基于温度控制的可切换宽带太赫兹吸波器  

Switchable Broadband Terahertz Absorber Based on Temperature Control

作　　者：朱广 霍跃华[4] 史艳琼[1,2,3] Zhu Guang;Huo Yuehua;Shi Yanqiong(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China;Key Laboratory of Construction Machinery Fault Diagnosis and Early Warning Technology,Anhui Jianzhu University,Hefei,Anhui 230601,China;Key Laboratory of Intelligent Manufacturing of Construction Machinery y Hefei,Anhui 230601,China;Network and Information Center,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]安徽建筑大学机械与电气工程学院,安徽合肥230601 [2]安徽建筑大学建筑机械故障诊断与预警重点实验室,安徽合肥230601 [3]工程机械智能制造重点实验室,安徽合肥230601 [4]中国矿业大学(北京)网络与信息中心,北京100083

出　　处：《激光与光电子学进展》2021年第13期371-377,共7页Laser & Optoelectronics Progress

基　　金：安徽省高校协同创新计划项目(GXXT-2019-020);国家重点研发计划项目(2018YFB2003801)。

摘　　要：为了实现宽带吸波器的动态可调功能,设计出一种由顶层"方环内嵌十字"、二氧化硅介质层以及二氧化钒薄膜底层组成的对称吸波器结构。在2~4 THz范围内,通过调节二氧化钒薄膜底层的电导率可以实现由低于10%的吸收效率调整至高于90%的吸收效率,切换调制深度大于65%。在宽频带范围内,可以实现动态切换该器件的反射和完美吸收功能。仿真结果表明,该吸波器具有宽角度特性和极化不敏感特性,入射角度范围达到75°。基于以上优点,该吸收器在智能衰减器、反射器以及空间调制器等太赫兹器件应用方面有巨大的潜力。To realize the dynamic adjustable function of the broadband absorber, this paper proposes and designs a symmetrical absorber structure composed of a square top layer with embedded cross, a SiO2 dielectric layer, and a VO2 bottom layer. In the range from 2 THz to 4 THz, the absorption efficiency of the device can be adjusted from less than 10% to more than 90% by adjusting the conductivity of the bottom layer of VO2, and its switching modulation depth is greater than 65%. In a wide frequency range, the device can be dynamically switched between the reflector and perfect absorber modes. The simulation results show that the absorber has wide-angle and polarization-insensitive characteristics, and the incident angle range of electromagnetic waves to the absorber can reach 75°. Based on the above advantages, the absorber has great potential in terahertz device applications such as smart attenuators, reflectors, and spatial modulators.

关 键 词：材料 二氧化钒 宽带吸收器 可切换功能 极化不敏感特性 太赫兹 

分 类 号：TB34[一般工业技术—材料科学与工程]