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Conference on Nanophotonics and Micro/Nano Optics VII

作者： Li, Renjie Gu, Xiaozhe Li, Ke Li, Zhen Zhang, Zhaoyu Chinese Univ Hong Kong Sch Sci & Engn SSE Shenzhen Peoples R China Chinese Univ Hong Kong Shenzhen Key Lab Semicond Lasers Shenzhen Peoples R China

ISBN: (数字)9781510646568

ISBN: (纸本)9781510646568;9781510646551

A Deep Learning (DL) based forward modeling approach has been proposed to accurately characterize the relationship between design parameters and the optical properties of Photonic Crystal (PC) nanocavities. The demonstrated DNN model makes predictions not only for the Q factor but also for the modal volume V for the first time, granting us precise control over both properties in the design process. The experimental results show that the DNN has achieved a state-of-the-art performance in terms of prediction accuracy (up to 99.9999% for Q and 99.9890% for V) and convergence speed (i.e., orders-of-magnitude speedup). The proposed approach overcomes shortcomings of existing methods and paves the way for DL-based on-demand and data-driven optimization of PC nanocavities applicable to the rapid prototyping of nanoscale lasers and integrated photonic devices of high Q and small V.

关键词： finite-difference time-domain method Data modeling Performance modeling Optical properties Photonic crystals Statistical modeling Visualization Artificial neural networks Machine learning

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Plasmonic enhancement of light to improve the parameters of solar cells

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APPLIED NANOSCIENCE 2020年第12期10卷 4759-4766页

作者： Havryliuk, O. O. Evtukh, A. A. Pylypova, O. V. Semchuk, O. Yu. Ivanov, I. I. Zabolotnyi, V. F. Chuiko Inst Surface Chem NAS Ukraine 17 Ganeral Naumova Str UA-03164 Kiev Ukraine Lashkaryov Inst Semicond Phys NAS Ukraine 41 Pr Nauki UA-03028 Kiev Ukraine Taras Shevchenko Natl Univ Kyiv Inst High Technol 60 Volodymyrska Str UA-01033 Kiev Ukraine Vinnytsia Mykhailo Kotsiubynskyi State Pedag Univ 32 Ostrozkoho Str UA-21100 Vinnytsia Ukraine

Surface plasmon resonance (SPR) can be generated in metal nanostructures such as gold, silver, copper and aluminium, which are promising materials in the fields of optoelectronics and plasmonics. The SPR in periodic arrays has aroused great interest because of its uniform optical properties which can be applied in integrated optoelectronics device, including solar cells (SC). The optical spectra of structures with Ag nanoparticles on the surface of Si wafer were calculated. The simulation was carried out using finite-difference time-domain method (FDTD). The FDTD method is a powerful numerical algorithm for the direct solution of Maxwell's equations. As a source of radiation, a plane wave with a range of wavelengths 300-1240 nm is used. The enhancement of solar light absorption of structures with Ag nanoparticles has been demonstrated. The Localized Surface Plasmon Resonance peaks have been obtained in the wavelength range of 830-865 nm that is in good agreement with experimentally revealed one. It was shown that the period of Ag nanoparticles replacement significantly influences on the spectra and LSPR peak position. The measurement of current-voltage characteristics of solar cells with and without Ag nanoparticles demonstrated significant enhancement of short current density in case of AgNPs on SCs surface.

关键词： Optical spectra Solar cells Metal nanoparticles Plasmon Localized surface plasmon resonance finite-difference time-domain method

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Modified Photonic Band Gap Via Thermal Shrinkage of Two-Photon Polymerized Distributed Bragg Reflectors

Modified Photonic Band Gap Via Thermal Shrinkage of Two-Phot...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Yu-Shao Chen Mike P. C. Taverne C.-C. Huang Ying-Lung Daniel Ho John G. Rarity Department of Electrical and Electronic Engineering University of Bristol Bristol UK Department of Mathematics Physics & Electrical Engineering Northumbria University Newcastle upon Tyne UK Optoelectronics Research Centre University of Southampton Southampton UK

ISBN: (纸本)9798350345995

One-dimensional (1D) polymer-based photonic crystals (PhCs) in the $1.55\ \mu \mathrm{m}$ wavelength range can be easily created using a two-photon direct laser writing system. To achieve shorter period structures, we report the use of thermal shrinkage [1]–[3] of two-photon polymerized structures at elevated temperatures to eliminate unpolymerized material, leading to the uniform shrinkage of distributed Bragg reflector (DBR) structures [4] by a ratio of 2.5 to 5. Our finite difference time domain (FDTD) simulation and the angle-resolved light scattering characterisation technique using Fourier image spectroscopy (FIS) [5]–[7] show that the photonic bandgap (PBG) of DBRs blue-shift in the visible region (650 nm to 500 nm).

