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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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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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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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Interaction between microwave and dielectric surface discharge in vacuum and low-pressure gas

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PLASMA SOURCES SCIENCE & TECHNOLOGY 2022年第9期31卷 095005-095005页

作者： Zhao, Pengcheng Wang, Rui Guo, Lixin Xidian Univ Sch Phys Xian 710071 Peoples R China China Acad Space Technol Natl Key Lab Sci & Technol Space Microwave Xian 710100 Peoples R China

The interaction between high-power microwave and dielectric surface discharge in vacuum and low-pressure gas is investigated by using an electromagnetic particle-in-cell-Monte Carlo collision model. Maxwell equations are solved by the finite-difference time-domain method combined with the boundary condition between the total and scattered field. The simulation results show that the transmission power loss is small and mainly attributed to the absorption of surface discharge, when the secondary electron multipactor reaches a steady state in vacuum. The simulated value of transmission power loss in vacuum is in good agreement with the experimental data. At a low pressure, the multipactor is the main source of electrons in the initial stage of discharge. After the multipactor reaches a steady state, the ionization leads to a significant increase in the number density of plasma near the dielectric surface. The absorbed power of plasma is greater than the reflected power in the initial stage of discharge, but with the increase of time, the latter becomes larger and even close to the power of incident wave. As the pressure increases, the transmission power decays faster due to the increase of ionization rate. When the microwave field near the dielectric surface decays significantly at a low pressure, the steady state of multipactor disappears, and the peak of plasma number density is near the surface, but not closest to the surface.

关键词： secondary electron multipactor collisional ionization dielectric surface discharge particle-in-cell-Monte Carlo collision model finite-difference time-domain method high-power microwave

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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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Analysis of delay variations of the Loran-C across different atmospheric environments 14

Analysis of delay variations of the Loran-C across different...

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14th International Symposium on Antennas Propagation and EM Theory

作者： Zhang, Fuzhi Zhou, Chen Liu, Moran Wuhan Univ Sch Elect Informat Wuhan Peoples R China

ISBN: (纸本)9798350353129;9798350353136

The Loran-C signal propagates through various atmospheric environments, and the speed of the electromagnetic signal changes as it moves through different media. This study aims to analyze the variations in the time delay of the Loran-C signal resulting from its passage through distinct atmospheric conditions. This study simulates different atmospheric environments by varying ground conductivity and corresponding atmospheric refractive indices. The propagation of the Loran-C signal through these varied conditions is modeled using a time-domain finite difference method within a two-dimensional coordinate system. The results indicate that, in the atmospheric environment, the ground conductivity has the greatest impact on the secondary delay of Loran-C signals, on the order of microseconds, whereas the effect of atmospheric refraction index is on the order of nanoseconds. The secondary delay of Loran-C signals decrease monotonically with increasing conductivity of the atmospheric environment. When Loran-C signals traverse different atmospheric conditions, propagation delay may experience abnormal changes of tens of nanoseconds. These variations arise from the inconsistency between the signal envelope and waveform propagation speeds.

关键词： Loran-C electromagnetic wave propagation finite-difference time-domain method time delay

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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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