基于椭圆基元光子晶体的宽角度自准直传输研究

摘要

In view of the self-collimation transmission phenomenon , a finite-difference time-domain scheme in a nonorthogonal coordinate system is presented to calculate the band structure of a two-dimensional photonic crystal.Self-collimation of photonic crystals in the whole angular range of ±90°in the fourth band of a two-di-mensional photonic crystals with elliptical basis is demonstrated by examining the band structure and equifre -quency contours .non-diffraction guiding modes is verified by a gaussian beam .%针对二维光子晶体在自准直传输现象，推导了非正交坐标系下的时域有限差分（ FDTD）模型，有效地计算了二维椭圆基元光子晶体带隙结构。结合等频图分析，从理论上研究了二维椭圆基元光子晶体结构中TM模式的自准直现象，优化设计出宽角度自准直效应模型，并通过高斯波束验证了其无衍射自导传输模式。