关键词： Blue shift Bragg reflectors finite-difference time-domain method Laser systems Optical imaging Photonic crystals

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Phase-Change Metasurfaces for Dynamic Image Display and Information Encryption

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Physical Review Applied 2022年第4期18卷 044078-044078页

作者： Tingting Liu Zhou Han Junyi Duan Shuyuan Xiao Institute of Photonic Chips University of Shanghai for Science and Technology Shanghai 200093 People’s Republic of China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 People’s Republic of China Institute for Advanced Study Nanchang University Nanchang 330031 People’s Republic of China Jiangxi Key Laboratory for Microscale Interdisciplinary Study Nanchang University Nanchang 330031 People’s Republic of China

Optical metasurfaces enable us to engineer the electromagnetic space and control light propagation at an unprecedented level, offering a powerful tool to achieve modulation of light over multiple physical dimensions. Here, we demonstrate a Sb2S3 phase-change metasurface platform that allows active manipulation of both the amplitude and the phase. In particular, we implement dynamic nanoprinting and holographic image display through the tuning of the crystallization levels of this phase-change material. The Sb2S3 nanobricks tailored to perform the amplitude, geometric, and propagation-phase modulation constitute the dynamic meta-atoms in the multiplexed metasurfaces. Using the incident polarizations as decoding keys, the encoded information can be reproduced in the form of a nanoprinted grayscale image in the near field and two holographic images in the far field. These images can be switched on and off by taking advantage of the reversible tunability of the Sb2S3 nanostructure between the amorphous and crystalline states. The proposed phase-change metasurfaces featuring manifold information and multifold encryption promise ultracompact data storage with high capacity and high security, which suggests an exciting direction for modern cryptography and security applications.

关键词： Imaging & optical processing Nanophotonics Phase-change materials Chalcogenides Metasurfaces finite-difference time-domain method Optical computing Optical techniques

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Ultra-fast tunable optoelectronic 2-to-4 binary decoder using graphene-coated silica rods in photonic crystal ring resonators

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OPTICAL AND QUANTUM ELECTRONICS 2022年第11期54卷 767-767页

作者： Naghizade, Saleh Didari-Bader, Azadeh Saghaei, Hamed Islamic Azad Univ Tabriz Branch Young Researchers & Elite Club Tabriz Iran Chapman Univ Dale E & Sarah Ann Fowler Sch Engn Orange CA USA Islamic Azad Univ Dept Elect Engn Shahrekord Branch Shahrekord Iran Islamic Azad Univ Energy Res Ctr Shahrekord Branch Shahrekord Iran

Fast and compact optoelectronic devices are highly sought after for applications in high-speed signal processing in optical communication networks. One approach to realizing such devices is through all-optical digital logic circuits. One of the main building blocks of such circuits is a decoder. In this work, we present a novel design for a tunable optoelectronic 2-to-4 binary decoder. The presented structure is realized by utilizing three photonic crystal (PhC) ring resonators. Each PhC ring resonator is formed by silicon rods encircled by silica (SiO2) rods coated with graphene nanoshells (GNSs). By adjusting the chemical potential of GNS with a proper gate voltage, we can tune the desired PhC resonant mode. The fundamental PhC microstructure's photonic band structure is analyzed by using the plane wave expansion method. Furthermore, the finite-difference time-domain technique is used to solve Maxwell's equations and analyze the light propagation within the structure. Our numerical results reveal that 0.8 ps and 0.3 ps are the maximum rise and fall times for the final structure, respectively and the total size of this device is 850 mu m(2). Due to the short rise and fall times and its size which are among very important features in high-speed systems, the proposed design could be utilized for high-speed signal processing systems in miniaturized optical communication network devices.

关键词： Photonic crystal Optoelectronic decoder Graphene-coated silica rods Chemical potential Light propagation finite-difference time-domain method

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Role of polarization-photon coupling in ultrafast terahertz excitation of ferroelectrics

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Physical Review B 2022年第14期106卷 L140302-L140302页

作者： Shihao Zhuang Jia-Mian Hu Department of Materials Science and Engineering University of Wisconsin-Madison Madison 53706 WI United States

We investigate the role of polarization-photon coupling (specifically, the polarization-oscillation-induced radiation electric field) in the excitation of ferroelectric thin films by an ultrafast terahertz electric field pulse. Analytical formulas are developed to predict how the frequencies and relaxation time of three-dimensional soft mode phonons (intrinsic polarization oscillation) are modulated by the radiation electric field and epitaxial strain. Ultrafast terahertz-pulse-driven excitation of harmonic polarization oscillation in strained single-domain ferroelectric thin film is then simulated using a dynamical phase-field model that considers the coupled strain-polarization-photon dynamics. The frequencies and relaxation time extracted from such numerical simulations agree well with analytical predictions. In relatively thin films, it is predicted that the radiation electric field slightly reduces the frequencies but significantly shortens the relaxation time. These results demonstrate the necessity of considering polarization-photon coupling in understanding and predicting the response of ferroelectric materials to ultrafast pulses of terahertz and higher frequencies.

