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5th International Symposium on Instrumentation Science and Technology

作者： Iwami, Kentaro Ono, Takahito Esashi, Masayoshi Tokyo Univ Agr & Technol Div Adv Mech Syst Engn 2-24-16 Nakacho Koganei Tokyo 1840012 Japan Tohoku Univ Dept Nanomech Sendai Miyagi 9808579 Japan Tohoku Univ Adv Inst Mat Res Sendai Miyagi 9808579 Japan

ISBN: (纸本)9780819473677

This paper reports design, fabrication and evaluation of a novel scanning near-field probe for terahertz (THz) local time domain spectroscopy (THz-TDS). A microfabricated scanning near-field optical microscopy (SNOM) probe was assembled with a low-temperature-grown gallium arsenide (LT-GaAs) photoconductive antenna. The probe structure was evaluated and determined by a finite-difference time-domain (FDTD) numerical simulation. The assembly was used as the THz emitter and local THz source. Another LT-GaAs antenna situated at the opposite side was used as the detector. A THz-TDS measurement using the microfabricated SNOM probe and photoconductive antenna was performed.

关键词： Microelectromechanical Systems (MEMS) Terahertz Scanning Near-Field Optical Microscopy Terahertz time-domain Spectroscopy Gallium arsenide finite-difference time-domain method

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Analysis of surface plasmon resonance with Goos-Hanchen shift using FDTD method

Analysis of surface plasmon resonance with Goos-Hanchen shif...

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Conference on Integrated Optics - Devices, Materials, and Technologies XIII

作者： Oh, Geum-Yoon Kim, Doo-Gun Kim, Hong-Seung Choi, Young-Wan Chung Ang Univ Sch Elect & Elect Engn 221 Heuksuk Dong Seoul 156756 South Korea Korea Photon Technol Inst Photon Device Team Gwangju 500460 South Korea

ISBN: (纸本)9780819474643

The Goos-Hanchen (GH) shift is observed from phase transition of the reflected light. However, the reported Artmann's equation is difficult to apply to drastic phase change of the critical and resonance angles because this equation is solved by differential of the phase shift. Therefore, the GH shift can be obtained from the structure optimized by the finite-difference time-domain method. In the surface plasmon resonance (SPR) phenomenon, positive and negative lateral shifts may result from the variation of incidence angle. The GH shift is very important to exactly detect the output power of the micro-size SPR sensor. The accurate positive and negative lateral shifts of -0.49 and +1.46 mu m are obtained on the SPR with the incidence angles of 44.4 degrees and 47 degrees, respectively.

关键词： Goos-Hanchen shift finite-difference time-domain method Sensor Surface plasmon resonance

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Evolution of near-field electromagnetic interference by metallic nano-structures

Evolution of near-field electromagnetic interference by meta...

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Conference on Physics and Simulation of Optoelectronic Devices XVII

作者： Kim, Jaehyuk Lee, Kewseung An, Honggyu Jeang, Eunhee Kim, Daegeun Doh, Hyeonjin Shin, Dong-Soo Park, Seung-Han Yonsei Univ Inst Phys & Appl Phys Seoul 120749 South Korea Hanyang Univ Dept Appl Phys Ansan 426791 Gyeonggi Do South Korea

ISBN: (纸本)9780819474575

We investigate the intensity and amplitude distributions through a nano double-slit and a nano double-box by the two-dimensional finite-difference time-domain method based on Drude model. In particular, we find that there is an 'intermediate region' between the near-field and far-field regions, which vary with thickness and width of the double-slit. Here, we describe the local fields and intensities propagating along and perpendicular to metal surface and their spatial distributions to verify the existence of the intermediate region.

关键词： metallic nano double slit metallic nano double box finite-difference time-domain method Drude Model

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Ray-tracing technique and imaging properties by a PC slab with n_eff=-1

Ray-tracing technique and imaging properties by a PC slab wi...

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International Conference on Optical Instruments and Technology - Microelectronic and Optoelectronic Devices and Integration

作者： Wang, Y. Chen, Jiabi Qian, W. Shanghai Univ Sci & Technol Coll Opt & Elect Informat Engn Shanghai 200093 Peoples R China

ISBN: (纸本)9780819474025

In recent years, negative refractive media as the representation of new electromagnetic medium has become the front and the very popular researching field, and the production of the flat lens is one of its major applications. In our study, the imaging behaviors by two-dimensional photonic crystal slabs have been investigated systematically. We suggest a ray-tracing technique to discuss the action of photonic crystal slab with negative refraction. The propagation of electromagnetic waves in two-dimensional hexagonal lattice photonic crystal slab is investigated through dispersion characteristics analysis and numerical simulation of field patterns. Imaging and focusing with effective negative refractive index of -1 have been observed in these systems for both polarized waves, that is TE- and TM-polarized point source be considered simultaneously. Based on the exact finite-difference time-domain method to perform numerical simulation and physical analysis, we have demonstrated that the two-dimensional photonic crystal we designed can realize nearly perfect imaging with TM-polarized point source in the near field and far field, and the results are consistent with the ray-tracing technique quite well, while to TE-polarized point source the imaging is not perfect although it have n(eff)=-1 in the same direction.

关键词： negative refraction photonic crystal finite-difference time-domain method

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Cherenkov Radiation and Photonic Crystals

Cherenkov Radiation and Photonic Crystals

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Conference on Photonic and Phononic Crystal Materials and Devices IX

作者： Gauthier, Robert C. Carleton Univ Ottawa ON K1S 5B6 Canada

ISBN: (纸本)9780819474698

A charge moving faster than the phase velocity in a medium can produces conical radiation known as Cherenkov radiation. The FDTD numerical technique is used to model this radiation process and the generated light spectrum is used to explore the optical properties of photonic crystal and quasi-crystals. It is shown that the radiation from the fast moving charge is able to provide information on the band gap and transmission spectrums, defect state wavelengths and waveguide propagation.

