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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xu, Zhiqian Meng, Cui Tsinghua Univ Dept Engn Phys Beijing Peoples R China

In high-power laser facility, X-rays could generate very strong system-generated electromagnetic pulse (SGEMP). There are two types of SGEMP response and they are both studied through the numerical simulation.

ISBN: (纸本)9780996007870

关键词： finite-difference time-domain method Monte Carlo method PIC particle simulation SGEMP X-rays

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Theoretical and experimental investigations of photonic jet array from rectangle phase diffraction grating

Theoretical and experimental investigations of photonic jet ...

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Optical Manipulation Conference

作者： Liu, Cheng-Yang Yen, Tzu-Ping Minin, Oleg V. Minin, Igor V. Tamkang Univ Dept Mech & Electromech Engn New Taipei Taiwan Siberian State Univ Geosyst & Technol Novosibirsk Russia

ISBN: (数字)9781510619821

ISBN: (纸本)9781510619821

The generations of photonic jet array using rectangle phase diffraction grating at visible light region are demonstrated numerically and experimentally for the first time. The power flow patterns for the rectangle diffraction grating are simulated by using the finite-difference time-domain method. In experiment, the rectangle phase diffraction grating was fabricated with polydimethylsiloxane material. The direct imaging of the spatial and amplitude features for the grating-assisted photonic jet array is performed with a scanning optical microscope system. The focusing qualities of photonic jet array are evaluated in terms of focal length and transversal width along propagation and transversal directions. The photonic jet array could be operated in a wide range application for nanotechnology, self-assembly, energy generation and storage materials through the rectangle phase diffraction grating.

关键词： photonic jet diffraction grating subwavelength imaging focusing finite-difference time-domain method

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A hybrid method for scattering by multiple bodies

A hybrid method for scattering by multiple bodies

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Conference on Metamaterials, Metadevices, and Metasystems

作者： Gourdin, Anthony Genevet, Patrice Felbacq, Didier Univ Montpellier L2C CNRS F-34095 Montpellier France SAFRAN Elect & Def Paris France Univ Cote Azur CNRS CRHEA Valbonne France

ISBN: (纸本)9781510620100

We present a numerical methods that allows to compute the field scattered by a collection of resonant elements. It is a hybrid scheme based on one part on a variant of the DDA to deal with a single scatterer, associated with a multiple scattering theory based on Calderon projectors and the method of fictitious sources. This allows to deal efficiency with aperiodic set of scatterers not disposed arbitrary in space.

关键词： Multiple scattering Scattering Defense and security Electronics Numerical analysis Projection systems finite element methods finite-difference time-domain method Homogenization Metamaterials

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3D simulation for scatter light distribution of optical surface defects 12

3D simulation for scatter light distribution of optical surf...

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Conference on Optical Manufacturing and Testing XII

作者： Chai, Huiting Zhang, Pengfei Yang, Yongying Bai, Jian Zhang, Yihui Zhejiang Univ Coll Opt Sci & Engn State Key Lab Modern Opt Instrumentat Hangzhou 310027 Zhejiang Peoples R China

ISBN: (数字)9781510620568

ISBN: (纸本)9781510620568

Surface defects evaluation system (SDES) works on the principle of microscopic scattering dark-field imaging (MS-DFI) and takes the criterion board as reference for calibration. Unfortunately, for criterion board with rectangular section scribed lines, image width of narrow lines doesn't follow the linear law, making it confusing to get real width. Besides, other criterion board except with rectangular section scribed lines in a flat plane is difficult to fabricate, which limits measurement accuracy and extensive use of SDES. In this paper, a 3D simulation model is established to simulate scatter light distribution induced by surface defects. The interactions between the incident light and surface defects in near field is calculated with the help of finite-difference time-domain (FDTD) method, a kind of Maxwell's solver. Skills as rotation and incoherent summation are applied to obtain results under illumination of unpolarized, broad-spectrum natural light sources in uniform annular layout. Finally, near to far field projections based on vector diffraction theory is carried out to get scatter light intensity distribution in far field. The data is also post-processed by scripts to describe imaging process simplified by a lens system so that it can be compared to experiment images. The 3D simulation model reveals MS-DFI process theoretically and may help to interpret image width of surface defects. The establishment of the 3D imaging model is an attempt to overcome the limits of the criterion board and is expected to provide reference for calibration for wider applications of SDES.

