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Conference on Integrated Optics - Devices, Materials and Technologies IX

作者： Deustch, M Hasegawa, K Nöckel, JU Univ Oregon Dept Phys Eugene OR 97103 USA

ISBN: (纸本)0819457027

We present an analytical study of surface plasmon polariton (SPP) propagation about a circular bend formed by the interface between a metal and a dielectric with the metal occupying the inner volume. It is shown that in the short wavelength limit, the problem is essentially analogous to scattering from a ID finite potential well, with standard expressions for the transmittance and reflectance. In certain cases, we find that propagation on nonplanar interfaces may result in lower losses than on flat surfaces, contrary to expectation. We also show that the same approach is valid when the metal occupies the outer volume, such that in the ID approximation SPPs propagating around such bends do not radiate. An upper bound for the transmittance, valid even when our approximation breaks down, is also derived. This is found to depend nonmonotonically on the bend radius, allowing increased transmission with decreasing radius. We further present a numerical study using the finite-difference time-domain method and show that it is consistent with theoretical predictions. We also show that the introduction of a microcavity plasmon resonator could significantly enhance the transmission.

关键词： surface plasmon polariton waveguide bend loss mode matching finite-difference time-domain method microcavity

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Far-field optical response of localized near-field enhancements induced by nano scatters in AgO_x super-resolution near-field structure

Far-field optical response of localized near-field enhanceme...

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Conference on Advances in Optical Data Storage Technology

作者： Chu, TC Liu, WC Tsai, DP Natl Taiwan Univ Ctr Nanostorage Res Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The super-resolution near-field structure (super-RENS) is an ultrahigh-density near-field optical disk data storage medium which can achieve superior spatial resolution. Our previous studies found that enhanced local optical intensity occurred at the near field of the super-RENS disk, and the nonlinear near-field optical enhancement is related to the localized surface plasmons of silver clusters dissociated from the AgOx layer of the super-RENS disk. In this paper, we report the near-field and far-field properties of AgOx-type super-RENS with different embedded silver nanoparticles using two-dimensional finite-difference time-domain (FDTD) calculations. Highly localized enhancements are found between adjacent silver nanoparticles in the near fields. The far-field signals of different types silver nano scatters confirm the super-resolution capability of AgOx-type Super-RENS disks. The behaviors of far-field signals indicate the correlation between the enhanced localized surface plasmons and the super-resolution capabilities of AgOx-type super-RENS.

关键词： localized surface plasmon super-resolution near-field structure near-field optical storage optical disks finite-difference time-domain method metallic nanoparticles

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Compact single air interface bends in PFCB polymer waveguides

Compact single air interface bends in PFCB polymer waveguide...

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Conference on Integrated Optics - Devices, Materials and Technologies IX

作者： Cardenas, J Kim, S Cai, J Nordin, GP Univ Alabama Nano & Micro Devices Ctr Huntsville AL 35899 USA

ISBN: (纸本)0819457027

Compact waveguide bends and splitters are important components to enable dense integration of many functions on a single photonic chip. A common approach is to use a waveguide material system in which a large refractive index contrast between the core and clad materials is available. This permits a small bend radius to be used while still achieving high optical efficiency for the bend. However, such material systems generally have higher propagation loss than is possible with low refractive index contrast material systems such as silica. In this presentation we examine an approach to make the bend size essentially independent of the core/clad refractive index contrast using total internal reflection from a planar interface. We show through both 2D and 3D finite difference time domain (FDTD) simulation that very high bend efficiencies are possible when the correct bend design principles are adhered to. We illustrate this in practice with single air interface bends (SAIBs) in a PFCB material system with approximately 1% refractive index contrast. We experimentally demonstrate 45 degree bends with 0.3 dB loss per bend, and discuss the effects of fabrication issues such as misalignment, etch undercut, and etch roughness.

关键词： Waveguides Interfaces Refractive index Etching finite-difference time-domain method Polymers Waveguide modes Polymer multimode waveguides Wave propagation Photonic crystals

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Causal parameter extractions by vector fitting for use in time-domain numerical modeling

Causal parameter extractions by vector fitting for use in ti...

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2005 IEEE Antennas and Propagation Society International Symposium and USNC/URSI Meeting

作者： Shuiping, Luo Zhizhang, Chen Department of Electrical and Computer Engineering Dalhousie University Halifax NS B3J 2X4 Canada

No abstract available

ISBN: (纸本)0780388836

No abstract available

关键词： approximation theory convolution lumped parameter networks network parameters semiconductor device models time-domain analysis CPU time saving factor causal parameter extraction coefficient extraction technique finite-difference time-domain method freque

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Design tips of nanoapertures with strong field enhancement and proposal of novel L-shaped aperture

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OPTICAL ENGINEERING 2005年第1期44卷 9-9页

作者： Xu, JY Xu, TJ Wang, J Tian, Q Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Dept Precis Instruments Beijing 100084 Peoples R China

We summarize some design tips and design procedures of nanoapertures with strong field enhancement, based on the theoretical calculations and analyses of near-field distributions of unconventional C apertures and bow-tie apertures by a finite-difference time-domain method. A novel L-shaped aperture is proposed and further validates the proposed design rule. As a result, a 15x15-nm full width half maximum spot forms in the light exit plane of the L aperture. Its intensity maximum enhancement reaches a factor of about 568 and the power throughput is bigger than unity. The mechanisms of electromagnetic field enhancement are preliminarily analyzed. This unconventional nanoaperture is likely to be directly used as an exit aperture of very small aperture lasers, or as an unattached shield, to produce a subwavelength light source with high transmission. (C) 2005 Society of Photo-Optical Instrumentation Engineers.

关键词： near-field optics nanoaperture field enhancement finite-difference time-domain method

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time-domain analysis of the effects of reinforced concrete wall on short path propagation of electromagnetic pulses

Nanjing Youdian Xueyuan Xuebao/Journal of Nanjing Institute ...

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Nanjing Youdian Xueyuan Xuebao/Journal of Nanjing Institute of Posts and Telecommunications 2005年第6期25卷 12-16页

作者： Qin, Wei-Ping Ding, Sheng-Gao Zhang, Ye-Rong College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

The short path propagation of an electromagnetic pulse generated numerically from a wideband conical monopole antenna through reinforced concrete wall of buildings has been studied in the time-domain using the finite-difference time-domain (FDTD) method. Computational results demonstrated the effects of the reinforced concrete wall on pulse signal propagation including the pulse waveform distortion made of transmitting antenna, field distribution when pulse propagating through wall, reflection of pulse peak and pulse waveform reflected from and transmitted through reinforced concrete wall.

关键词： Electromagnetic pulse propagation finite-difference time-domain method Reinforced concrete wall Ultra-wideband communication

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

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MOLECULAR CRYSTALS AND LIQUID CRYSTALS 2001年第1期359卷 609-619页

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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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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