisher: Wiley
Date: 11-2021
Metasurface-Incorporated Optofluidic Refractive Index Sensing for Identification of Liquid Chemicals through Vision Intelligence
Publisher: American Chemical Society (ACS)
Date: 06-03-2013
Flat Retroreflector Based on a Metasurface Doublet Enabling Reliable and Angle‐Tolerant Free‐Space Optical Link
Publisher: Wiley
Date: 17-08-2021
Abstract: Facilitated by the ability to reflect radiation along its incident direction, retroreflectors have been perceived as a pivotal component for establishing reliable free‐space optical links. However, conventional retroreflectors suffer from limited integration because of their bulky size, heavy weight, and nonplanar shape. Metasurface‐based devices consisting of subwavelength nanostructures combine semiconductor manufacturing methods with nanophotonics, regarded as a new platform that outperforms geometrical optics. In this paper, a free‐space optical link exploiting a flat retroreflector (FRR) based on metasurface doublet is proposed and realized at a telecommunications wavelength of 1550 nm. The top‐ and bottom‐layer metasurfaces, comprising hydrogenated amorphous silicon nanopillars based on a meticulously tailored dielectric spacer of silica, achieve the functions of a transmissive Fourier lens and a concave mirror, respectively. The top transmissive metasurface performs a spatial Fourier transform and its inverse, while the bottom reflective metasurface imposes a spatially varying momentum for reflecting beams along their incident direction. As a proof of concept, the designed FRR, precisely created via lithographical nanofabrication, has been readily applied to forge a substantially reliable free‐space optical link, featuring an enhanced angular tolerance of ±25°. This work will initiate a positive prospect for the cooperation between metasurface‐based devices and wireless optical communications.
Third-Harmonic Generation in Photonic Topological Metasurfaces
Publisher: American Physical Society (APS)
Date: 06-09-2019
Measuring the Semantic Priming Effect Across Many Languages
Publisher: Center for Open Science
Date: 07-12-2021
Abstract: Semantic priming has been studied for nearly 50 years across various experimental manipulations and theoretical frameworks. These studies provide insight into the cognitive underpinnings of semantic representations in both healthy and clinical populations however, they have suffered from several issues including generally low s le sizes and a lack of ersity in linguistic implementations. Here, we will test the size and the variability of the semantic priming effect across ten languages by creating a large database of semantic priming values, based on an adaptive s ling procedure. Differences in response latencies between related word-pair conditions and unrelated word-pair conditions (i.e., difference score confidence interval is greater than zero) will allow quantifying evidence for semantic priming, whereas improvements in model fit with the addition of a random intercept for language will provide support for variability in semantic priming across languages.
Brillouin spectroscopy of a hybrid silicon-chalcogenide waveguide with geometrical variations
Publisher: The Optical Society
Date: 17-07-2018
DOI: 10.1364/OL.43.003493
Photosensitive chalcogenide metasurfaces supporting bound states in the continuum
Publisher: The Optical Society
Date: 05-11-2019
DOI: 10.1364/OE.27.033847
Highly uniform InGaAs/InP quantum well nanowire array-based light emitting diodes
Publisher: Elsevier BV
Date: 05-2020
Manipulation of Magnetic Dipole Emission from Eu3+ with Mie-Resonant Dielectric Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 03-01-2019
DOI: 10.1021/ACS.NANOLETT.8B04268
Abstract: Mie-resonant high-index dielectric nanoparticles and metasurfaces have been suggested as a viable platform for enhancing both electric and magnetic dipole transitions of fluorescent emitters. While the enhancement of the electric dipole transitions by such dielectric nanoparticles has been demonstrated experimentally, the case of magnetic-dipole transitions remains largely unexplored. Here, we study the enhancement of spontaneous emission of Eu
Structural color filters based on an all-dielectric metasurface exploiting silicon-rich silicon nitride nanodisks
Publisher: The Optical Society
Date: 08-01-2019
DOI: 10.1364/OE.27.000667
Twofold Polarization‐Selective All‐Dielectric Trifoci Metalens for Linearly Polarized Visible Light
Publisher: Wiley
Date: 31-07-2019
Circulator‐Free Brillouin Photonic Planar Circuit
Publisher: Wiley
Date: 18-03-2021
High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference
Publisher: Springer Science and Business Media LLC
Date: 19-07-2017
DOI: 10.1038/S41598-017-06270-4
Abstract: Integrated microwave photonics has strongly emerged as a next-generation technology to address limitations of conventional RF electronics for wireless communications. High-resolution RF signal processing still remains a challenge due to limitations in technology that offer sub-GHz spectral resolution, in particular at high carrier frequencies. In this paper, we present an on-chip high-resolution RF signal processor, capable of providing high-suppression spectral filtering, large phase shifts and ns-scale time delays. This was achieved through tailoring of the Brillouin gain profiles using Stokes and anti-Stokes resonances combined with RF interferometry on a low-loss photonic chip with strong opto-acoustic interactions. Using an optical power of mW, reconfigurable filters with a bandwidth of ~20 MHz and an extinction ratio in excess of 30 dB are synthesized. Through the concept of vector addition of RF signals we demonstrate, almost an order of magnitude lification in the phase and delay compared to devices purely based upon the slow-light effect of Brillouin scattering. This concept allows for versatile and power-efficient manipulation of the litude and phase of RF signals on a photonic chip for applications in wireless communications including software defined radios and beam forming.
