格点形状和取向对二维光子晶体禁带的影响  

Effects of Shapes and Orientations of Rods on the Photonic Band Gap in Two Dimensional Photonic Crystals

作　　者：陆晓东[1] 韩培德[1] 全宇军[1] 叶志成[1] 窦金锋[1] 吴黎[1] 赵春华[1] 

机构地区：[1]中国科学院半导体研究所光电子研发中心,北京100083

出　　处：《光电子．激光》2005年第11期1336-1341,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60477020);国家"863"计划资助项目(2001AA312130)

摘　　要：以椭圆形和正方形介质柱组成的二维正方晶格为例,讨论了格点形状和取向变化时对光子晶体能带的影响,对比分析了波矢在周期性平面和不在周期性平面2种情况下的能带图。计算表明:格点形状和取向的适当变化可以使没有完全带隙的光子晶体出现完全带隙,低阶的完全带隙转变成高阶完全带隙。此外,经对比发现:波矢偏离周期性平面对椭圆形介质柱的正方晶格形成的完全带隙的影响,要比正方形介质柱正方晶格的完全带隙的影响要大得多。We take the square lattices with elliptic and square rods respectively as exampies,to illuminate the effect of shapes and orientations of rods on the photonic band gap in two-dimensional square lattices. Two cases have been discussed that the wave vectors are in the periodic plane and off the periodic plane. By compare,we find that the changes of the shapes and orientations of rods will make the photonic-crystals which have no complete band gap present a complete band gap or turn low complete band gap in low frequency range to a higher frequency range. We also find that wave vector in and off periodic plane will influence the lattices composed of elliptic rods much larger than that composed of square rods.

关 键 词：光子晶体 完全禁带 平面波法 

分 类 号：O731[理学—晶体学]