关键词： Surface defects microscopic scattering dark-field imaging finite-difference time-domain method scatter light intensity distribution 3D electromagnetic simulation model measurement

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Lightning Surge Analysis of a PWR Nuclear Power Plant Using the Three-Dimensional FDTD method 34

Lightning Surge Analysis of a PWR Nuclear Power Plant Using ...

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34th International Conference on Lightning Protection (ICLP)

作者： Tatematsu, A. Motoyama, H. Tanigawa, A. Cent Res Inst Elect Power Ind Elect Power Engn Res Lab Yokosuka Kanagawa Japan Japan Atom Power Co Int Project Dev Dept Tokyo Japan

ISBN: (纸本)9781538666357

Lightning protection is an important factor in the design of nuclear power plants, for example, to protect power equipment and sensitive electronic devices and guarantee human safety. To design effective protection measures, it is useful to predict lightning surge phenomena and evaluate the effectiveness of the protection measures. Recently, the finite-difference time-domain (FDTD) method, which solves Maxwell's equations directly and does not require the assumption of a transverse electromagnetic mode, has been an effective tool for analyzing electromagnetic transient phenomena in three-dimensional or grounding structures. In this study, we model buildings and groundings of a nuclear power plant using an FDTD-based surge simulation code, study the ground potential rises of a nuclear power plant, step voltages around the reactor building, and the transient responses of grounding buses drawn into the auxiliary building and the metal sheaths of coaxial cables in the case of a direct lightning strike to the lightning protection system (LPS) of the reactor or turbine building, and study the effect of the configuration of the LPS.

关键词： electromagnetic transient analysis finite-difference time-domain method grounding lightning lightning protection system

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Numerical Modelling of the Optical Gain Medium 7

Numerical Modelling of the Optical Gain Medium

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7th IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Yu, Yaxin Zhang, Zan Hu, Xiaochuan Bai, Bing Jin, Yinli Li, Dengfeng Wang, Guiping Changan Univ Coll Elect & Control Engn Xian Peoples R China

ISBN: (纸本)9781538656488

An enhanced FDTD algorithm is proposed for simulating the electromagnetic interactions of light with gain medium characterized by a semi-quantum system of 6 discrete energy-levels. The whole system then consists of 3 quantum-mechanics-corrected dipole oscillators coupled with a set of appropriate rate equations allowing efficient simulations without complex quantum-mechanics calculations.

关键词： finite-difference time-domain method Gain Active Medium

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Efficient finite-difference time-domain Modeling of Short-Gap Electrostatic Discharge Caused in the Vicinity of a Complex Electronic System

Efficient Finite-Difference Time-Domain Modeling of Short-Ga...

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IEEE International Conference on Computational Electromagnetics (ICCEM)

作者： Fujita, Kazuhiro Fujitsu Ltd Tech Comp Solut Unit Mihama Ku 9-3Nakase 1 Chome Chiba Chiba 2618588 Japan

ISBN: (纸本)9781509010387

This paper addresses efficient finite-difference time-domain (FDTD) modeling of transient interactions of complex electronic systems with electrostatic discharge occurred at a short air gap. A partially implicit FDTD scheme with the nonlinear spark resistance model by Rompe and Weizel is applied to a realistic personal computer model. Its efficiency and accuracy are assessed in comparison with Yee's FDTD method.

