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Optical Fiber Communications Conference and Exhibition (OFC)

作者： Li, Kang Peng, Hejie Wang, Siwei Chen, Lin Wang, Jian Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect & Sch Opt & Elect Inform Wuhan 430074 Hubei Peoples R China Opt Valley Lab Wuhan 430074 Hubei Peoples R China

We experimentally demonstrate a silicon chiral mode switching device by dynamically encircling exceptional point at 2 mu m waveband, with high purities (> 95%) for both TE0 and TE1 modes in a broad bandwidth (85 nm).

ISBN: (纸本)9798350377583

关键词： Chemical vapor deposition finite-difference time-domain method Numerical simulation Photonic crystal waveguides Photonic crystals Silicon photonics

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Generative model for multiple-purpose inverse design and forward prediction of disordered waveguides in linear and nonlinear regimes

Generative model for multiple-purpose inverse design and for...

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Conference on Machine Learning in Photonics

作者： Guo, Ziheng Guo, Zhongliang Arandelovic, Oggie di Falco, Andrea Univ St Andrews Sch Phys & Astron St Andrews KY16 9SS Fife Scotland Univ St Andrews Sch Comp Sci St Andrews KY16 9SS Fife Scotland

ISBN: (纸本)9781510673533;9781510673526

Data-driven machine learning framework has become a state-of-art technique to explore whole parameters design space for designing complex systems. In this work, we used conditional generative adversarial networks to inverse design three problems that we are interested in random nanophotonic systems: pattern optimization, geometry generation, and pattern reproduction. Meanwhile, automation convolutional neural networks group for forward prediction of the transmission spectra of disordered waveguides in linear and nonlinear regimes, at telecommunication wavelengths.

关键词： Design Waveguides Network architectures Neural networks Gallium nitride Optical transmission Complex systems finite-difference time-domain method Nonlinear transmission Systems modeling

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WaveBlender: Practical Sound-Source Animation in Blended domains 24

WaveBlender: Practical Sound-Source Animation in Blended Dom...

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2024 SIGGRAPH Asia Conference

作者： Xue, Kangrui Wang, Jui-Hsien Langlois, Timothy James, Doug Stanford Univ Stanford CA 94305 USA Adobe Res San Francisco CA USA NVIDIA Santa Clara CA USA

ISBN: (纸本)9798400711312

Synthesizing sound sources for modern physics-based animation is challenging due to rapidly moving, deforming, and vibrating interfaces that produce acoustic waves within the air domain. Not only must the methods synthesize sounds that are faithful and free of digital artifacts, but, in order to be practical, the methods should be easy to implement and support fast parallel hardware. Unfortunately, no current solutions satisfy these many conflicting constraints. In this paper, we presentWaveBlender, a simple and fast GPU-accelerated finite-difference time-domain (FDTD) acoustic wavesolver for simulating animation sound sources on uniform grids. To resolve continuously moving and deforming solid- or fluid-air interfaces on coarse grids, we derive a novel scheme that can temporally blend between two subsequent finite-difference discretizations. Our blending scheme requires minimal modification of the original FDTD update equations: a single new blending parameter.. (defined at cell centers) and approximate velocity-level boundary conditions. Sound synthesis results are demonstrated for a variety of existing physics-based sound sources (water, modal, thin shells, kinematic deformers), along with point-like sources for tiny rigid bodies. Our solver is reliable across different resolutions, GPU-friendly by design, and can be 1000x faster than prior CPU-based wavesolvers for these animation sound problems.

关键词： Sound synthesis Computer animation finite-difference time-domain method

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Analysis of the electromagnetic wave illumination on the transmission lines with nonlinear terminations

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INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES 2022年第1期14卷 43-53页

作者： Seifi, Z. Ghorbani, A. Abdipour, A. Amirkabir Univ Technol Dept Elect Engn Hafez Ave Tehran Iran

In this paper, an unconditionally stable time-domain method is proposed to investigate the external electromagnetic (EM) field illumination on the nonlinearly loaded transmission lines. In the proposed algorithm, the field to line coupling equations and linear/nonlinear boundary conditions are incorporated and expressed in a matrix form. The derived differential matrix equations are then discretized and solved using the proposed finite difference time domain (FDTD) method approach. The discretized nonlinear matrix equations are also solved by applying a globally convergent iterative method to ensure the stability of the method. Moreover, the experimental investigations are conducted using a transverse EM (TEM) cell for a single microstrip line and a power detector circuit as a nonlinearly loaded transmission line to confirm the accuracy and stability of the proposed method. With the merit of satisfactory accuracy and unconditional stability for the entire range of time steps, the presented approach would be applicable for analyzing the microwave linear/nonlinear circuits subjected to the external incident EM wave.

关键词： finite-difference time-domain method incident electromagnetic (EM) wave nonlinearly loaded transmission line power detector circuit-microwave linear nonlinear circuits transverse electromagnetic (TEM) cell unconditionally stable method

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Orbit-Orbit Interaction of Light: Harnessing Vortex-Trajectory Interplay for Light Manipulation

Orbit-Orbit Interaction of Light: Harnessing Vortex-Trajecto...

