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A Dissipation Theory for Potentials-Based FDTD for Lossless Inhomogeneous Media

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2022年第3期21卷 486-490页

作者： Bekmambetova, Fadime Triverio, Piero Univ Toronto Edward S Rogers Sr Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada

A dissipation theory is proposed for the potentials-based finite-difference time-domain (FDTD) algorithm for the case of inhomogeneous lossless media. We show that under the Courant-Friedrichs-Lewy limit, the equations describing the time evolution of scalar and vector potentials can be seen as a lossless system. The developed theory provides insights into how electromagnetic energy and power flow are approximated in FDTD schemes. It can also be used to create new algorithms with guaranteed stability.

关键词： Mathematical models finite difference methods time-domain analysis Faces Electric potential Power system stability Electromagnetics Energy conservation finite-difference time-domain method scalar potential stability vector potential

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Simulation of Electromagnetic Wave Propagation in Magnetic Randomly Inhomogeneous Magnetic Media

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IEEE MAGNETICS LETTERS 2022年 13卷 1页

作者： Makarov, Pavel Ustyugov, Vladimir Kotov, Leonid Nekipelov, Sergey Sivkov, Viktor Syklyvkar State Univ Syktyvkar 167000 Russia Russian Acad Sci Ural Div Komi Sci Ctr Inst PhysMath Syktyvkar 167982 Russia

This letter presents an algorithm for numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the finite differences in the time domain (FDTD) method. The algorithm is suitable for analyzing the main timing characteristics, as well as for identifying the features of the propagation of various types of signals in both time-independent and time-dependent, layered, randomly inhomogeneous media. Simulation was carried out of the propagation of the sine pulse, sine signal, and square wave in time-independent magnetic randomly inhomogeneous media with various levels of phase contrast of two types: with a "diffuse" distribution of inhomogeneities and their "close packing." The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

关键词： Nonhomogeneous media Mathematical models finite difference methods Receiving antennas time-domain analysis Numerical models Magnetoacoustic effects Electromagnetics finite-difference time-domain method magnetic films numerical methods

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Photovoltaic Nano-Concentrator Integrated with Graphene Metamaterial for Energy Harvesting

Photovoltaic Nano-Concentrator Integrated with Graphene Meta...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Awad, Ehab Electrical Engineering Department College of Engineering King Saud University Riyadh11421 Saudi Arabia

ISBN: (纸本)9781957171296

An extended-bandwidth solar concentrator with 60nm spot-focusing is presented. It enhances the optical absorption of graphene mesh-like metamaterial for applications in photovoltaic energy harvesting. The concentrator has a compact-size, flat spectral response, and polarization-insensitive operation. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： finite-difference time-domain method Graphene Optical absorption Solar cells Solar concentrators Surface plasmon polaritons

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Multilevel Monte Carlo FDTD method for Uncertainty Quantification

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2022年第10期21卷 2030-2034页

作者： Zhu, Xiaojie Di Rienzo, Luca Ma, Xikui Codecasa, Lorenzo Xi An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment Sch Elect Engn Xian 710049 Peoples R China Politecn Milan Dipartimento Elettron Informaz & Bioingn I-20133 Milan Italy

The recent multilevel Monte Carlo method is here proposed for uncertainty quantification in electromagnetic problems solved by the finite-difference time-domain (FDTD) method, when material parameters are modeled as random variables. It improves the estimations of the mean and variance of the quantities of interest computed on a FDTD spatial grid by sampling at coarser levels of discretization. The proposed approach can amply reduce the computational cost of the standard Monte Carlo FDTD, at the price of a small reduction of its accuracy. It is advantageous with respect to polynomial chaos FDTD, when the latter fails or becomes prohibitive for computational requirements. It also appears to widely outperform stochastic FDTD in terms of accuracy.

关键词： finite difference methods time-domain analysis Monte Carlo methods Standards Uncertainty Random variables Electric fields finite-difference time-domain method multilevel Monte Carlo method (MLMC) uncertainty quantification

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Error-Controllable Scheme for the LOD-FDTD method

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IEEE JOURNAL ON MULTISCALE AND MULTIPHYSICS COMPUTATIONAL TECHNIQUES 2022年 7卷 135-141页

作者： Nakazawa, Tasuku Wu, Di Kishimoto, Seiya Shibayama, Jun Yamauchi, Junji Ohnuki, Shinichiro Nihon Univ Coll Sci & Technol Tokyo 1018308 Japan Hosei Univ Fac Sci & Engn Koganei Tokyo 1848584 Japan

The implicit locally one-dimensional finite-difference time-domain (LOD-FDTD) method is useful for designing plasmonic devices and waveguide structures. By using a large timestep size, the implicit LOD-FDTD method can reduce the computational time;however, this involves a trade-off with accuracy. To overcome this trade-off, we propose an error-controllable scheme for the LOD-FDTD method, wherein the fast inverse Laplace transform is employed to generate the electromagnetic field in arbitrary time domain from that in complex frequency domain. Compared to the conventional LOD-FDTD method, our scheme provides higher accuracy with more efficient calculations.

