三组元光子晶体的宽带隙及缺陷模研究  

The Study of Large Complete Band Gap and Defect Modes in Three-component Photonic Crystal

作　　者：李晓春[1] 肖清武[1] 梁宏宇[1] 赵保星[1] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083

出　　处：《材料导报》2007年第8期129-132,共4页Materials Reports

基　　金：湖南省自然科学基金支持项目(No04JJ3079)

摘　　要：运用时域有限差分(FDTD)方法计算了GaAs/玻璃/空气三组元光子晶体的透射频谱及缺陷模的传输特征,发现GaAs/玻璃/空气三组元体系的最低完全带隙宽度明显宽于玻璃/空气或GaAs/空气二组元体系,适当调整GaAs/玻璃比例可以得到宽带隙;光子晶体中的缺陷会形成局域模式,线型缺陷形成光波波导;设计适当的组合缺陷,并通过缺陷之间的耦合作用可以实现对光波传播的选择性输出。Using the finite difference time domain （FDTD） method, the transmission spectrum and the propagating characteristics of defect modes in two-dimensional three-component GaAs/glass/air photonic crystal are investigated. It＇s found that the first lowest band gap in the three-component system is obviously wider than the band gap either in glass/air or GaAs/air two-component system. Designing a suitable size ratio between GaAs and glass, a wider band gap can be obtained. Defects in the photonic crystal will result in localized modes of light wave, especially, a waveguide can be formed with a line defect. Owing to the coupling effects between defects, light propagating of wanted frequency can be allowed by designing suitable combined defects.

关 键 词：光子晶体 三组元 时域有限差分法 缺陷 波导 

分 类 号：O734[理学—晶体学] O779