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非线性Bragg微腔的双稳态研究
引用本文:陈宪锋,沈小明,蒋美萍,是度芳.非线性Bragg微腔的双稳态研究[J].光子学报,2007,36(4):613-616.
作者姓名:陈宪锋  沈小明  蒋美萍  是度芳
作者单位:1. 江苏工业学院,信息科学系,江苏,常州,213016
2. 江苏工业学院,信息科学系,江苏,常州,213016;华中科技大学,物理系,武汉,430074
摘    要:研究了一维Bragg微腔中的光学增强效应,并对F-P腔中Kerr介质的双稳态特性进行了理论分析,并得到相应的数学表达式.研究表明,对聚焦型Kerr介质(χ(3)>0),要产生双稳态特性必须给入射光波预置一定的红移量,若是散焦型介质(χ(3)<0)则要预置一定的蓝移量.红移量(或蓝移量)的临界值与光子晶体的介质折射率、周期数、F-P腔长度、缺陷模的线宽(FWHM)等因素密切相关,它随介质折射率比、周期数、F-P腔长的增大而减小,随缺陷模的线形变窄而降低.要有效地降低非线性介质的双稳态开关阈值,除了尽可能选择较小的合适红移(或蓝移)量外,还要选择|χ(3)|较大的Kerr介质以增强腔内的非线性光学效应.

关 键 词:非线性  Kerr介质  双稳态  传输矩阵
文章编号:1004-4213(2007)04-0613-4
收稿时间:2005-12-14
修稿时间:2005-12-14

Study on the Bistability of Nonlinear Bragg Microcavity
CHEN Xian-feng,SHEN Xiao-ming,JIANG Mei-ping,SHI Du-fang.Study on the Bistability of Nonlinear Bragg Microcavity[J].Acta Photonica Sinica,2007,36(4):613-616.
Authors:CHEN Xian-feng  SHEN Xiao-ming  JIANG Mei-ping  SHI Du-fang
Institution:1.Department of Information Science,Jiangsu Polytechnic University,Changzhou,Jiangsu 213016,China;2.Department of Physics,Huazhong University of Science and Technology,Wuhan 430074,China
Abstract:The optical enhancement effect of 1D Bragg microcavity was studied,the bistability of Kerr medium in a F-P cavity was theoretically analyzed,and the corresponding mathematical formula was presented.The investigation shows that appropriate magnitude of red-shifting should be put on the incident light in order to produce bistable properties for focusing nonlinear medium (χ(3)>0),and blue-shifting for defocusing nonlinear medium (χ(3)<0).Red-shifting (or blue-shifting) threshold relies closely on the dielectric refractive index and number of periods of photonic crystal,thickness of F-P cavity and line width of defect mode (FWHM).The threshold decreases with the refractive index,number of periods and thickness of F-P cavity increasing,and it also decreases with FWHM narrowing.In order to effectively lower the bistable threshold of nonlinear medium the red-shifting (or blue-shifting) should be as small as possible,and Kerr medium with larger |χ(3)| has to be selected to enhance the nonlinear optical effects in cavity.
Keywords:Nonlinear  Kerr medium  Bistability  Transfer matrix
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