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3D low-dispersion ifd-fdtd based on 3D isotropic finite difference

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2005年第4期46卷 381-384页

作者： Xiao, F Tang, XH Mao, RJ Zhang, XJ UESTC Sch Elect Engn Chengdu Peoples R China

Usually, ID finite difference based on the Taylor series expansion theorem is used to approximate the spatial ideal partial-differential operator (IPDO) using conventional FDTD methods. Such a treatment is simple, but its severe numerical dispersion is untenable. In this paper, a kind of 3D isotropic finite difference (IFD) is introduced and a new FDTD method, called IFD-FDTD, is presented. A numerical-dispersion analysis shows that it is superior to Yee's conventional FDTD method. In addition, through the analysis of stability, it is found that its stability, condition is the same as that of Yee's FDTD method. (c) 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 381-384, 2005;Published online in Wiley InterScience (***). DOI 10.1002/mop.20993.

关键词： 3D isotropic finite difference finite-difference time-domain method numerical dispersion

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High-Q microcavities realized in a circular photonic crystal slab

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PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS 2005年第2-3期3卷 134-138页

作者： Xiao, SS Qiu, M Royal Inst Technol Dept Microelect & Informat Technol Lab Opt Photon & Quantum Elect S-16440 Stockholm Sweden

A series of microcavities in circular photonic crystal slabs are studied in this paper. It is shown that high quality factors can be obtained for such microcavities. For a cavity with three inner layers of air holes missing, Q factor larger than 105 can be obtained. It is also worth noting there exists resonant modes with high quality factors, even for the defect-free circular photonic crystal slab, due to gradual change of the average effective index. (c) 2005 Elsevier B.V. All rights reserved.

关键词： microcavity photonic crystal finite-difference time-domain method

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Band structures in nonlinear photonic crystal slabs

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OPTICAL AND QUANTUM ELECTRONICS 2005年第1-3期37卷 161-169页

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

The finite-difference time-domain method was used to analyze band structures in two-dimensional Kerr-nonlinear photonic crystal slabs. A triangular lattice of circular air rods was considered. Results show red-shifting of the band structure due to the nonlinearity and the incident intensity. The red-shift of the band gap between the first and the second bands is maximal when the air rod radius is in the range 0.2a to 0.25a, where a is the period.

关键词： finite-difference time-domain method Kerr-nonlinear material photonic crystal slab red-shift

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

Enhanced scattering of random-distribution nanoparticles and...

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14th International Symposium on Optical Memory

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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Split of phase-shifts in phase mask for proximity side-writing fiber Bragg gratings

Split of phase-shifts in phase mask for proximity side-writi...

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Conference on Holography, Diffractive Optics and Applications II

作者： Sheng, YL Rothenberg, JE Li, HP Wang, Y Univ Laval Dept Phys Phys Engn & Opt Quebec City PQ G1K 7P4 Canada

A phase shift in phase mask is split into two half-magnitude phase-shifts in near field. resulting in FBG spectral asymmetry. The errors are removed using new pre-compensating phase mask for binary-phase Dammann sampl... 详细信息

ISBN: (纸本)0819455911

关键词： Phase shifts Fiber Bragg gratings Photomasks Near field Binary data Optical design Phase shift keying Diffraction Error analysis finite-difference time-domain method

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Band structures in nonlinear photonic crystal slabs

Band structures in nonlinear photonic crystal slabs

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12th International Workshop on Optical Waveguide Theory and Numerical Modelling

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

关键词： finite-difference time-domain method Kerr-nonlinear material photonic crystal slab red-shift

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Simulation of the effect of a resist-surface bound air bubble on imaging in immersion lithography

Simulation of the effect of a resist-surface bound air bubbl...