Nonlinear Imaging of Nanoscale Topological Corner States
Publisher: American Chemical Society (ACS)
Date: 19-05-2021
Microwave photonic notch filter using on-chip stimulated Brillouin scattering
Publisher: IEEE
Date: 06-2013
On-chip chalcogenide microresonators with low-threshold parametric oscillation
Publisher: Optica Publishing Group
Date: 24-06-2021
DOI: 10.1364/PRJ.422435
Abstract: Chalcogenide glass (ChG) is an attractive material for highly efficient nonlinear photonics, which can cover an ultrabroadband wavelength window from the near-visible to the footprint infrared region. However, it remains a challenge to implement highly-efficient and low-threshold optical parametric processes in chip-scale ChG devices due to thermal and light-induced instabilities as well as a high-loss factor in ChG films. Here, we develop a systematic fabrication process for high-performance photonic-chip-integrated ChG devices, by which planar-integrated ChG microresonators with an intrinsic quality ( Q ) factor above 1 million are demonstrated. In particular, an in situ light-induced annealing method is introduced to overcome the longstanding instability underlying ChG film. In high- Q ChG microresonators, optical parametric oscillations with threshold power as low as 5.4 mW are demonstrated for the first time, to our best knowledge. Our results would contribute to efforts of making efficient and low-threshold optical microcombs not only in the near-infrared as presented but more promisingly in the midinfrared range.
Photosensitivity and optical nonlinearity in arsenic selenide planar waveguides [Invited]
Publisher: Optica Publishing Group
Date: 14-09-2023
DOI: 10.1364/OME.499219
Vertically integrated visible and near-infrared metasurfaces enabling an ultra-broadband and highly angle-resolved anomalous reflection
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR03059F
Abstract: Ultra-broadband and highly angle-resolved anomalous reflection with no spectrum overlapping has been achieved using vertically integrated visible and near-infrared metasurfaces.
Optical frequency comb generation using low stress reactive sputtered silicon nitride waveguides
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_AT.2020.JTH2F.17
Abstract: We demonstrate fully CMOS-compatible anomalous dispersive SiN microring resonators with an intrinsic Q factor of 6.6 × 10 5 based on reactive sputtering SiN, yielding in a 250 nm wide modulation-instability frequency comb.
Chalcogenide glasses for nonlinear photonics
Publisher: IEEE
Date: 12-2010
Optimization of sidewall roughness in silica waveguides to reduce the propagation losses
Publisher: IEEE
Date: 2001
Highly sensitive, broadband microwave frequency identification using a chip-based Brillouin optoelectronic oscillator
Publisher: The Optical Society
Date: 22-04-2019
DOI: 10.1364/OE.27.012855
Low-RF-loss and large-rejection reconfigurable Brillouin-based RF photonic bandpass filter
Publisher: Optica Publishing Group
Date: 29-06-2020
DOI: 10.1364/OL.395477
Abstract: We present a high-performance radio frequency (RF) photonic bandpass filter enabled by combining on-chip Brillouin scattering with a suppressed carrier phase modulation scheme. We achieve a low RF loss of 5 dB and a large stopband rejection of more than 40 dB, which represents a significant improvement of 20 dB to the RF passband gain and 31 dB to the RF rejection ratio over traditional modulation schemes under the same optical power consumption. We further demonstrate filter reconfigurability including multiple passbands, wide frequency (1–20 GHz), and bandwidth tunability (30–350 MHz) without compromising the RF performance.
