基于异质结构的一维光子晶体红外3～5μm高反射镜设计

High Reflector Designed with One-Dimensional Photonic Crystal in 3-5μm Infrared Region Based on Hetero-Structure

研究了具有异质结构且适用于3~5μm红外光区的一维光子晶体高反射镜,系统地分析了光波在一维周期性光子晶体中的反射特性,通过传输矩阵计算和仿真验证了λ/4介质膜系的反射率和最佳禁带宽度。在此基础上,选取Si和Y_2O_3两种材料,构造了24层一维光子晶体的双异质结构,仿真结果表明:在3~5μm红外波段,该结构的反射率为97.418%~99.999%。为了减少膜层数量,以金属银为衬底,设计了以Si和Y_2O_3为介质层结构的一维金属增强型光子晶体,其总层数为9层,仿真结果表明:在3~5μm红外波段,其反射率为98.943%~99.979%。

In this paper,a high reflector based on one-dimensional photonic crystal of hetero-structure in infrared region（3-5μm）is investigated.The reflection characteristics of light wave in one-dimensional periodic photonic crystals are systematically analyzed.The reflectivity and the optimal forbidden band width of the λ/4 dielectric film system are verified by transfer matrix theory calculation and simulation.On this basis,Si and Y2O3 are selected to construct the one-dimensional photonic crystal of double hetero-structure with 24 layers.The simulation result shows that the reflectivity in infrared region（3-5μm）is between 97.418% and 99.999%.In order to reduce the number of the film layers,using metal silver as an substrate,we design the dielectric layer structure of Si and Y2O3 with 9 layers of one-dimensional metal enhanced photonic crystal.The simulation result shows that the reflectivity is between 98.943% and 99.979% in the infrared band of 3-5μm.