光子晶体缺陷对的非对称透射行为研究

A Research on Asymmetric Transmission Behavior of Photonic Crystal Defects

基于FDTD技术的数值模拟方法研究光子晶体缺陷对的非对称透射行为,目的是实现高透射率以及最大对比度的全光二极管。研究发现相较由单个非对称缺陷构成的光二极管而言,这种由两个尺寸不同但具有相同谐振频率的缺陷对构成的光二极管其透射对比度要大很多,选择谐振频率相同的缺陷对构成光二极管可以确保一个高的线性透射率,不同尺寸的缺陷虽具有相同谐振频率,但对外部激发所至的非线性响应存在巨大的差异。

Based on numerical simulations of the finite-difference time-domain （FDTD） technique, the asymmetric transmission behavior of nonlinear photonic crystal （PC） defects is investigated in the hope of obtaining high optical transmission and optical diodes with largest contrast. It is found that transmission contrast of optical diodes consisting of defect pairs with different size but the same resonant frequency is much larger than those optical diodes consisting of a single asymmetric defect. In addition, the maximum linear transmission can be significantly improved by choosing defects with the same resonant frequency. Finally, it is revealed that the responses to the external excitation are very different for the two PC defects with different sizes.