摘要
本文设计了一种可动态调节的宽频太赫兹完美吸收器,该吸收器由十字形的二氧化钒层、金属接地平面和夹在中间的二氧化硅层组成。仿真结果表明,90%以上的吸收带宽为1.06 THz,范围为0.71~1.77 THz。吸收率随二氧化钒电导率的变化而变化,可在4%~99.5%之间动态调节。为了得到吸收器工作的物理机理,引入了阻抗匹配理论和波干涉理论,并通过电场分布分析了两个完美吸收峰的物理来源。该吸收器具有广角吸收和偏振不敏感的特点。该吸收器可以用于太赫兹传感器、探测器和隐身装备等。
A broadband terahertz(THz)perfect absorber that can be dynamically adjustable is designed.The absorber consists of a cross-shaped vanadium dioxide layer,metal ground plane,and sandwiched silicon dioxide layer.Simulation results indicate that a bandwidth of 1.06 THz(ranging from 0.71 to 1.77 THz)provides greater than 90%absorption.The absorptivity varies with VO_(2)conductivity and can be dynamically adjusted from 4%to 99.5%.To obtain the physical mechanism of the absorber operation,impedance matching theory and waveinterference theory are introduced,and the physical source of the two perfect absorption peaks is analysed by electric field distribution.The absorber has the characteristics of wide-angle absorption and polarisation insensitivity and can be used in THz sensors,detectors,and stealth equipment.
作者
张婷
杨森
于新颖
Zhang Ting;Yang Sen;Yu XinYing(Shanxi Vocational University of Engineering Science and Technology,Jinzhong,Shanxi 030619,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第21期250-256,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61501213)。
关键词
材料
超材料
太赫兹吸收器
可调带宽
宽带
materials
metamaterial
terahertz absorber
tunable bandwidth
broadband
作者简介
通信作者:张婷,zhangting_cai@163.com。