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Chaudhary, Raghvendra P. Reiner, Avraham Shitrit, Nir School of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer Sheva8410501 Israel

We report the orbit-orbit interaction of light in a plasmonic ellipse cavity, whose unique geometry facilitates vortex-trajectory interplay. This interaction opens a new paradigm for light manipulation by leveraging t... 详细信息

ISBN: (纸本)9781957171395

关键词： Circular polarization finite-difference time-domain method Light beams Optical vortex beams Optical vortices Orbital angular momentum multiplexing

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Formulation of the finite-difference time-domain method for the analysis of axially symmetric metal nanodevices

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JOURNAL OF MODERN OPTICS 2012年第16期59卷 1439-1447页

作者： Liu, Yuling Yu, Weixing Zhejiang Univ Technol Coll Sci Hangzhou 310014 Zhejiang Peoples R China Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys State Key Lab Appl Opt Changchun 130033 Peoples R China

A systematic finite-difference time-domain method, established in the cylindrical coordinate and integrated with the six-pole Lorentz-Drude model using the auxiliary differential equation method, is formulated. The model is appropriate for analyzing metal photonic devices with an axially symmetric nanostructure, such as metal nanowires, metal particles, and plasmonic lenses. As an example, an experimentally demonstrated plasmonic lens is analyzed based on the Drude model, the Lorentz-Drude model, and the Lorentz model. Depending on the different dispersion models, distinct electric field distributions for the plasmonic lens are obtained. The interesting numerical results, which are explained in this paper, show the high efficiency and accuracy of the simulation model.

关键词： finite-difference time-domain method plasmonic lens metal nanodevice axially symmetric nanostructure Lorentz-Drude model

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A Single-Celled Design Approach for Tri-Channel Metalenses

A Single-Celled Design Approach for Tri-Channel Metalenses

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Guo, Xudong Wong, Kenneth K.Y. Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road 999077 Hong Kong Advanced Biomedical Instrumentation Centre Hong Kong Science Park New Territories Shatin Hong Kong

We present a non-interleaved single-celled design approach for tri-channel metalenses. We encode each meta-atom with three independent phase responses to generate three different spin-selective metalenses, which enabl... 详细信息

ISBN: (纸本)9781957171395

关键词： finite-difference time-domain method Metasurfaces Optical imaging Optical manipulation Phase Segmentation

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Sub-gridding FDTD Algorithm for 3D Numerical Analysis of EM Scattering and Radiation Problems

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Electromagnetic Science 2023年第4期1卷 24-31页

作者： Fatih Kaburcuk Atef Z.Elsherbeni Sivas Cumhuriyet University Sivas 58140Türkiye Colorado School of Mines GoldenCO 80401USA

The finite-difference time-domain(FDTD)method is used effectively to solve electromagnetic(EM)scattering and radiation problems using a 3D sub-gridding *** accuracy and stability of the FDTD method,the computational domain of EM problems with locally fine structures or electrically small objects is discretized with finer *** sub-gridding algorithm for different regions of the computational domain was implemented to increase the accuracy and reduce the computational time and memory requirements compared to those of the traditional FDTD *** the sub-gridding algorithm,the FDTD computational domain is divided into separate regions:coarse grid and fine grid *** the cell sizes and time steps are different in the coarse and fine grid regions,interpolations in both time and space are used to evaluate the electric and magnetic fields on the boundaries between different *** accuracy of the developed 3D sub-gridding algorithm has been verified for radiation and scattering problems,including multiple fine grid *** performance is obtained even for higher and different contrast ratios in fine grid regions.

关键词： finite-difference time-domain method Sub-gridding algorithm Temporal and spatial interpolations

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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： Shi, Jia Wang, Guanlong Wang, Shaona Yu, Wenjing Liang, Ling Fu, Weiling Niu, Pingjuan Yao, Jianquan Yang, Xiang Tiangong Univ Sch Elect & Informat Engn Tianjin Key Lab Optoelect Detect Technol & Syst Tianjin 300387 Peoples R China Tianjin Univ Sch Precis Instruments & Optoelect Engn Key Lab Optoelect Informat Technol Minist Educ Tianjin 300072 Peoples R China Third Mil Med Univ Army Med Univ Daping Hosp Dept Lab Med Chongqing 400038 Peoples R China Third Mil Med Univ Army Med Univ Southwest Hosp Dept Lab Med Chongqing 400038 Peoples R China

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 space. The unique functionalities achieved by metadevices come at the cost of structural complexity, resulting in a time-consuming parameter sweep for conventional metadevice design. Here, we propose a general solution to achieve efficient inverse design for a terahertz metagrating via machine learning. Metagratings with different structural parameters were selected as illustrations to verify the effectiveness of this method. As proof-of-principle examples, the metagratings predicted via the inverse design model are numerically calculated and experimentally demonstrated. Initially, 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 models. Then, 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 parameters. The results of these models are compared and analyzed comprehensively, which verifies the effectiveness of the inverse design method. Compared 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 modeling. Furthermore, a metagrating tailored by an inverse design is used as a biological sensor to distinguish different microorganisms. The 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 applica

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

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Propagation Model of Very Low Frequency Waves in the Ionosphere 14

Propagation Model of Very Low Frequency Waves in the Ionosph...

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14th International Symposium on Antennas Propagation and EM Theory

作者： Wu, Yiyun Liu, Moran Zhou, Chen Wuhan Univ Sch Elect Informat Wuhan Peoples R China

ISBN: (纸本)9798350353129;9798350353136

Based on the finite-difference time-domain method with inhomogeneous grid and GPU parallel computing, this paper establishes the propagation model of very low frequency (VLF) waves in the ionosphere. The model can flexibly modify ionospheric parameters and simulate the propagation of VLF waves under different ionospheric conditions. This model provides theoretical support for the wide application of VLF waves in the ionosphere and the understanding of the mechanism of the whistler wave in the ionosphere.

关键词： ionosphere electromagnetic wave propagation finite-difference time-domain method very low frequency wave magnetized cold plasma

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