关键词： electrostatic discharge spark finite-difference time-domain method Newmark-beta method

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Propagation Characteristics of Vortex Light

Propagation Characteristics of Vortex Light

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作者： Changquan Xia Xingyue Zhao Jingrong Zhu School of physical science and technology Yangzhou University

Spiral beam of light is angled class such as phase vortex, with orbital angular momentum, the beam center for diffraction phase singularity secretly empty structures, because each photon of light beam is orbital angular momentum, can use this feature to realize to control the micro particles, avoids because of the traditional operating mode of particle damage, this technique is known as the "optical *** the same time, the orthogonality of vortex light with different topological charges can be used to realize the multiplexing technology of optical communication and improve the transmission capacity of optical *** order to study the transmission characteristics of vortex light, the FDTD finite-difference time-domain method is used to analyze the most common laguerre gaussian beams, and the mathematical modeling and theoretical simulation are carried out on them.

关键词： Vortex Light Wavefront Phase Laguerre Gaussian Beam finite-difference time-domain method Orbital Angular Momentum Transmission Characteristics

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Dynamic theory of nanophotonic control of two-dimensional semiconductor nonlinearities

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Physical Review B 2018年第24期98卷 245307-245307页

作者： S. Guazzotti A. Pusch D. E. Reiter O. Hess The Blackett Laboratory Imperial College London Prince Consort Road London SW7 2AZ United Kingdom School of Photovoltaic and Renewable Energy Engineering UNSW Sydney 2052 Kensington Sydney Australia Institut für Festkörpertheorie Universität Münster Wilhelm-Klemm-Str. 10 48149 Münster Germany

We introduce a Maxwell-Bloch simulation approach which self-consistently combines a microscopic description of the carrier and polarization dynamics of a transition-metal-dichalcogenide (TMDC) monolayer with a spatiotemporal full-wave time-domain simulation of Maxwell's equations on the basis of a finite-difference time-domain (FDTD) method beyond the slowly varying amplitude or paraxial approximations. This offers a platform to realistically model, in particular, the typical ultrafast optical excitation experiments in micro- and nanocavities. Our simulations confirm that the weak screening of the Coulomb interaction in TMDC monolayers yields pronounced exciton lines in the linear spectrum and we uncover the second-order nonlinearity represented in the semiconductor Maxwell-Bloch equations by an intraband dipole moment. This allows us to calculate the spectral shape of the exceptionally strong second-harmonic generation around the exciton lines of TMDC monolayers. We demonstrate that the second-harmonic signal can remarkably be further enhanced by several orders of magnitude through a suitably designed (one-dimensional) photonic microcavity. Due to its self-consistency, flexibility, explicit spatio-temporal resolution on the nanoscale and the ready access to light field and electron dynamics, our theory and computational approach is an ideal platform to design and explore spatiotemporal nonlinear and quantum dynamics in complex photonic or plasmonic micro- and nanostructures for optoelectronic, nanophotonic and quantum applications of TMDC monolayers.

关键词： Nonlinear optics Dichalcogenides finite-difference time-domain method Hartree-Fock methods

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Localized Surface Magnetic Modes Propagating Along a Chain of Connected Subwavelength Metamaterial Resonators

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Physical Review Applied 2018年第3期10卷 034054-034054页

作者： Zhen Liao Guo Qing Luo Hui Feng Ma Bai Cao Pan Ben Geng Cai Yu Feng Yu Tie Jun Cui Key Laboratory of RF Circuits & System of Ministry of Education Institute of Antennas and Microwave Technology Hangzhou Dianzi University Xiasha High Education Park Hangzhou 310018 China State Key Laboratory of Millimetre Waves Southeast University Nanjing 210096 China

Magnetic resonance coupling theory for connected metamaterial resonators is studied and experimentally demonstrated. The subwavelength resonators have dominantly conductive coupling through the current exchange. Two distinct interactions are observed in two different connection configurations. Based on the strong coupling, one-dimensional localized surface magnetic modes propagating along a chain of subwavelength resonators are proposed. By changing the connection configuration, the surface wave can be switched between the forward and backward modes. The numerical simulations and experiments are in good agreement. The proposed mechanism of energy transport in the subwavelength scale has potential applications in integrated devices and circuits.

关键词： Electromagnetic waves & oscillations Exchange interaction Metamaterials Photonics Plasmonics Surface gravity waves finite-difference time-domain method Resonance techniques

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