Broadband tunable terahertz metamaterial absorber based on vanadium dioxide and Fabry-Perot cavity

被引：47

作者：

Zhang, Heng ^{[1
]}

Ling, Fang ^{[1
]}

Zhang, Bin ^{[1
]}

机构：

[1] Sichuan Univ, Coll Elect & Informat Engn, Chengdu 610065, Peoples R China

来源：

OPTICAL MATERIALS | 2021年 / 112卷

关键词：

Metamaterial absorber; Broadband absorption; Vanadium dioxide; Fabry-Perot cavity;

D O I：

10.1016/j.optmat.2021.110803

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A tunable broadband metamaterial absorber is proposed based on the vanadium dioxide and Fabry-Perot cavity in the terahertz region. To broaden the absorption bandwidth, the dielectric coating is employed on the top of vanadium dioxide squares to form the Fabry-Perot cavity for improving the impedance matching and further triggering an additional resonance frequency. The simulation results indicate that the bandwidth of absorption over 90% reaches 3.43 THz with a central frequency of 2.645 THz and the corresponding relative bandwidth is 129.7% under normal incidence. The absorption peak can be approximately tuned from 8% to 100% by changing the conductivity of vanadium dioxide. Moreover, it is polarization-insensitive, and exhibits absorption performance of working at wide-angle incidence. This design method can serve as a reference to research tunable and broadband terahertz devices.

引用

页数：6