Abstract
We investigate the unidirectional transmission behaviour of anasymmetrically confined photonic crystal (PC) defect with Kerrnonlinearity. Basically, the unidirectional transmission originatesfrom the strong dependence of the threshold input power for the sharpincrease 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 forthe transmission contrast when such a single PC defect is employed.This is supported by the simulation results based on the nonlinearfinite-difference time-domain technique.
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