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Conference on Photonic Crystal Materials and Devices

作者： Soljacic, M Ibanescu, M Luo, CY Johnson, SG Fan, SH Fink, Y Joannopoulos, JD MIT Dept Phys Cambridge MA 02139 USA

We demonstrate optical bistability in a class of non-linear photonic crystal devices, through the use of detailed numerical experiments, and analytical theory. Our devices are shorter than the wavelength of light in l... 详细信息

ISBN: (纸本)0819448001

关键词： Bistability Nonlinear optics Photonic crystals Optical fibers Waveguides Modulation Cladding finite-difference time-domain method Optical spheres

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Bistability in a non linear grating: a FD-TD approach

Bistability in a non linear grating: a FD-TD approach

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19th Congress of the International-Commission-for-Optics

作者： Saccomandi, L Fogli, F Bassi, P Bellanca, G Trillo, S Univ Bologna Dipartimento Elettron Informat & Sistemist DEIS I-40136 Bologna Italy

ISBN: (纸本)0819445967

The transmission properties of a one-dimensional grating with a Keff non linearity, at operating frequencies close to the upper edge of the stop-band, have been investigated using the finite difference time domain (FD-TD) technique. Results show that the structure exhibits a bistable behavior: transitions from strong reflection to nonlinearity-induced transparency and viceversa are found, leading to high-intensity field. localization within the grating. In the limit of shallow gratings, FD-TD results are in good agreement with those based on coupled-mode theory (CMT).

关键词： Bistability Transmittance finite-difference time-domain method Transparency Fiber Bragg gratings Kerr effect Nonlinear optics Optical components Physics Transient nonlinear optics

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A framework for macromodeling and mixed-mode simulation of circuits/interconnects and electromagnetic radiations

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2003年第2期E86A卷 252-261页

作者： Watanabe, T Asai, H Univ Shizuoka Sch Adm & Informat Shizuoka 4228526 Japan Shizuoka Univ Fac Engn Dept Syst Engn Hamamatsu Shizuoka 4328651 Japan

This paper presents a framework for modeling and mixed-mode simulation of circuits/ interconnects and electro-magnetic (EM-) radiations. The proposed framework investigates the signal integrity in VLSI chips, packages and wiring boards at the GHz-band level, and verifies the electromagnetic interference (EMI) and the electromagnetic compatibility (EMC) of high-speed systems. In our framework, the frequency characteristics of interconnects and EM-radiations are extracted by the full-wave FDTD simulation. The macromodels of interconnects are synthesized as SPICE subcircuits, and the impulse responses of EM-radiations are stored in the database. Once the macromodels are synthesized, the circuit simulation with the consideration of EM-effects can be performed by using SPICE. The EM-field distributions can be also easily calculated by taking convolutions of pre-simulated EM impulse responses and the SPICE results.

关键词： analog circuit simulation SPICE macromodel electromagnetic radiations finite-difference time-domain method

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High spatial resolution and throughput potential of an optical head with a triangular aperture for near-field optical data storage

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2003年第2B期42卷 1113-1117页

作者： Tanaka, K Oumi, M Niwa, T Ichihara, S Mitsuoka, Y Nakajima, K Ohkubo, T Hosaka, H Itao, K Univ Tokyo Grad Sch Frontier Sci Bunkyo Ku Tokyo 1138656 Japan Seiko Instruments Inc Chiba 2702222 Japan Toyo Univ Fac Engn Kawagoe Saitama 3508585 Japan

A near-field optical head with a triangular aperture has been precisely analyzed. on the basis of a three-dimensional finite-difference time-domain method in order to obtain both higher spatial resolution and signal output performance for a near-field optical data storage system. The numerical analysis revealed that in contrast to a conventional aperture, this triangular-shaped aperture can successfully enhance energy distribution intensity at only the side perpendicular to the incident polarization direction, generating an extremely small optical spot not limited by its entire aperture,size. The read-out performance was also simulated for the aperture passing over a space-patterned metal. medium, resulting in both superior spatial resolution and signal output.

关键词： near-field optics near-field optical head triangular aperture finite-difference time-domain method

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Lifetime of optical modes in two dimensionally ordered spheres

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 2002年第1期41卷 149-154页

作者： Haraguchi, M Fukui, M Okamoto, T Shinya, A Univ Tokushima Fac Engn Dept Opt Sci & Technol Tokushima 7708506 Japan

We have numerically calculated the lifetimes of optical modes, e.g., a propagating mode, in two-dimensionally (2D) ordered spheres on a glass substrate using a finite-difference time-domain method. The lifetimes of the optical modes excited by the evanescent light in an attenuated total reflection (ATR) geometry are much shorter than those excited by a light source embedded in the 2D ordered spheres on substrates. The spatial distributions of the light intensity associated with the optical modes excited in the ATR geometry are found to be different from those in the case of the embedded light source. The light energy of the optical modes excited in the ATR geometry flows extending over the entire the respective spheres and thus can be easily coupled out through the prism. On the other hand, the light energy associated with the optical modes excited by the embedded light source flows straight around the central axis of spheres, leading to a longer life time.

