利用一维电介质-磁光子晶体设计宽带全方向全反镜  

A Broad Omnidirectional Total Reflector Designed by One-dimensional Dielectric-magnetic Photonic Crystals

作　　者：强海霞 蒋立勇[1] 李相银[1] 

机构地区：[1]南京理工大学应用物理系,南京210094

出　　处：《光子学报》2010年第2期255-259,共5页Acta Photonica Sinica

摘　　要：研究了基于一维电介质-磁光子晶体的全方向全反射镜(简称全反镜).利用传输矩阵法分析了全反镜的传输特性.为了获得宽频带全反镜,利用十进制遗传算法优化全反镜的结构参量,即层厚度系数与周期数.设计过程逐步详细阐述.计算结果表明,随着参加优化的变量(厚度系数和周期数)数增多,全反带更宽,薄膜层数更少、结构总厚度更薄.最后得到了一个宽带全反镜(0.255A0.255B)5(0.169A0.066B)8,其带宽可达1.34ω0,而薄膜层数大幅降为26层,总厚度仅为1.8634λ0,结构也非常简单.The omnidirectional total reflectors based on one-dimensional dielectric and magnetic photonic crystals were investigated in this paper. The transmission matrix method was adopted to analyze the transmission properties of such reflectors. In order to obtain broad omnidirectional total reflection bandwidth,the decimal Genetic algorithm was used to optimize their structural parameters including the thickness ratios of the layers and the numbers of periods. The calculation results show that, with the more parameters（including the number of periods and the thickness ratios of the layers） participating in the optimization,the omnidirectional total reflection band becomes wider, the number of the layers becomes less, and the total thickness of the whole structure becomes thinner. Finally, an optimal design described as （0. 255A0. 255B）5 （0. 169A0. 066B）8 is obtained. The omnidirectional total reflection bandwidth can reach to 1. 34ω0, the number of the layers is just 26, and the whole thickness is just 1. 8634λ0. The whole structure is very simple.

关 键 词：一维光子晶体 全方向全反镜 传输矩阵法 遗传算法 磁光子晶体 

分 类 号：O411.3[理学—理论物理]