Dielectric Polarization‐Filtering Metasurface Doublet for Trifunctional Control of Full‐Space Visible Light
Publisher: Wiley
Date: 05-02-2022
Abstract: Multilayered plasmonic metasurfaces have been previously shown to enable multifunctional control of full‐space electromagnetic waves, which are of great importance to the development of compact optical systems. While this structural configuration is practical for acquiring metasurfaces working in microwave frequency, it will inevitably become lossy and highly challenging to fabricate when entering the visible band. Here, an efficient yet facile approach to address this issue by resorting to a dielectric metasurface doublet (DMD) based on two vertically integrated polarization‐filtering meta‐atoms (PFMs) is presented. The PFMs exhibit polarization‐dependent high transmission and reflection, as well as independent and full 2π phase control characteristics, empowering the DMD to realize three distinct incidence‐direction and polarization‐triggered wavefront‐shaping functionalities, including anomalous beam deflection, light focusing, vortex beam generation, and holographic image projection as it is investigated either numerically or experimentally. The presented DMD undoubtedly holds several salient features compared with the multilayered metallic metasurfaces in aspects of design complexity, efficiency, and fabrication. Furthermore, as dielectric meta‐atoms with distinct polarization responses can be deployed to construct the DMD, it is anticipated that erse full‐space metasurfaces equipped with versatile functionalities can be demonstrated in the future, which will greatly advance the development of multifunctional meta‐optics.
Chalcogenide planar waveguides for mid-infrared applications
Publisher: IEEE
Date: 12-2014
Deep-learning-based colorimetric polarization-angle detection with metasurfaces
Publisher: Optica Publishing Group
Date: 18-02-2022
Abstract: Polarization plays a key role in both optics and photonics. Generally, the polarization states of light are measured with birefringent or dichroic optical elements paired with a power meter. Here we propose a direct polarization detection method based on colorimetric asymmetrical all-dielectric metasurfaces to obtain the polarization angles of the incident light. The independently tunable periods and diameters along the x and y axes enables double-layer nanopillars to realize high-performance dual-color palettes with arbitrary combinations under orthogonal polarization states. The polarization detection network based on residual networks is used to deeply learn the regulations between color palette variations and incident polarization angles, which can accurately recognize extremely slight polarization variations in about 1 s with an accuracy of 81.4% within 0.7° error and 99.5% within 1.4° error. Our strategy significantly improves the compactness of polarization detection, and it can be readily expanded to polarization distribution measurement and colorimetric polarization imaging on an intelligent platform.
Extreme Huygens’ Metasurfaces Based on Quasi-Bound States in the Continuum
Publisher: American Chemical Society (ACS)
Date: 30-11-2018
DOI: 10.1021/ACS.NANOLETT.8B04774
Abstract: We introduce the concept of and a generic approach to realizing extreme Huygens' metasurfaces by bridging the concepts of Huygens' conditions and optical bound states in the continuum. This novel paradigm allows the creation of Huygens' metasurfaces with quality factors that can be tuned over orders of magnitude, generating extremely dispersive phase modulation. We validate this concept with a proof-of-concept experiment at the near-infrared wavelengths, demonstrating all-dielectric Huygens' metasurfaces with different quality factors. Our study points out a practical route for controlling the radiative decay rate while maintaining the Huygens' condition, complementing existing Huygens' metasurfaces whose bandwidths are relatively broad and complicated to tune. This novel feature can provide new insight for various applications, including optical sensing, dispersion engineering and pulse shaping, tunable metasurfaces, metadevices with high spectral selectivity, and nonlinear meta-optics.
