基于低折射率材料完全带隙光子晶体结构设计  

Design of two-dimensional photonic crystal with complete photonic band gaps based on low refractive index material

作　　者：刘会 闫香 陈敏 王军延 LIU Hui;YAN Xiang;CHEN Ming;WANG Jun-yan(College of Physics and Electronic Information Engineering,Hubei Engineering University,Xiaogan 432000,China)

机构地区：[1]湖北工程学院物理与电子信息工程学院

出　　处：《云南大学学报（自然科学版）》2020年第1期127-134,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：湖北省教育厅中青年人才项目(Q20172702);国家自然科学基金(11847118)

摘　　要：通过降低正方晶格晶格结构对称性,采用晶格结构以及散射子结构简单的矩形晶格介质圆柱二维光子晶体,实现低折射率条件下完全带隙的获得.基于平面波展开法研究光子晶体完全带隙特性,研究表明:对于介质柱型二维光子晶体,无论矩形晶格还是正方晶格,都偏向于TM带隙的形成,但是晶格结构对称性的降低使得矩形晶格更益于TE带隙的形成,TE带隙宽度和数目的增加,使得矩形晶格介质柱型二维光子晶体可以实现低折射率条件下完全带隙的获得:当介质折射率大于2.0时,即可通过调节光子晶体结构参数获得完全带隙.By reducing the lattice symmetry of the square lattice,two-dimensional photonic crystal with a rectangular lattice of circular dielectric rods was employed to obtaining the complete photonic band gap(CPBG)under the condition of low refractive index.Plane wave expansion method was employed to study the CPBG of two-dimensional photonic crystal.The result reveals that both square lattice and rectangular lattice favor TM PBGs,but the reduction of lattice symmetry can produce an increase in the number of PBG and a broadening of PBG width for TE modes,which is conductive to obtaining CPBG under the condition of low refractive index for the rectangular lattice:the CPBG is observed when the refractive index of the dielectric materials is larger than 2.0.

关 键 词：光子晶体 完全带隙 平面波展开法 

分 类 号：O734[理学—晶体学]