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Numerical simulation on read-out characteristics of the planar aperture-mounted head with a minute scatterer

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2001年第3B期40卷 1542-1547页

作者： Tanaka, K Ohkubo, T Oumi, M Mitsuoka, Y Nakajima, K Hosaka, H Itao, K Univ Tokyo Grad Sch Frontier Sci Bunkyo Ku Tokyo 1138656 Japan Seiko Instruments Inc Matsudo Chiba 2702222 Japan

Recently, various researches on optical recording based on near-field optical principles have been conducted for higher data storage density. However, there is a problem of the trade-off between signal output and spatial resolution, especially when an aperture-type near-field optical head is utilized for high speed data-readout. In order to solve this problem, we propose a novel near-field optical head, the planar aperture-mounted head with a minute scatterer. and analyze its read-out performance through the three-dimensional finite-difference time-domain (3D-FDTD) method. Our simulations reveal that the Silver scatterer placed at the center of the planar aperture strongly enhances optical energy due to the local surface plasmon excitation, and that this head has the potential to realize high resolution and high signal output simultaneously.

关键词： near-field optics near-field optical head scatterer plasmon excitation finite-difference time-domain method

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Numerical modeling and experimental investigation of resonance properties of microwave capacitors

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第1期29卷 54-60页

作者： Semouchkina, E Cao, WW Mittra, R Lanagan, M Penn State Univ Mat Res Lab University Pk PA 16802 USA Penn State Univ Dept Math University Pk PA 16802 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA

The finite-difference time-domain (FDTD) field simulations have been employed to visualize standing-wave patterns in single-layer, rectangular, planar capacitors and capacitor chips. These patterns are used for the analysis of the resonant mode types, and for the determination of the resonance frequencies. The results of simulation are experimentally verified by measuring the S-parameter spectra. In addition, we show that the dimensions of the capacitor plates can be optimized in order to maximize the first resonant frequency of the capacitor, rendering it useful for high-frequency applications. (C) 2001 John Wiley & Sons, Inc.

关键词： microwave capacitors finite-difference time-domain method

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Numerical analysis of optical modes in two-dimensionally ordered polystyrene spheres in attenuated total reflection geometry

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2001年第4A期40卷 2286-2291页

作者： Haraguchi, M Fukui, M Nakai, T Okamoto, T Shinya, A Koda, T Shimada, R Ohtaka, K Univ Tokushima Fac Engn Dept Opt Sci & Technol Tokushima 7708506 Japan Japan Womens Univ Fac Sci Dept Math & Phys Bunkyo Ku Tokyo 1128681 Japan Chiba Univ Fac Engn Dept Appl Phys Inage Ku Chiba 2638522 Japan

We have numerically calculated attenuated total reflection (ATR) signals due to two-dimensionally ordered (2D) spheres on a glass substrate for both TE- and TM-polarized incident light beams using a finite difference time-domain method. The calculated ATR spectra are in good agreement with the experimental ones reported previously by Lis. From the ATR spectra and the spatial distribution of light intensity, it has been found that the ATR dips are due to the excitation of the optical modes in the 2D spheres. The propagation length of the optical modes is confirmed to be comparable to the diameter of the sphere. It indicates that the optical modes propagate in a variety of fashions and the light intensity in the 2D spheres takes a maximum value at the contact points between the spheres.

关键词： ordered spheres microsphere light propagation light coupling gallery mode evanescent light attenuated total reflection finite-difference time-domain method

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Combining FDTD simulations with measurements of microstrip ring resonators for characterization of low- and HIGH-K dielectrics at microwaves

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2001年第1期29卷 21-24页

作者： Semouchkina, E Cao, WW Lanagan, M Mittra, R Yu, WH Penn State Univ Mat Res Lab University Pk PA 16802 USA Penn State Univ Dept Math University Pk PA 16802 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA

This paper shows how the dielectric constant of alumina and rutile substrates at microwave frequencies can be accurately determined by fitting the simulated S-parameter spectra of microstrip ring resonators, generated via the finite-difference time-domain (FDTD) method, to experimentally measured data. The proposed method does not require the determination of the effective dielectric constant and the approximate closed-form expressions to find the true permittivity of the substrate. This is essential for the characterization of high-K dielectric materials at high frequencies when the closed-form expressions are invalid. (C) 2001 John Wiley & Sons, Inc.

