Unidirectional Transmission in Asymmetrically Confined Photonic Crystal Defects with Kerr Nonlinearity  

作　　者：林旭升 兰胜 

机构地区：[1]Department of Physics, Shantou University, Shantou 515063 [2]School for Information and Optoelectronic Science and Engineering, South China Normal University,Guangzhou 510631

出　　处：《Chinese Physics Letters》2005年第11期2847-2850,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10374065, the Natural Science Foundation of Guangdong Province under Grant No 32050, the Ministry of Education of China under Grant No 204107, and the Department of Education of Guangdong Province under Grant No Z03033.

摘　　要：We investigate the unidirectional transmission behaviour of an asymmetrically confined photonic crystal （PC） defect with Kerr nonlinearity. Basically, the unidirectional transmission originates from the strong dependence of the threshold input power for the sharp increase of transmission on the launch direction of the input wave. This can be well explained in the framework of the coupled mode theory. Our theoretical analysis reveals the existence of an upper limit for the transmission contrast when such a single PC defect is employed. This is supported by the simulation results based on the nonlinear finite-difference time-domain technique.We investigate the unidirectional transmission behaviour of an asymmetrically confined photonic crystal （PC） defect with Kerr nonlinearity. Basically, the unidirectional transmission originates from the strong dependence of the threshold input power for the sharp increase of transmission on the launch direction of the input wave. This can be well explained in the framework of the coupled mode theory. Our theoretical analysis reveals the existence of an upper limit for the transmission contrast when such a single PC defect is employed. This is supported by the simulation results based on the nonlinear finite-difference time-domain technique.

关 键 词：OPTICAL DIODE WAVE-GUIDES LOCALIZATION SLAB 

分 类 号：O734[理学—晶体学]