摘要
为了研究光子晶体中的负折射行为,我们应用2维TM模时域有限差分方法,数值模拟了高斯波束从自由空间垂直入射和斜入射到二维三角晶格光子晶体平板后的折射现象,并给出了平板内外的电场强度分布。模拟结果显示:垂直入射时,光子晶体平板对高斯波束具有汇聚作用,汇聚特性随着波源到晶体的距离的改变而发生显著的变化;斜入射时,折射波束与入射波束也均在法线的同一侧。结果证明了高斯波束在光子晶体和空气的交界面发生了负折射。模拟结果有望在制作聚焦透镜、带通滤波器、耦合器等光子晶体器件方面得到重要应用。
To study the behavior of negative refraction in photonic crystals, the refraction for Gaussian beam through 2-D triangular lattice photonic crystal slab is simulated by using finite difference time domain method for TM mode, and the electric field intensity distribution inner and outer the photonic crystal slab is presented. The results show that photonic crystal slab can condense the normal incident Gaussian beam, the characteristics of condersation may change when the distance between Gaussian beam source and photonic crystal slab is varied ; as to oblique incidence of Gaussian beam, the refracted beam and the incident beam are on the same side of the incidence. The results prove that the Gaussian beam undergoes a negative refraction in the interface of photonic crystal slab and air. This work will be significance in fabricating photonic crystal devices such as focusing lens, band-pass filters, coupler.
出处
《量子光学学报》
CSCD
北大核心
2008年第4期432-437,共6页
Journal of Quantum Optics
基金
曲阜师范大学博士科研启动基金
关键词
光子晶体
高斯波束
TM模
负折射
时域有限差分方法
photonic crystal
Gaussian beam
TM mode
negative fraction
finite difference time domain method
