基于二氧化钒的可调谐太赫兹宽带带通滤波器  

Tunable Terahertz Broadband Bandpass Filter Based on Vanadium Dioxide

作　　者：王岩 陈哲 崔琦 Wang Yan;Chen Zhe;Cui Qi(School of Information Science and Engineering,Yunnan University,Kunming,Yunnan 650500,China)

机构地区：[1]云南大学信息学院,云南昆明650500

出　　处：《光学学报》2021年第20期147-155,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62061051);云南省基础研究计划(202001BB050056,202101AT070187);云南省光电信息技术重点实验室开放基金(YNOE-2018-02);云南大学“东陆中青年骨干教师”培养计划(C176220200)。

摘　　要：提出了一种基于二氧化钒超材料的可调谐宽带带通滤波器。仿真结果表明:该滤波器在中心频率5.19 THz处的3 dB带宽为1.71 THz,最高传输率能够达到0.77,并且在入射角0°~40°范围内具有稳定的宽带传输性能。运用谐振频率处的表面电流分布和等效电路法,阐述了其实现宽带传输的物理机制。由于二氧化钒独特的相变特性,通过改变二氧化钒的电导率,滤波器的带宽可以从1.71 THz动态调谐至2.31 THz。该滤波器具有结构设计简单、宽通带以及可调谐等特性,有望在宽带太赫兹通信、传感以及其他新兴的太赫兹领域发挥重要的作用。A tunable broadband bandpass filter is proposed, which is based on vanadium dioxide(VO;) metamaterial. The simulation results show that the 3 dB bandwidth of this filter is 1.71 THz with the central frequency of 5.19 THz and the largest transmission rate of 0.77. Furthermore, this filter can maintain stable broadband transmission performances within the incidence angles of 0°~40°. The physical mechanism of this kind of filter performance is investigated based on the equivalent circuit of this filter and its surface current distributions at the resonance frequencies. Owing to the unique phase transition property of VO;, the bandwidth of the filter can accordingly change from 1.71 THz to 2.31 THz by tuning the conductivity of VO;. The proposed metamaterial filter possesses the advantages of structural simplicity, broadband performance, and tunable property, which makes it possible to find promising applications in THz communications, sensing and other emerging areas.

关 键 词：光学器件 滤波器 二氧化钒 等效电路 超材料 

分 类 号：O436[机械工程—光学工程]