不同晶格光子晶体异质结的界面传导模  

Guide modes at interface of photonic crystal heterostructures composed of different lattices

作　　者：刘江涛[1] 周云松[1] 王福合[1] 顾本源 

机构地区：[1]首都师范大学物理系,北京100037 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》2004年第6期1845-1849,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划 (批准号 :0 0 1CB610 40 );北京市自然科学基金 (批准号 :10 3 2 0 0 3 )资助的课题~~

摘　　要：利用平面波展开方法与超原胞方法研究了两种不同晶格的光子晶体异质结的界面态 .这两种异质结都是在纯电介质背景上放置空气散射子 .一种异质结由正方形格子上放置正方形散射子和三角形格子上放置六角形散射子组成 (SSTH异质结 ) .另一种由长方格子上放置长方形散射子和三角形格子上放置圆形散射子组成 (RRTC异质结 ) .对于SSTH异质结 ,当沿着界面作晶格的横向拉开或者侧向滑移 ,都可产生界面态 .而对于RRTC异质结 ,无需从界面做晶格拉开或者侧向滑移就可产生界面传导模 。We have investigated the guide modes in two kinds of two_dimensional photonic crystal heterostructures by using the plane wave expansion method combined with the supercell technique. These heterostructures consist of different air cylinders embedded into host dielectric in different lattices. Namely, One heterostucture is composed of square cylinders in square lattice and hexagon cylinders in triangular lattice (SSTH heterostucture). The other heterostucture is composed of rectangular cylinders in rectangular lattice and circle cylinders in triangular lattice(RRTC heterostucture). We find that the SSTH heterostucture may produce guide modes in absolute photonic band gap (PBG) when introducing relative longitudinal gliding or transverse displacement of the sub_lattices along the interface of the heterostructure. But the RRTC heterostucture can produce guide modes in absolute PBG without any relative longitudinal gliding or transverse displacement. This feature is quite different from other pure dielectric photonic crystals heterostructures.

关 键 词：光子晶体 异质结 传导模 超原胞 晶体结构 

分 类 号：O734[理学—晶体学]