关键词： Ferroelectricity Ferroelectrics Classical electromagnetism finite-difference time-domain method Landau-Ginzburg-Devonshire theory Phase-field modeling

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Resonator Design For High-Brightness Luminescent Concentrator Pumped MASERs

Resonator Design For High-Brightness Luminescent Concentrato...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Sophia Long Bethan Ford Michael Elsdon Hamdi Torun Juna Sathian Faculty of Engineering and Environment Northumbria University Newcastle UK

ISBN: (纸本)9798350345995

The MASER, the microwave analogue of a laser, is a device which produces electromagnetic waves through the amplification of stimulated emission. The maser has had limited widespread technological impact due to the high vacuum, strong magnetic field and absolute zero temperatures needed to function [1]. With little prospect of cost reduction, mass production, and miniaturisation, the future of room-temperature solid-state maser technology seemed a little bleak until recently, when recent breakthroughs in optically pumping masers have led to significant progress [2]. This advanced technology demonstrates the potential of solid-state masers with unparalleled performance as low-noise amplifiers, with applications in medicine, radio astronomy, and data communication [3].

关键词： Computer simulation Concentrators finite-difference time-domain method Illumination design Optical pumping Optical resonators

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Prediction of vibroacoustic transmission characteristics through double-plate floor structures by using finite-difference time-domain analysis

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ACOUSTICAL SCIENCE AND TECHNOLOGY 2019年第5期40卷 344-355页

作者： Asakura, Takumi Tokyo Univ Sci 2641 Yamazaki Noda Chiba 2780022 Japan

A vibroacoustic numerical method employing a finite-difference time-domain (FDTD) method, in which the target floor structure consisting of a floor panel supported by support legs on a floor slab is modeled as a composition of two-dimensional plate elements for the double plate structure and one-dimensional bar elements for the support legs, is proposed. While floor impact sound is difficult to accurately predict owing to the complexity of the vibroacoustic mechanism influenced by the coupling phenomena with the vibration of the double-plate structure connected by support legs and the sandwiched air layer between the double plates. In this paper, the basic theory of the proposed numerical scheme was validated through comparison with excitation test on an acrylic scale model, and the applicability of the method to a practical case of a vibroacoustic transmission via a two-layered floor structure was discussed through a numerical case study.

关键词： finite-difference time-domain method Wave-based analysis Dimension-reduced model Floor impact sound Bending wave

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3D Polymer Interconnects for Neuromorphic Photonics Technologies

3D Polymer Interconnects for Neuromorphic Photonics Technolo...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Artur Andrishak Tiago L. Alves Ricardo M. R. Adão Christian Maibohm Bruno Romeira Jana B. Nieder INL-International Iberian Nanotechnology Laboratory Ultrafast Bio- and Nanophotonics Group Av. Mestre Veiga s.n. Braga Portugal

ISBN: (纸本)9798350345995

Quantum and neuromorphic computational platforms based on integrated photonic circuits require next-generation optical functionalities and increasingly complex on-chip light-routing capabilities enabling, for instance, high interconnectivity and superpositions, which are paramount for the realization of artificial neural networks. In such integrated photonic circuits, the single optical interconnect would be individually designed and optimized; for complex networks, two-photon polymerization (TPP)-based microprinting allows for expanding the waveguides into 3D which is not achievable by standard planar lithography fabrication technologies.

关键词： finite-difference time-domain method Light matter interactions Lithography Neural networks Optical interconnects Polymer waveguides

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Ultra-Fast High-Contrast Optical Modulation in Si Metasurfaces

Ultra-Fast High-Contrast Optical Modulation in Si Metasurfac...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Anton A. Trifonov Khosro Zangeneh Kamali Kaloyan Georgiev Lei Xu Giulia Crotti Unai Arregui Leon Mohsen Rahmani Giuseppe Della Valle Ivan Buchvarov Dragomir Neshev Physics Department John Atanasoff Center for Bio and Nano Photonics (JAC BNP) Sofia University “St. Kl. Ohridski” Sofia Bulgaria Dept. of Electronics Materials Engineering ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS) Research School of Physics Australian National University ACT 2601 Australia Department of Engineering Advanced Optics and Photonics Laboratory School of Science and Technology Nottingham Trent University Nottingham United Kingdom Dipartimento di Fisica - Politecnico di Milano Milano Italy

ISBN: (纸本)9798350345995

Ultra-fast modulation of dielectric metasurfaces has shown a great promise for novel optical switching [1] and wavelength conversion [2]. A number of mechanisms have been recently explored, however the overall transmission modulation in such all-optical processes has remained low, typically a few percents. To increase the modulation contrast, high-quality factor metasurfaces manufactured on stable materials are required. Here, we demonstrate a high-contrast transmission modulation metasurface with ultra-fast response. In our metasurface design, the interference of the non-radiative asymmetric bound-state in the continuum (BIC) channel and a radiative electric dipole form a kink-type transmission response. Based on this engineered response, we demonstrate absolute transmission modulation of over 25% with a few tens of picoseconds time-response, driven by carrier injection in the crystalline silicon metasurface.

关键词： Coupled mode theory finite-difference time-domain method Metasurfaces Modulation Scanning electron microscopy Wavelength conversion

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