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Band structures in nonlinear photonic crystal slabs

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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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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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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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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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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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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An ADI-FDTD algorithm in curvilinear coordinates

An ADI-FDTD algorithm in curvilinear coordinates

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Asia-Pacific Microwave Conference

作者： Song, W. Hao, Y. Parini, C. G. Queen Mary Univ London Dept Elect Engn London E1 4NS England

ISBN: (纸本)078039433X

The alternating direction implicit scheme (ADI) has been successfully applied to finite-difference time-domain (FDTD) method to achieve an unconditionally stable algorithm. In this paper the ADI-FDTD method is extended to a conformal FDTD scheme in curvilinear coordinates. The effectiveness and accuracy of the proposed ADI-NFDTD is demonstrated.

关键词： computational electromagnetics electromagnetic waves finite difference time-domain analysis iterative methods ADI-FDTD algorithm alternating direction implicit scheme curvilinear coordinates finite-difference time-domain method finite difference time domain method Spherical coordinates Computational electromagnetics electromagnetic waves iterative methods

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FDTD analysis of nano-antenna structures with dispersive materials at optical frequencies

FDTD analysis of nano-antenna structures with dispersive mat...

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Conference on Nanotechnology II

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

ISBN: (纸本)0819458333

The finite-difference time domain method has encountered several difficulties when analyzing dispersive materials. This is the case of the metal structures that configure an optical antenna. These devices couple the electromagnetic radiation to conform currents that are rectified by another physical element attached to the antenna. Both elements: antenna and rectifier configures an optical detector with sub-wavelength dimensions. In this contribution we analyze the effect on the currents induced by the incident electromagnetic field using FDTD and taking into account the dispersive character of metal at optical frequencies. The analysis is done in a 2 dimensional framework and it serves as an analytical tool for the election of material and structures in the fabrication of optical antennas.

关键词： Metals Antennas finite-difference time-domain method Visible radiation Dielectrics Dielectric polarization Maxwell's equations Optical antennas Refraction Electromagnetic radiation

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Two-dimensional photonic crystal polarization splitter

Two-dimensional photonic crystal polarization splitter

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Conference on Nanophotonics, Nanostructure and Nanometrology

作者： Li, MY Gu, PF Jie, X Li, YY Zhejiang Univ State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

ISBN: (纸本)0819455903

A method is introduced to fabricate two-dimensional photonic crystal polarization splitter, which is based on the deposition of multiplayer films onto a grating. The plane-wave expansion method and the finite-difference time-domain method are used to calculate the band structure of this two-dimensional photonic crystal formed by a rectangular lattice of rectangular columns. After optimizing the thickness of each layer film, we find a large bandgap of TE. The theoretical relative bandwidth is 33.2%.

关键词： photonic crystal polarization splitter bandgap finite-difference time-domain method

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