关键词： Photonic crystals Dielectrics Waveguides finite-difference time-domain method Cerenkov radiation imaging Wavefronts Wave propagation Light wave propagation Phase velocity Polarization

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Metal-Interface Second Harmonic Generation from Pt/Cu Bimetallic Nanowire Arrays on NaCl(110) Faceted Templates

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E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2009年 7卷 831-835页

作者： Than, Nguyen Anh Mizutani, Goro Japan Adv Inst Sci & Technol Sch Mat Sci 1-1 Asahidai Nomi Ishikawa 9231292 Japan

We have obtained the azimuthal angle dependence of the second harmonic (SH) intensity from bimetallic Pt/Cu and Pt/SiO/Cu nanowire arrays. The arrays were fabricated by shadow deposition on NaCl(110) faceted templates. The SH intensity from the Pt/Cu nanowire array measured in S-in/S-out polarization combination were 4.7 times larger than that from the Pt/SiO/Cu nanowire array at the fundamental photon energy of 2.33 eV. Phenomenological analysis of the intensity patterns and numerical calculation of the local fields have shown that the inversion symmetry broken at the metal-metal interface is responsible for the enhanced SH generation from the Pt/Cu bimetallic nanowire arrays.

关键词： Metal-Interface Second harmonic generation Bimetallic nanowire finite-difference time-domain method Copper Platinum NaCl(110)

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DISTORTION OF PULSED INPUT SIGNAL IN finite-difference time-domain GRID

DISTORTION OF PULSED INPUT SIGNAL IN FINITE-DIFFERENCE TIME-...

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4th International Conference on Ultrawideband and Ultrashort Impulse Signals

作者： Soldatenkov, V. P. Yurtsev, O. A. Byelorussian State Univ Informat & Radioelect Minsk BELARUS

We consider propagation of pulsed input signals in finite-difference time-domain grid. Factors that influence upon these signals distortion have been analyzed. Relatively simple finite-difference time-domain computing... 详细信息

ISBN: (纸本)9781424427383

关键词： finite-difference time-domain method integral equation method pulsed input signal amplitude-frequency characteristic

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finite difference time domain model of light scattering from retinal photoreceptors

Finite Difference Time Domain model of light scattering from...

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Conference on Biomedical Applications of Light Scattering II

作者： Abdallah, Samer Iolov, Alex Ramahi, Omar M. Bizheva, Kostadinka Univ Waterloo Dept Phys & Astron Waterloo ON N2L 3G1 Canada Univ Waterloo Dept Elect & Comp Engn Waterloo ON Canada

ISBN: (纸本)9780819470393

Functional ultra high resolution optical coherence tomography (fUHROCT) was used to non-invasively probe the functional response of retinal photoreceptors. Using this technique, time dependent changes in light reflectivity of the retinal photoreceptor layer were measured after external white light stimulation. The causes of the observed changes are currently not known. To better understand the observed reflectivity signals, we have developed a computational model based on the finite-difference time-domain method to simulate light scattering from retinal neurons. Preliminary simulation results suggest that cell dynamics and cell volume changes are the likely causes of the observed signals.

关键词： Light scattering finite-difference time-domain method Refractive index Signal detection Reflectivity Retina Scattering Optical properties Optical coherence tomography Tissues

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Applications of electromagnetic models of the lightning return stroke

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IEEE TRANSACTIONS ON POWER DELIVERY 2008年第2期23卷 800-811页

作者： Baba, Yoshihiro Rakov, Vladimir A. Doshisha Univ Dept Elect Engn Kyoto 6100321 Japan Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA

Lightning return-stroke models are needed to study lightning effects on various objects and systems, as well as in characterizing the lightning electromagnetic environment. Reviewed here are models based on Maxwell's equations and referred to as electromagnetic models. In contrast to distributed-circuit and so-called engineering models, electromagnetic models of the lightning return stroke allow a self-consistent full-wave solution for both current distribution along the lightning channel and associated electromagnetic fields. In this paper, we review electromagnetic models with an emphasis on their applications.

关键词： electromagnetic field finite-difference time-domain method lightning lightning return-stroke model method of moments

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Analysis and design of sub-wavelength resonant cavity type 2-D leaky-wave antennas

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2008年第9期56卷 2817-2825页

作者： Kelly, James R. Kokkinos, Titos Feresidis, Alexandros P. Univ Loughborough Dept Elect & Elect Engn Wireless Commun Res Grp Loughborough LE11 3TU Leics England

A rigorous analysis is presented together with novel designs of high-gain sub-wavelength resonant cavity antennas. The antennas under investigation are formed by partially reflective surfaces placed in close proximity over artificial periodic metamaterial ground planes with specific reflection phase responses. A fullwave periodic leaky-wave analysis is applied to this class of antennas for the first time and the results are reported and discussed. finite-size antenna designs are studied at wireless LAN frequencies (3.7 GHz) using 3-D full-wave software and the results are compared to the predictions of the leaky-wave analysis. Furthermore, the field distribution and the effect of losses are investigated. Finally, practical designs of sub-wavelength 2-D leaky-wave antennas with high-gain performance are presented.

关键词： artificial magnetic conductor finite-difference time-domain method high-gain antennas leaky-wave antennas (LWAs) resonant cavities sub-wavelength resonators

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