关键词： finite-difference time-domain method dielectric characterization microwave measurements microstrip ring resonator

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EM wave simulation: An animated electromagnetic wave teaching package

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COMPUTER APPLICATIONS IN ENGINEERING EDUCATION 2001年第4期9卷 208-219页

作者： Leung, WK Chen, YC Lee, YS Hong Kong Polytech Univ Dept Elect & Informat Engn Hong Kong Hong Kong Peoples R China Univ S Carolina Dept Elect Engn Columbia SC 29208 USA

This paper describes EM Wave Simulation, a windows-based animated electromagnetic wave simulation package, developed as a supplementary tool for teaching electromagnetic field theory at the undergraduate level, For the purpose of rapid display of electromagnetic wave images, the implemented algorithm assumes a structure sandwiched between two perfect electric conductor planes and employs a 2(1)/(2)-dimensional finite-difference time-domain (FDTD) method on a staggered grid, which is suitable for simulating simplified electromagnetic wave propagation in indoor environments. Frequency-domain spectral information can be extracted with the built-in one- and two-dimensional discrete Fourier transforms facilities. A user-friendly mouse-and-menu-driven interface allows user to set up simulations containing complex geometries in a straightforward fashion. Simulated results, in both time and frequency domains, can be displayed in real-time on the computer screen, which makes the application ideal for use in interactive undergraduate teaching. Some sample simulations are discussed in the paper to illustrate its principal functionality. (C) 2002 Wiley Periodicals, Inc.

关键词： applied electromagnetics finite-difference time-domain method animation visualization

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Validation of the finite-difference time-domain method for near-field bioelectromagnetic simulations

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Microwave and Optical Technology Letters 1998年第6期16卷

作者： Cynthia M. Furse Quishan Yu Om P. Gandhi Department of Electrical Engineering University of Utah Salt Lake City Utah 84112

Validations of the accuracy of the FDTD method for near-field simulations are critical at this time to assess the accuracy of the FDTD method for the simulation of personal communication devices. Excellent comparisons between the FDTD method and analytical or measured results are shown for a dipole antenna next to a layered half-space, a layered box, and a sphere, and also an infinitesimal dipole near a sphere. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 341–345, 1997.

关键词： finite-difference time-domain method bioelectromagnetic simulations near-field simulations

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Comparison of scattering parameter calculations using touchstone and a full-wave electromagnetic solver based upon the finite-difference time-domain method

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Microwave and Optical Technology Letters 1998年第6期15卷

作者： S. Kosanovich R. Mittra Electromagnetic Communication Laboratory University of Illinois at Urbana–Champaign Urbana Illinois 61801

Scattering parameter results for various types of microstrip circuit configurations have been calculated using a full-wave electromagnetic solution technique. A full-wave electromagnetic solution technique is the most robust since it accounts for all coupling mechanisms present in a given geometry. The method is based upon the finite-difference time-domain (FDTD) method. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 347–352, 1997.

关键词： microstrip circuits full-wave analysis electromagnetic solver finite-difference time-domain method microstrip discontinuities

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Characteristics of eccentric coaxial line using conformal mapping and finite-difference time-domain method

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Microwave and Optical Technology Letters 1998年第4期16卷

作者： Zhou Xiaojun Yu Zhiyuan Lin Weigan University of Electronic Science and Technology of China Chengdu 610054 P.R. China

This paper presents a general group of formulas by a combination of conformal mapping and 2-D FDTD (CF–FDTD). By this new method, the cutoff wavenumbers and dispersive characteristics of higher order TE modes in an eccentric coaxial line are given. A comparison of numerical results is presented. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 249–252, 1997.

关键词： finite-difference time-domain method coaxial line conformal mapping

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Simulation of human interaction with mobile telephones using hybrid techniques over coupled domains

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 2000年第11期48卷 2014-2021页

作者： Mangoud, MA Abd-Alhameed, RA Excell, PS Univ Bradford Ctr Telecommun Res Bradford BD7 1DP W Yorkshire England

An approach to hybridization of the method of moments and the finite-difference time-domain method is investigated in this paper. This hybrid method is capable of analyzing a system of multiple discrete regions by employing the principle of equivalent sources to excite their coupling surfaces. The case of multiple sources in the presence of scattering objects is discussed. To develop the approach and test its validity, some examples are given using the same numerical method in multiple regions: the results compare well with other available data, The theory of the heterogeneous hybrid method is then developed and validated. It is shown that this technique has the great advantage of accurately modeling complex and arbitrarily oriented mobile telephone handset antennas in the proximity of a detailed voxel representation of the human head, as required for safety and radiation pattern assessments.

关键词： bioelectromagnetics computational electromagnetics finite-difference time-domain method hybrid methods method of moments mobile telephones safety

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Analysis of photonic crystal filters by the finite-difference time-domain technique

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2000年第2期27卷 81-87页

作者： Wu, BI Yang, E Kong, JA Oswald, JA McIntosh, KA Mahoney, L Verghese, S MIT Elect Res Lab Cambridge MA 02139 USA Harvard Univ Dept Phys Cambridge MA 02138 USA MIT Lincoln Lab Lexington MA 02173 USA

A special finite-difference time-domain (FDTD) formulation oblique incidence for periodic media is used for the design and analysis of an infrared photonic crystal filter with dual stopbands at 3-5 and 8-12 mu m. The transmission coefficients in the main stopband (8-12 mu m) is below - 10 dB. Scattering coefficients are calculated for different incidence angles, and the stopbands are shown to exist for different angles of incidence. (C) 2000 John Wiley & Sons, Inc.

关键词： photonic crystal filters periodic structures finite-difference time-domain method

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