基于三谐振吸收峰的超材料太赫兹传感器  

Metamaterial terahertz sensor based on three resonant absorption peaks

作　　者：张晓 胡放荣[1] 张隆辉[1] 江明珠 ZHANG Xiao;HU Fangrong;ZHANG Longhui;JIANG Mingzhu(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2023年第2期157-164,共8页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(62065005);广西自然科学基金(2020GXNSFDA238019);广西自动检测技术与仪器重点实验室基金(YQ21101)。

摘　　要：设计了一种基于三谐振吸收峰的超材料太赫兹传感器,其单元结构由金属超表面、聚酰亚胺(PI)介质层和金属底板构成。金属超表面包含内外2个对称的多开口环和2根位于内环中央的金属短棒。用时域有限积分法对传感器的性能进行了仿真,结果表明,传感器在f_(1)=0.4982 THz,f_(2)=0.7138 THz和f_(3)=0.9602 THz处具有3个窄带谐振吸收峰,吸收率分别为93.92%、99.95%和99.91%。当传感器表面覆盖分析物时,3个谐振吸收峰的灵敏度分别为71.5、121、190.3 GHz/RIU,且各谐振峰的频移量、频移量均值都与分析物的折射率呈线性关系。A metamaterial terahertz sensor based on tri-resonant absorption peak was designed,and the unit structure was composed of a metal super surface,a polyimide(PI)medium layer and metal base plate.The metal super surface contains two symmetrical multi-open rings and two metal short rods in the center of the inner ring.The performance of the sensor was simulated using the time domain finite integral method,and the results show that the sensor has three narrowband resonant absorption peaks at f_(1)=0.4982 THz,f_(2)=0.7138 THz and f_(3)=0.9602 THz,and the absorption rates are 93.92%、99.95%and 99.91%,respectively.When the surface of the sensor is covered with analyte,the sensitivities of the three resonance absorption peaks are 71.5,121 and 190.3 GHz/RIU respectively,and the frequency shift and the average value of the frequency shift of each resonant peak are linear with the refractive index of the analyte.The sensor has potential application value in terms of high precision detection of trace biomolecules and early diagnosis of diseases.

关 键 词：三谐振吸收峰 太赫兹超材料 传感器 灵敏度 

分 类 号：O436[机械工程—光学工程]