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 depen...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.展开更多
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.
文摘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.
