基于金属-介质-金属银纳米环阵列结构的光吸收特性  

The Optical Absorption Properties of the Structure based on Metal-dielectric-metal Silver Nanoring Arrays

作　　者：王兆华[1] 高万芳[1] 张秋艳 WANG Zhaohua;GAO Wanfang;ZHANG Qiuyan(College of Energy Engineering,Yulin University,Yulin 719000,China)

机构地区：[1]榆林学院能源工程学院,榆林719000

出　　处：《光散射学报》2022年第4期273-277,共5页The Journal of Light Scattering

基　　金：陕西省教育厅专项项目(20JK1006);榆林市科学技术局项目(CXY-2020-006-04)。

摘　　要：本文设计了一种中红外等离激元共振吸收体,该吸收体采用三层结构,底层为银金属方形层,中间为二氧化硅方形介电层,顶层为银纳米环阵列。当入射光垂直于吸收体表面入射时,采用三维有限元法数值模拟了不同尺寸单元阵列的反射、透射和吸收光谱。结果表明:在波长2900 nm处获得了一个完美的吸收峰,半高宽达390 nm,吸收率达97%,并且通过改变纳米环阵列的尺寸,共振波长的可调范围达400 nm。In this paper,we design a plasmonic absorber with a three-layer structure in the mid-infrared region.The bottom metal layer is a silver metal square layer,the middle layer is a silicon dioxide dielectric layer,and the top metal layer is silver nanoring arrays.When the incident light is perpendicular to the absorber surface,the reflection,transmission and absorption spectra of different size element arrays are numerically simulated with the three-dimensional finite element method.It is shown that a perfect absorption peak is achieved at a wavelength of 2900 nm,with a half-height width of 390 nm and an absorptivity of 97%.The tunable range of resonance wavelength is 400 nm by varying the dimensions of this structure.

关 键 词：中红外 银纳米环阵列 完美吸收 

分 类 号：O433.5[机械工程—光学工程]