基于金属/介质混合腔阵列结构的偏振完美吸收及传感应用研究  

The Metal and Dielectric Hybrid Cavity Arrays for Polarization-Manipulated Multispectral Perfect Absorption and Sensitive Sensing

作　　者：李聪 喻思丹 刘天长 桑明煌[1] LI Cong;YU Sidan;LIU Tianchang;SANG Minghuang(College of Physics and Communication Electronics,Jiangxi Key Laboratory of Optoelectronic and Telecommunication, Jiangxi Normal University,Nanchang Jiangxi 330022,China)

机构地区：[1]江西师范大学物理与通信电子学院,江西省光电子通信重点实验室,江西南昌330022

出　　处：《江西师范大学学报（自然科学版）》2018年第4期389-392,共4页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：国家自然科学基金(61505073,61765008,11764020),江西省自然科学基金(20161ACB21011,20161BAB212045)和江西省教育厅科技课题(GJJ150313,GJJ160273)项目资助.

摘　　要：提出一种完美吸收结构,其包含一金衬底层,上方为金圆柱与氧化铝长方柱镶嵌而成的金属/介质混合腔阵列.模拟计算发现:电场主要局域在金圆柱的边缘和氧化铝长方柱内部,该结果表明偶极等离子体共振和等离子体激元腔模式是产生多频带完美吸收的主要机理.该结构制作简单,且其完美吸收具备偏振调控和对周围样品折射率变化高度灵敏,这些特性有望为实现痕量检测提供一种简便方法.A multispectral perfect absorber is proposed and demonstrated by utilizing a square array of an Al 2O 3-cuboid intercalated with an Au-cylinderdeposited on an opaque Au substrate.It is shown that the electric field is strongly localized in the corner region of Au cylinder and the inside area of Al 2O 3 cuboid,namely,the dipolar plasmon resonance and the plasmon cavity mode are the two primary reasons for the occurrence of perfect absorption.Moreover,the absorption is polarization depended and highly sensitive to the refractive index variation of the surrounding sample.These findings could open a simplified alternative approach to achieve the practical trace detection.

关 键 词：光学腔模 偶极等离子体共振 灵敏度 偏振可调多带吸收 

分 类 号：TN253[电子电信—物理电子学]