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Enhanced scattering of random-distribution nanoparticles and evanescent field in super-resolution near-field structure

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2005年第5B期44卷 3620-3622页

作者： Li, JM Shi, LP Lim, KG Miao, XS Yang, HX Chong, TC Data Storage Inst Singapore 117608 Singapore Natl Univ Singapore Dept Elect & Comp Engn Singapore 117548 Singapore

This study focuses on evanescent fields induced by silver nanoparticles in the mask layer and in the interfaces in an AgOx-type super-resolution near-field structure (super-RENS). The finite-difference time-domain (FDTD) method is used to analyze the scattering fields from the localized surface plasmons of silver nanoparticles. It has been found that the spatial extension of the evanescent field is very short along the thickness direction of the layers, and the 3-dimensional coupling patterns of the evanescent fields from the individual particles are irregular. The study also found that the intensity of the evanescent fields is dependent on the silver concentration.

关键词： AgOx film super-resolution near-field structure finite-difference time-domain method surface plasmon evanescent fields

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Novel method for analyzing the transient behavior of grounding systems based on the finite-difference time-domain method

Novel method for analyzing the transient behavior of groundi...

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Winter Meeting of the IEEE-Power-Engineering-Society

作者： Tanabe, K CRIEPI Elect Insulat Dept Cent Res Inst Elect Power Ind Tokyo 2018511 Japan

ISBN: (纸本)0780366727

When lightning strikes bulk transmission lines or electric substations, large currents flow through towers or in substations and equipment structures before dissipating in the ground through the grounding systems. The electromagnetic fields generated by such lightning surges cause large currents and voltages, which may result in damage to equipment and serious accidents, such as failure of electrical transmission, and furthermore may be dangerous to personnel working nearby. Moreover, the immunity level of recent electronic equipment that contains semiconductors and LSI devices is low, and such equipment is sensitive to various types of electromagnetic stimuli. Therefore, it is important to analyze the transient behavior of grounding systems of power systems in order to study lightning protection and improve human safety. However. the transient behavior of grounding systems has so far been difficult to evaluate. In this paper, we propose a novel method in which the transient behavior is analyzed based on the finite-difference time-domain method, and confirm its validity through comparison between experimental results of the transient behavior and analytical results.

关键词： lightning protection human safety EMC grounding resistance transient phenomena simulation finite-difference time-domain method

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Numerical modelling of multi-dimensional liquid crystal optics: finite-difference time-domain method

Numerical modelling of multi-dimensional liquid crystal opti...

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VIIIth International Topical Meeting on Optics of Liquid Crystals (OLC 99)

作者： Kriezis, EE Elston, SJ Univ Oxford Dept Engn Sci Oxford OX1 3PJ England

Light wave propagation within complex liquid crystal structures is undertaken by the FDTD method, a purely numerical method that explicitly solves Maxwell's equations in space and time. A specific FDTD arrangement suitable for liquid crystal applications is described, allowing for efficient space termination, oblique angles of illumination, and correct phasor representation. Two application examples are considered: a two-domain twisted pixel formed by two oppositely twisted sub-domains, and a helical ferroelectric liquid crystal material. In each case comparison is also made with the optical prediction obtained by the Berreman method.

关键词： finite-difference time-domain method LC optics

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finite-difference time-domain analysis of band structures in one-dimensional Kerr-nonlinear photonic crystals

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OPTICS COMMUNICATIONS 2004年第1-3期239卷 213-222页

作者： Maksymov, IS Marsal, LF Pallarès, J Univ Rovira & Virgili Dept Engn Electron Elect & Automat Tarragona 43007 Spain

We present a new approach for analyzing band structures in one-dimensional Kerr-nonlinear photonic crystals. It combines the finite-difference time-domain method, based on the numerical simulation of oscillating dipole radiation, with the Kerr-nonlinear model. The approach is applied to analyze the band structures in Kerr-nonlinear one-dimensional photonic crystals as a function of the intensity of the oscillating dipole. We find that these bands are dynamically red-shifted with regard to the bands in linear one-dimensional photonic crystals. The proposed approach will help to understand such phenomena as intensity-driven optical limiting and all-optical switching with Kerr-nonlinear photonic crystals. (C) 2004 Elsevier B.V. All rights reserved.

关键词： one-dimensional nonlinear photonic crystal finite-difference time-domain method oscillating dipole band structure dynamic red-shift

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Analysis of guided modes in photonic crystal fibers using the finite-difference time-domain method

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第5期30卷 327-330页

作者： Qiu, M Royal Inst Technol Dept Electromagnet Theory S-10044 Stockholm Sweden

An efficient finite-difference time-domain method is proposed for the full-wave analysis of guided modes in photonic crystal fibers. The three-dimensional hybrid guided modes can be calculated by a two-dimensional mesh, if one assumes that the propagation constant along the z-direction (propagation direction) is fixed. Furthermore, only real variables are used in the present method. Therefore, the computation time and computer memory are significantly reduced. The results for a honeycomb-based silica-air photonic crystal fiber are in very good agreement with the results from the plane-wave expansion method. (C) 2001 John Wiley & Sons, Inc.

关键词： photonic crystal fibers finite-difference time-domain method photonic crystals

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finite-difference time-domain simulation of low-F# Fresnel zone plates coupled to IR antennas

Finite-difference time-domain simulation of low-F# Fresnel z...

