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FDTD Research of Optical Switch of Two-Dimensional Photonic Crystal Waveguide Coupler

Author: ZhaoZuo
Tutor: DingYingChun
School: Beijing University of Chemical Technology
Course: Condensed Matter Physics
Keywords: Photonic crystal Finite-difference time-domain (FDTD) method Coupled waveguide Optical switch
CLC: TN252
Type: Master's thesis
Year: 2009
Downloads: 190
Quote: 2
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Abstract


Photonic localization properties artificially control the flow of light can be realized , so that the photonic crystal optical switching device having a conventional optical switching device does not have the advantage of . Photonic crystal optical switches compared to traditional optical switching devices in the structure of the switch , speed , reliability , power consumption , scalability, and other aspects have a great advantage, which makes it ideal for future integrated optical path components . In this paper, two-dimensional photonic crystal waveguide coupler type all-optical opening research , the main contents include: 1 , using the finite difference time domain method ( FDTD ) , to discuss the common two -dimensional photonic crystal structure , as well as different crystalline lattice constant , dielectric cylinder radius of the forbidden band position , bandwidth and transmission results . 2, the two-dimensional photonic crystal line defect waveguide multifaceted research , including : two-dimensional photonic crystal of square lattice , for example , their line defect waveguide transmission characteristics of the structure to simulate different frequency of the incident light transmission characteristics . While the 90 ° bending of the optical transmission of the waveguide characteristic simulation prove that the low - loss optical transmission . A two - dimensional photonic crystal waveguide coupled structure , principle , and the function of the realization of the coupling . Select the appropriate device length coupled wave energy passed back and forth between the waveguide . While the design of a specific structure of the coupler, the directional coupler function of the different frequencies of light can be achieved . Structure and the parameters can be adjusted depending on the needs of the photonic crystal coupler design. 3 , a two-dimensional photonic crystal waveguide coupler type all-optical switch , and use the FDTD its energy band and the transmission characteristics were studied . The numerical calculations show that the coupling coefficient and length, suitable optical transmission can be achieved switching action would reduce the bandwidth to reduce the coupling length . Also established a non-linear model of FDTD nonlinear absorption effect of such structured light switch , found nonlinear two-photon absorption effect be the effect of the optical switch certain impact , this is the future of this class optical switching devices designed to provide a theoretical basis .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Waveguide
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