基于超材料的多频带可调谐太赫兹吸收器  

Multi-band tunable terahertz absorber based on metamaterial

作　　者：佟艳群[1,2] 汪诗妍 宋效先 杨磊 姚建铨 叶云霞[1,2] 任云鹏[1,2] 张雅婷[1,2,3] 辛姗姗 任旭东[1,2] TONG Yan-Qun;WANG Shi-Yan;SONG Xiao-Xian;YANG Lei;YAO Jian-Quan;YE Yun-Xia;REN Yun-Peng;ZHANG Ya-Ting;XIN Shan-Shan;REN Xu-Dong(Institute of Micro-nano Optoelectronics and Terahertz Technology,Jiangsu University,Zhenjiang 212013,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China;School of Precision Instrument and Optoelectronic Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]江苏大学微纳光电子与太赫兹技术研究院,江苏镇江212013 [2]江苏大学机械工程学院,江苏镇江212013 [3]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《红外与毫米波学报》2020年第6期735-741,共7页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(51405200,51775253);江苏省六大人才高峰创新团队项目(TD-KTHY-005);中国博士后科学基金(2015M580395,2019M651725);江苏省自然科学基金(BK20180862,BK20170559,BK20190839)。

摘　　要：设计了一种多频带可调谐的太赫兹超材料吸收器。在超材料吸收器的结构中,引入光敏半导体硅材料,设计特殊的顶层金属谐振器,分析开口长度、线宽、介质层厚度等参数尺寸对太赫兹超材料吸收器的吸收光谱特性影响。根据光照与光敏半导体硅电导率之间的关系,研究太赫兹超材料吸收器的频率调谐特性。仿真结果得到太赫兹波段的12个吸收频率调制,其中有10处吸收峰的吸收率超过90%近完美吸收,且有6处吸收率达到99%的完美吸收,而且吸收率调制深度和相对带宽分别达到85.9%和85.5%,具有很强的可调谐特性。设计的光激励太赫兹超材料吸收器结构简单,具有多频带可调谐和完美吸收特性,扩大了吸收器的应用范围。A multi-band tunable terahertz metamaterial absorber is proposed.In the structure of the metamaterial absorber,a photosensitive semiconductor silicon material was added and a special top metal resonator was designed.Analyzed the influence of the parameters such as the opening length,line width and dielectric layer thickness on the absorption spectral characteristics of the terahertz metamaterial absorber.According to the relationship between illumination and the conductivity of photosensitive semiconductor silicon,the frequency tuning characteristics of the terahertz metamaterial absorber was studied.The simulation results obtain 12 absorption frequency modulations in the terahertz band,the absorption rate of 10 absorption peaks of them exceeds 90%near perfect absorption,and 6 absorptions rate up to 99%perfect absorption.Moreover,the absorptivity modulation depth and relative bandwidth reaches 85.9%and 85.5%respectively,with strong tunable characteristics.The photo excited terahertz metamaterial absorber has a simple structure,multi-band tunable and perfect absorption characteristics,and expands the application range of the absorber.

关 键 词：太赫兹吸收器 超材料 光激励 多频带可调谐 

分 类 号：O436[机械工程—光学工程]