Two models of 2D photonic crystal of line defects and nonperiodic dielectric rods are established.The finite-difference-time-domain method is developed for the study of bandgap.

• 构建了介质柱间距变化的变周期结构以及介质柱半径线缺陷两种二维光子晶体模型,并将时域有限差分法用于其能带特性研究。