Flat telescope based on an all-dielectric metasurface doublet enabling polarization-controllable enhanced beam steering
Publisher: Walter de Gruyter GmbH
Date: 08-12-2021
Abstract: A flat telescope (FTS), which incorporates an all-dielectric metasurface doublet (MD) based on hydrogenated amorphous silicon nanoposts, is proposed and demonstrated to achieve flexibly magnified angular beam steering that is sensitive to both light polarization and deflection direction. Specifically, for transverse-electric-polarized incident beams, the MD exhibits deflection magnification factors of +5 and +2, while for transverse magnetic polarization, the beam is steered in reverse to yield magnification factors of −5 and −2 in the horizontal and vertical directions, respectively. The proposed MD comprises cascaded metalenses, which can invoke polarization-selective transmission phases. The MD which emulates a set of convex and concave lenses renders positively increased beam deflection, whereas the case corresponding to a pair of convex lenses facilitates negatively lified beam deflection. The essential phase profiles required for embodying the MD are efficiently extracted from its geometric lens counterpart. Furthermore, the implemented FTS, operating in the vicinity of a 1550 nm wavelength, can successfully enable enhanced beam steering by facilitating polarization-sensitive bidirectional deflection lifications. The proposed FTS can be applied in the development of a miniaturized light detection and ranging system, where the beam scanning range can be effectively expanded in two dimensions.
High‐Efficiency All‐Dielectric Metalenses for Mid‐Infrared Imaging
Publisher: Wiley
Date: 23-10-2017
High-conversion-gain and deep-image-rejection Brillouin chip-based photonic RF mixer
Publisher: Optica Publishing Group
Date: 30-09-2020
DOI: 10.1364/OL.400511
Abstract: In this Letter, we report a chip-based photonic radio-frequency (RF) mixer with a maximum conversion gain of − 9 d B and image rejection ratio of 50 dB for 3.2 GHz to 13.2 GHz RF frequency range. This is achieved by the combined use of optical carrier suppression modulation and on-chip stimulated Brillouin scattering. These results will stimulate future implementations of integrated photonic RF mixers in complicated electromagnetic environments.
Universal light-guiding geometry for on-chip resonators having extremely high Q-factor
Publisher: Springer Science and Business Media LLC
Date: 23-11-2020
DOI: 10.1038/S41467-020-19799-2
Abstract: By providing an effective way to leverage nonlinear phenomena in integrated devices, high-Q optical resonators have led to recent advances in on-chip photonics. However, developing fabrication processes to shape any new material into a resonator with extremely smooth surfaces on a chip has been an exceptionally challenging task. Here, we describe a universal method to implement ultra-high-Q resonators with any new material having desirable properties that can be deposited by physical vapor deposition. Using this method light-guiding cores with surface roughness on the molecular-scale are created automatically on pre-patterned substrates. Its efficacy has been verified using As 2 S 3 , a chalcogenide glass that has high-nonlinearity. The Q-factor of the As 2 S 3 resonator so-developed approached the propagation loss record achieved in chalcogenide fibers which were limited by material losses. Owing to the boosted Q-factor, lasing by stimulated Brillouin scattering has been demonstrated with 100 times lower threshold power than the previous record.
Three-step lithography to the fabrication of vertically coupled micro-ring resonators in amorphous silicon-on-insulator-corrigendum
Publisher: Shanghai Institute of Optics and Fine Mechanics
Date: 2016
Hybrid Dielectric Metasurfaces for Enhancing Second-Harmonic Generation in Chemical Vapor Deposition Grown MoS2 Monolayers
Publisher: American Chemical Society (ACS)
Date: 15-12-2021
Broadband Brillouin Phase Shifter Utilizing RF Interference: Experimental Demonstration and Theoretical Analysis
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-07-2020
Multifunctional Beam Manipulation at Telecommunication Wavelengths Enabled by an All‐Dielectric Metasurface Doublet
Publisher: Wiley
Date: 28-05-2020
On-chip stimulated Brillouin scattering
Publisher: IEEE
Date: 12-2010
Characterization of Orbital Angular Momentum Quantum States Empowered by Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 27-04-2023
Methodology for Fabrication-Tolerant Planar Directional Couplers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2022
Enhanced second-harmonic generation from two-dimensional MoSe2 on a silicon waveguide
Publisher: Springer Science and Business Media LLC
Date: 31-03-2017
DOI: 10.1038/LSA.2017.60
Hybrid Chalcogenide‐Germanosilicate Waveguides for High Performance Stimulated Brillouin Scattering Applications
Publisher: Wiley
Date: 21-08-2021
Abstract: On‐chip stimulated Brillouin scattering (SBS) in arsenic trisulfide (As 2 S 3 ) planar waveguides lead to a range of outstanding demonstrations in microwave photonics signal generation and processing. However, the lack of other integrated functionalities, high back reflections, and large in‐ and out‐fiber coupling losses in high index contrast waveguides cause a number of serious impairments and lessen the applicability of microwave photonic devices. In this report, a hybrid integration scheme is demonstrated where As 2 S 3 waveguides optimized for SBS gain are coupled with very low losses via a vertical taper to a high index contrast and versatile germanosilicate (Ge:SiO 2 ) platform. The Ge:SiO 2 waveguide is optimally mode‐matched to commercially available high numerical aperture optical fiber to achieve very low coupling losses. The structure has very low back reflection due to the adiabatic nature of the taper and negligible refractive index difference across the fiber‐chip interface. The hybrid architecture exhibits a similar Brillouin gain coefficient to its monolithic counterpart but with an improvement of dB/facet fiber‐to‐chip loss and dB reduction in facet reflectivity. The hybrid structures demonstrated will bring chalcogenide‐based chip scale SBS devices closer to practical application.