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

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Ultrashort bragg soliton in a fiber bragg grating

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OPTICS COMMUNICATIONS 2002年第1-3期206卷 115-121页

作者： Chi, S Luo, B Tseng, HY Natl Chiao Tung Univ Inst Electroopt Engn Hsinchu 300 Taiwan

The propagation of a nonlinear ultrashort pulse in a photonic bandgap structure is investigated by using the finite-difference time-domain method. The simulation results show that an ultrashort pulse near the bandgap edge can propagate through a nonlinear fiber Bragg grating, even if the broadband spectrum of this ultrashort pulse overlaps the whole forbidden band of the grating. It is also shown that the time delay of such an ultrashort solitary wave is proportional to its detuning wavelength from the exact Bragg resonance. (C) 2002 Published by Elsevier Science B.V.

关键词： finite-difference time-domain method photonic bandgap Bragg soliton gap soliton fiber Bragg grating

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Analysis of upsets and failures due to ESD by the FDTD-INBCs method

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2002年第4期38卷 1009-1017页

作者： Maradei, F Raugi, M Univ Roma La Sapienza Dept Elect Engn I-100184 Rome Italy Univ Pisa Dept Elect Engn & Automat I-56126 Pisa Italy

In this paper, a finite-difference time-domain (FDTD) model of an electrostatic discharge (ESD) event is developed. Analytical expressions for the field radiated during the ESD discharge phase have been determined to test the FDTD model of the strike arc. In order to take into account the electromagnetic field penetration through shielding structures, the conductive panels are efficiently modeled in the FDTD by the impedance network boundary conditions (INBCs). The FDTD-INBCs method avoids the huge amount of cells needed to model accurately the penetration in the traditional FDTD algorithm based on the utilization of the regular Yee grid. The method is applied to the analysis of ESD events in some configurations.

关键词： electrostatic discharge finite-difference time-domain method impedance network boundary conditions

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A virtual optical probe based on evanescent wave interference

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CHINESE PHYSICS 2002年第10期11卷 1022-1027页

作者： Sun, LQ Wang, J Hong, T Tian, Q Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

A virtual probe is a novel immaterial tip based on the near-field evanescent wave interference and small aperture diffraction, which can be used in near-field high-density optical data storage, nano-lithography, near-field optical imaging and spectral detection, near-field optical manipulation of nano-scale specimen, etc. In this paper, the formation mechanism of the virtual probe is analysed, the evanescent wave interference discussed theoretically, and the sidelobe suppression by small aperture is simulated by the three-dimensional finite-difference time-domain method. The simulation results of the optical distribution of the near-field virtual probe reveal that the transmission efficiency of the virtual probe is 10(2)-10(4) times higher than that of the nano-aperture metal-coated fibre probe widely used in near-field optical systems. The full width at half maximum of the peak, in other words, the size of virtual probe, is constant whatever the distance in a certain range so that the critical nano-separation control in the near-field system can be relaxed. We give an example of the application of the virtual probe in ultrahigh-density optical data storage.

关键词： near-field optics evanescent wave interference virtual probe finite-difference time-domain method

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On the stability of the FDTD algorithm for elastic media at a material interface

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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 2002年第2期40卷 474-481页

作者： Schröder, CT Scott, WR Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

In this paper, the stability behavior of the first-order finite-difference time-domain algorithm for elastodynamics at the interface between two different materials is investigated. A necessary condition for stability is established, which, dependent on the material properties of the two media, might be more restrictive than the well-known Courant condition. It is shown that this more restrictive stability condition can be avoided if the material properties are averaged on the boundary.

关键词： elastic finite-difference time-domain method finite-difference stability

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Application of the concurrent complementary operators method to numerically derived absorbing boundary conditions

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2002年第4期32卷 272-275页

作者： Wu, X Ramahi, OM Univ Maryland A James Clark Sch Engn College Pk MD 20742 USA

The concurrent complementary operators method (C-COM) has been demonstrated to be it highly effective mesh truncation technique for the simulation of electromagnetic open-region transient or time-harmonic problems. In previous work, the C-COM was applied to analytically derived absorbing boundary conditions (ABCs). In this work, we show that the C-COM can be applied to the wider class of highly effective and versatile numerically derived ABCs. As a demonstration of the validity of this generalization, we consider the case of a Liao ABC, and show their high accuracy can be obtained. (C) 2002 John Wiley Sons, Inc.

关键词： absorbing boundary conditions complementary operators method finite-difference time-domain method

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