关键词： finite difference methods time-domain analysis Mathematical models Gold Frequency-domain analysis Dispersion Computational modeling Error control fast inverse laplace transform finite-difference complex-frequency-domain method finite-difference time-domain method locally one-dimensional method parallel computing plasmonic device

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Strain-tunable emission from single photon emitters in a Hexagonal Boron Nitride Metasurface

Strain-tunable emission from single photon emitters in a Hex...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Manna, Arnab Frödi, Johannes E. Majumdar, Arka Department of Physics University of Washington SeattleWA98195 United States Department of Electrical & Computer Engineering University of Washington SeattleWA98195 United States

We propose and demonstrate a large in-situ strain tuning of quasi bound-states in continuum (qBIC) mode coupled photoluminescence of single photon emitters in a partially etched hexagonal boron nitride metasurface at ... 详细信息

ISBN: (纸本)9781957171296

关键词： finite-difference time-domain method Information processing Photoluminescence Quantum communications Refractive index Strain

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Efficient inverse design for tailoring a terahertz metagrating

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Photonics Research 2025年第5期13卷 1172-1181页

作者： JIA SHI GUANLONG WANG SHAONA WANG WENJING YU LING LIANG WEILING FU PINGJUAN NIU JIANQUAN YAO XIANG YANG Tianjin Key Laboratory of Optoelectronic Detection Technology and System School of Electronic and Information EngineeringTiangong University Key Laboratory of Opto-Electronics Information Technology (Ministry of Education) School of Precision Instruments and Opto-Electronic Engineering Tianjin University Department of Laboratory Medicine Daping Hospital Third Military Medical University (Army Medical University) Department of Laboratory Medicine Southwest Hospital Third Military Medical University (Army Medical University)

The fast and accurate design of terahertz devices for specific applications remains challenging,especially for tailoring metadevices,owing to the complex electromagnetic characteristics of these devices and their large structural parameter *** unique functionalities achieved by metadevices come at the cost of structural complexity,resulting in a time-consuming parameter sweep for conventional metadevice ***,we propose a general solution to achieve efficient inverse design for a terahertz metagrating via machine *** with different structural parameters were selected as illustrations to verify the effectiveness of this *** proof-of-principle examples,the metagratings predicted via the inverse design model are numerically calculated and experimentally ***,the physical modeling of a metagrating is performed via the finite element method (FEM).A spectrum dataset obtained from FEM simulation is prepared for the training of machine learning ***,trained machine learning models,including the Elman neural network (Elman),support vector machine (SVM),and general regression neutral network (GRNN),are used to predict probable structural *** results of these models are compared and analyzed comprehensively,which verifies the effectiveness of the inverse design *** with conventional methods,the inverse design method is much faster and can encompass a high degree of freedom to generate metadevice structures,which can ensure that the spectra of generated structures resemble the desired ones and can provide accurate data support for metadevice ***,a metagrating tailored by an inverse design is used as a biological sensor to distinguish different *** proposed data-driven inverse design method realizes fast and accurate design of the metagrating,which is expected to have great potential in metadevice design and tailoring for specific applications.

关键词： finite-difference time-domain method Inverse design Machine learning Neural networks Numerical simulation Polarimetric imaging

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Holey metalens focusing of extreme ultraviolet light

Holey metalens focusing of extreme ultraviolet light

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2023 Flat Optics: Components to Systems, FLatOptics 2023 in Optica Imaging Congress - Part of Imaging and Applied Optics Congress 2023

作者： Ossiander, M. Meretska, M.L. Hampel, H.K. Lim, S.W.D. Knefz, N. Jauk, T. Capasso, F. Schultze, M. John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Institute of Experimental Physics Graz University of Technology Graz8100 Austria

Manipulating light in the extreme ultraviolet wavelength range is challenging due to a limited number of suitable optical materials. In this work, we demonstrate a silicon holey metalens to focus 50-nm wavelength ligh... 详细信息

ISBN: (纸本)9781957171289

关键词： finite-difference time-domain method Optical angular momentum Optical elements Optical materials Refractive index Zone plates

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Ultrasmall InGaP dielectric and plasmonic nanolasers

Ultrasmall InGaP dielectric and plasmonic nanolasers

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Cho, Sangyeon Sarkar, Debarghya Yan, Hao Martino, Nicola Dannenberg, Paul H. Yun, Seok Hyun Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School 65 Landsdowne St. CambridgeMA02139 United States Harvard-MIT Health Sciences and Technology Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States

We demonstrate single-mode InGaP and InGaAsP nanolasers using disk-on-pillar and disk-on-gold structures (360 nm in diameter). Silica-coated nanolaser particles produce stable sub-nanometer emission across 80 nm bandw... 详细信息

ISBN: (纸本)9781957171296

关键词： Electron beam lithography finite-difference time-domain method Laser systems Optical pumping Semiconductor lasers Whispering gallery modes

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Towards Polarization-Dependent Fiber-Integrated Cavities in Hollow-Core Fiber

Towards Polarization-Dependent Fiber-Integrated Cavities in ...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Houk, Anna Maria Flannery, Jeremy Yuan, Yujia Venuturumilli, Sai S. Al Maruf, Rubayet Bajcsy, Michal Institute for Quantum Computing 200 University Ave W WaterlooONN2L 3G1 Canada Department of Physics and Astronomy 200 University Ave W WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering 200 University Ave W WaterlooONN2L 3G1 Canada

We describe the design and fabrication of optical resonators based on a hollow core photonic bandgap fiber (HCPBF) using photonic crystal (PC) mirrors and developments in adding polarization selection to such resonato... 详细信息

ISBN: (纸本)9781957171296

关键词： Chemical vapor deposition finite-difference time-domain method Optical design and fabrication Optical resonators Photonic bandgap fibers Photonic crystals

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