A Highly Efficient Bifunctional Dielectric Metasurface Enabling Polarization‐Tuned Focusing and Deflection for Visible Light
Publisher: Wiley
Date: 10-02-2019
Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers
Publisher: American Chemical Society (ACS)
Date: 12-06-2020
Configurable TE- and TM-Pass Graphene Oxide-Coated Waveguide Polarizer
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2020
All‐Dielectric Fiber Meta‐Tip Enabling Vortex Generation and Beam Collimation for Optical Interconnect
Publisher: Wiley
Date: 13-04-2021
Quantitative gas pressure measurement by molecular spectroscopy using chip-based supercontinuum in the mid-infrared
Publisher: Optica Publishing Group
Date: 10-10-2023
DOI: 10.1364/OE.474392
Photonic chip-based simultaneous multi-impairment monitoring for phase-modulated optical signals
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2010
Ultrahighly Saturated Structural Colors Enhanced by Multipolar-Modulated Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 11-02-2019
DOI: 10.1021/ACS.NANOLETT.8B04923
Abstract: Colors with high saturation are of prime significance for display and imaging devices. So far, structural colors arising from all-dielectric metasurfaces, particularly amorphous silicon and titanium oxide, have exceeded the gamut of standard RGB (sRGB) space. However, the excitation of higher-order modes for dielectric materials hinders the further increase of saturation. Here, to address the challenge, we propose a new design strategy of multipolar-modulated metasurfaces with multi-dielectric stacked layers to realize the deep modulation of multipolar modes. Index matching between layers can suppress the multipolar modes at nonresonant wavelength, resulting in the dramatic enhancement in the monochromaticity of reflection spectra. Ultrahigh-saturation colors ranging from 70% to 90% with full hue have been theoretically and experimentally obtained. The huge gamut space can be realized in an unprecedented way, taking up 171% sRGB space, 127% Adobe RGB space, and 57% CIE space. More interestingly, the coverage for Recommendation 2020 (Rec. 2020) space, which almost has not been successfully realized so far, can reach 90%. We anticipate that the proposed multipolar-modulated metasurfaces are promising for the enlargement of the color range for high-end and advanced display applications.
Optical frequency comb generation with low temperature reactive sputtered silicon nitride waveguides
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/1.5136270
Abstract: Integrated silicon nitride (SiN) waveguides with anomalous dispersion have the potential to bring practical nonlinear optics to mainstream photonic integrated circuits. However, high-stress and high-processing temperatures remain an obstacle to mass adoption. We report low-stress, high-confinement, dispersion-engineered SiN waveguides utilizing low temperature grown reactive sputtered thin-films. We demonstrate a microring resonator with an intrinsic quality factor of 6.6 × 105, which enabled us to generate a native free spectral range spaced frequency comb with an estimated on-chip pump power of 850 mW. Importantly, the peak processing temperature is 400 °C making this approach fully back-end compatible for hybrid integration with preprocessed CMOS substrates and temperature sensitive photonic platforms such as lithium niobate on insulator.
