可见光波段SiO2/CdSe一维光子晶体及缺陷模的研究究

采用SiO2/CdSe构建了可见光波段一维光子晶体结构，并在其中引入LiTaO3缺陷层。利用传输矩阵法，分析了电磁波在无缺陷与含LiTaO3缺陷层两种光子晶体中的带隙结构，系统地研究了缺陷层参数对光子晶体可见光波段带隙结构的影响规律。计算结果表明：LiTaO3的引入，有利于带隙宽度的增加，调整缺陷层结构参数，缺陷模的位置可在不同颜色区域出现，如红光、黄光等缺陷模。该结构有望用于制作可见光波段的滤波器。

Doped Modes of SiO_2/CdSe One-dimensional Photonic Crystal with LiTaO_3 in Visible Region

In this paper SiO2 and CdSe were used to construct one-dimensional photonic crystal in visible region, including the introduction of LiTaO3 defect layer. The formation of photonic band gaps is exhibited and confirmed by a calculation of the transfer matrix method (TMM).There become defect modes in the photonic forbidden band gap compare with the photonic crystals without defects.The position,amount and reflection properties of the defect modes are related with not only the form of defect but also the thickness of defect and periodicity of photonic crystals. It is shown that the variety of the width of impure layer in one-dimensional photonic crystal and the periods number layers of photonic crystal could alter the transmission,the location and numbers of photonic defect mode.When the thickness of LiTaO3 inserts layer is regulated properly,for instance,the defect module could be appeared on red light,yellow light area of visible region.The structure should enable new applications for designing photonic crystal devices.