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Conference on Optical Microlithography XVIII

作者： De Bisschop, P Erdmann, A Rathsfeld, A IMEC B-3001 Louvain Belgium

ISBN: (纸本)0819457345

Resist-surface bound air bubbles have been identified as a possible defect mechanism in immersion lithography. The general expectation is that the bubble will primarily cause local dose reductions, but no detailed simulations on this effect have been published. The work described in this paper is a first attempt to do so: we have simulated the effect of bubbles on 1:1 dense Line/Space patterning. Our results confirm that the major effect of the presence of a bubble is indeed underexposure - or in most cases even non-exposure - of the pattern in the area occupied by the bubble, but it also identifies a few more subtle characteristics of bubble-induced defects which can help identify defects observed on immersion wafers as being caused by a bubble. Apart from the simulation results, we also show a few experimentally observed immersion defects, which we believe are indeed generated by a bubble.

关键词： Optical spheres Semiconducting wafers finite-difference time-domain method Immersion lithography Refractive index finite element methods Lithography Optical lithography Printing Prototyping

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Multivariate analysis of photonic crystal microcavities with fabrication defects

Multivariate analysis of photonic crystal microcavities with...

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Conference on Photonic Materials, Devices and Applications

作者： Rico-García, JM López-Alonso, JM Alda, J Univ Complutense Madrid Dept Opt Sch Opt Madrid 28037 Spain

ISBN: (纸本)081945835X

Photonic crystal microcavities are defined by the spatial arrangement of materials. In the analysis of their spatial temporal mode distributions finite-difference time-domain (FDTD) methods have proved its validity. The output of the FDTD can be seen as the realizations of a multidimensional statistic variable. At the same time, fabrication tolerances induce an added and unavoidable variability in the performance of the microcavity. In this contribution we have analyzed the modes of a defective photonic crystal microcavity. The location, size, and shape of the cylinders configuring the microcavity are modelled as having a normal distribution of their parametric descriptors. A principal component analysis is applied to the output of the FDTD for a population of defective microcavities. The relative importance of the defects is evaluated, along with the changes induced in the spatial temporal distribution of electromagnetic field obtained from the calculation.

关键词： Photonic crystals Optical microcavities Principal component analysis finite-difference time-domain method Manufacturing Signal to noise ratio Error analysis Mahalanobis distance Statistical analysis Electromagnetism

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Optical modulator based on GaAs photonic crystals

Optical modulator based on GaAs photonic crystals

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Conference on Optoelectronic Materials and Devices for Optical Communications

作者： Li, JS Zhejiang Univ Ctr Opt & Electromagnet Res State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

ISBN: (纸本)0819460516

In this letter, we propose a novel optical modulator based on GaAs photonic crystals and investigate its optically properties numerically by using the finite-difference time-domain method. The position of the cutoff frequency can be varied by free carriers injection, and the band gap shift can be observed. Band gap shift is used to modulate light. Bing several micrometers length, low insertion loss, and large extinction ratios, the modulator can be used in ultra-small and ultra-dense photonic integrated circuits.

关键词： modulator photonic crystals optimum design optic-electron integrated bandwidth carrier injection finite-difference time-domain method GaAs design fabrication

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Use of waveguide bending as a new approach in the design of a triangular-lattice photonic crystal bandpass filter

Use of waveguide bending as a new approach in the design of ...

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Conference on Optoelectronic Integrated Circuits VII

作者： Moon, KM Park, IS Lee, HS Lee, SG O, BH Park, SG Lee, EH Inha Univ Sch Informat & Commun Engn OPERA Inchon 402751 South Korea

ISBN: (纸本)0819457035

We present a new approach in the design of a photonic crystal bandpass filter by using waveguide bending. The bandpass filter was designed by introducing two bends with the modified geometry into the both ends of a photonic crystal waveguide. We show that such a filter exhibits step-like spectral profile in the range of 15001600 nm, with a maximum transmission of 100%. In contrast to the other designs proposed, the present one does not involve either insertion of small defects or control of cavity-lengths.

关键词： Waveguides Photonic crystals Bandpass filters Dispersion finite-difference time-domain method Photonic integrated circuits Magnetism Waveguide modes Optical filters Wave propagation

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