Optically induced antiferromagnetic order in dielectric metasurfaces with complex supercells
Publisher: Optica Publishing Group
Date: 06-04-2023
DOI: 10.1364/JOSAB.478307
Abstract: Metasurfaces are 2D planar lattices of nanoparticles that allow the manipulation of incident light properties. Because of that attribute, metasurfaces are promising candidates to replace bulky optical components. Traditionally, metasurfaces are made from a periodic arrangement of identical unit cells. However, more degrees of freedom are accessible if an increasing number of structured unit cells are combined. The present study explores a type of dielectric metasurface with complex supercells composed of Mie-resonant dielectric nanocylinders and nanoscale rings. We numerically and experimentally demonstrate the signature of an optical response that relies on the structures sustaining staggered optically induced magnetic dipole moments. The optical response is associated with an optical antiferromagnetism. The optical antiferromagnetism exploits the presence of pronounced coupling between dissimilar Mie-resonant dielectric nanoparticles. The coupling is manipulated by engineering the geometry and distance between the nanoparticles, which ultimately enhances their effective magnetic response. Our results suggest possible applications in resonant nanophotonics by broadening the modulation capabilities of metasurfaces.
Tailoring Photoluminescence from MoS2 Monolayers by Mie-Resonant Metasurfaces
Publisher: American Chemical Society (ACS)
Date: 05-03-2019
Arbitrary Manipulation of Light Intensity by Bilayer Aluminum Metasurfaces
Publisher: Wiley
Date: 02-05-2019
Applications of Highly-Nonlinear Chalcogenide Glass Devices Tailored for High-Speed All-Optical Signal Processing
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
Aberration-corrected three-dimensional positioning with a single-shot metalens array
Publisher: Optica Publishing Group
Date: 03-12-2020
Abstract: Three-dimensional (3D) positioning with the correction of imaging aberrations in the photonic platform remains challenging. Here, we combine techniques from nanophotonics and machine vision to significantly improve the imaging and positioning performance. We use a titanium dioxide metalens array operating in the visible region to realize multipole imaging and introduce a cross-correlation-based gradient descent algorithm to analyze the intensity distribution in the image plane. This corrects the monochromatic aberrations to improve the imaging quality. Analysis of the two-dimensional aberration-corrected information in the image plane enables the 3D coordinates of the object to be determined with a measured relative accuracy of 0.60%–1.31%. We also demonstrate the effectiveness of the metalens array for arbitrary incident polarization states. Our approach is single-shot, compact, aberration-corrected, polarization-insensitive, and paves the way for future integrated photonic robotic vision systems and intelligent sensing platforms that are feasible on the submillimeter scale, such as face recognition, autonomous vehicles, microrobots, and wearable intelligent devices.
Two-point coupling method to independently control coupling efficiency at different wavelengths
Publisher: Optica Publishing Group
Date: 21-12-2021
DOI: 10.1364/OL.443734
Abstract: To efficiently access light waves confined in a high-quality-factor (Q) microcavity over a wide spectral range, it is necessary to independently control coupling efficiency at different wavelengths. Here we suggest an approach to add a degree of freedom to control the coupling efficiency based on a two-point coupling geometry. By changing the phase difference between two paths connecting two coupling points, various combinations of coupling efficiencies at multiple wavelengths can be achieved. An analytic model describing the coupling property is derived and confirmed by experimental results. It is also shown that the coupling property can be modified by adjusting the effective refractive index difference between a waveguide and a resonator.
Structural Color Filters Enabled by a Dielectric Metasurface Incorporating Hydrogenated Amorphous Silicon Nanodisks
Publisher: Springer Science and Business Media LLC
Date: 31-05-2017
DOI: 10.1038/S41598-017-02911-W
Abstract: It is advantageous to construct a dielectric metasurface in silicon due to its compatibility with cost-effective, mature processes for complementary metal-oxide-semiconductor devices. However, high-quality crystalline-silicon films are difficult to grow on foreign substrates. In this work, we propose and realize highly efficient structural color filters based on a dielectric metasurface exploiting hydrogenated amorphous silicon (a-Si:H), known to be lossy in the visible regime. The metasurface is comprised of an array of a-Si:H nanodisks embedded in a polymer, providing a homogeneously planarized surface that is crucial for practical applications. The a-Si:H nanodisk element is deemed to in idually support an electric dipole (ED) and magnetic dipole (MD) resonance via Mie scattering, thereby leading to wavelength-dependent filtering characteristics. The ED and MD can be precisely identified by observing the resonant field profiles with the assistance of finite-difference time-domain simulations. The completed color filters provide a high transmission of around 90% in the off-resonance band longer than their resonant wavelengths, exhibiting vivid subtractive colors. A wide range of colors can be facilitated by tuning the resonance by adjusting the structural parameters like the period and diameter of the a-Si:H nanodisk. The proposed devices will be actively utilized to implement color displays, imaging devices, and photorealistic color printing.
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