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Conference on Electro-Optical and Infrared Systems

作者： Rico-García, JM López-Alonso, JM Lail, B Boreman, G Alda, J Univ Complutense Madrid Sch Opt Madrid 28037 Spain

ISBN: (纸本)0819455652

Fresnel Zone Plate Lenses (FZPLs) have been successfully coupled to infrared (IR) antennas producing a responsivity enhancement of about two orders of magnitude. However, their lateral extension may compromise their applicability in focal-plane-arrays (FPA) IR imagers, where the dimensions of the pixel are constrained by the FPA spacing. When designing optimum-gain FZPLs for FPAs, we are lead to the requirement of FZPLs operating at very low F/#s (marginal rays propagating at a large angle in image space). In this case, finite-difference time-domain techniques (FDTD) are used to refine the physical-optics modelling results, producing a result closer to the actual case encountered in a high-fill-factor FPA. In this contribution, we analyze the FZPL designs by using FDTD techniques. The main result of the FDTD computation is the gain factor defined as the ratio of the response of the IR antennas coupled with the FZPL, compared to the same antennas without the FZPL.

关键词： Antennas finite-difference time-domain method Silicon Computer generated holography Infrared imaging Staring arrays Semiconducting wafers Zone plates Computer simulations Infrared radiation

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Numerical modelling of multi-dimensional liquid crystal optics: finite-difference time-domain method

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MOLECULAR CRYSTALS AND LIQUID CRYSTALS 2001年 359卷 609-619页

作者： Kriezis, EE Elston, SJ Univ Oxford Dept Engn Sci Oxford OX1 3PJ England

关键词： finite-difference time-domain method LC optics

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finite-difference time-domain analysis of ultrashort laser pulse propagation in a fiber with nonlinear effects

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 2004年第5期87卷 1-10页

作者： Nakamura, S Koyamada, Y Karasawa, N Sone, H Morita, R Yamashita, M Ibaraki Univ Dept Media & Telecommun Engn Hitachi Ibaraki 3168511 Japan Japan Sci & Technol Corp Core Res Evolut Sci & Technol Promot Kawaguchi 3320012 Japan Chitose Inst Sci & Technol Fac Photon Sci Chitose 0668655 Japan Kitami Inst Technol Fac Engn Kitami Hokkaido 0908507 Japan Hokkaido Univ Dept Appl Phys Sapporo Hokkaido 0618628 Japan

As a method of analyzing the nonlinear propagation of light, the Sellmeier equation for fused silica with three resonant frequencies is used and a finite-difference time-domain method taking the Raman response into account is proposed. The numerical results are compared with experimental results for optical pulses with a pulse width of 12 fs passing through a fused silica fiber. By this method of analysis, the numerical results are compared with those obtained by the conventional split-step Fourier method and it is found that these results are closer to the experimental results. (C) 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1 ,87(5): 1-10, 2004;Published online in Wiley InterScience (***). DOI 10.1002/ ecja.10166.

关键词： finite-difference time-domain method optical fiber nonlinear optics femtosecond Raman Sellmeier equation

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Higher-order finite-difference schemes with reduced dispersion errors for accurate time-domain electromagnetic simulations

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 2004年第5期17卷 461-486页

作者： Zygiridis, TT Tsiboukis, TD Aristotle Univ Thessaloniki Dept Elect & Comp Engn Appl & Computat Electromagnet Lab GR-54124 Thessaloniki Greece

The potential for developing higher-order finite-difference time-domain (FDTD) schemes with reduced phase errors is investigated in the present paper. Using the classic (2,4) FDTD method as the basis of this study, electromagnetic wave propagation is accurately reproduced in the discretized space by replacing isotropic materials with modified, anisotropic in general, ones. The use of such artificial materials improves the simulation's precision significantly around a specific frequency, yet the overall error remains small at a considerably wide bandwidth;therefore, this algorithm can be useful for wideband problems as well. Additionally, it is shown that an even better single-frequency performance can be attained, when the modified materials are combined with systematically calculated spatial operators. Pursuing a more wideband enhancement of the (2,4) technique, a version realizing more accurate results at almost all frequencies that can be coupled in a staggered grid is derived. Furthermore, novel spatial operators are introduced, with the distinct feature of using extended stencils in more than one directions. It turns out that when such operators are incorporated, a scheme that combines the aforementioned features can be obtained. The theoretical findings of this investigation are verified in a sequence of numerical tests, involving free-space and guided-wave propagation, as well as the determination of a cavity's resonant frequencies. Copyright (C) 2004 John Wiley Sons, Ltd.

关键词： finite-difference time-domain method higher-order schemes numerical dispersion optimized schemes

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Algorithm analysis on MMW dosimetry for the cell monolayer cultured in Petri dish with the FDTD method

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INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES 2004年第5期25卷 759-774页

作者： Zhao, JX Zhang, HK Liui, DG Lu, DQ Xidian Univ Sch Elect Engn Dept Biomed Engn Xian 710071 Peoples R China

Four algorithms are developed to help the dosimetry study for experiments on millimeter-wave (MMW) biological effects on cells in vitro with the finite-difference time-domain (FDTD) method. Their performances in evaluating the MMW irradiation dose are displayed and compared, including the induced current density and the specific absorption rate (SAR), that are distributed over the cell monolayer cultured in Petri dish. With the discussion on individual characteristics of the algorithms, the conclusion is reached that an appropriate algorithm is essential in providing accurate data on the MMW irradiation dose by way of numerical calculation, which should be considered carefully in related experiments.

关键词： millimeter wave dosimetry cell monolayer Petri dish finite-difference time-domain method

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