Regular Article

A tunable dual-band terahertz hybrid metamaterial absorber based on vanadium oxide (VO₂) phase transition

¹ Department of Applied Physics, School of Science, East China Jiaotong University, Nanchang 330013, P.R. China
² Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, P.R. China

^a e-mail: zqcheng_opt@126.com

Received: 17 August 2019
Received in final form: 12 November 2019
Published online: 9 January 2020

Abstract

In the study, a tunable dual-band terahertz hybrid metamaterial absorber was designed and explored. The proposed hybrid metamaterial absorber was composed of an Au ring, an Au cross structure and vanadium dioxide (VO₂) films incorporated at the four ends of the cross structure. Theoretical simulation results showed that the hybrid metamaterial exhibited dual-frequency resonances. The low-frequency resonance was ascribed to the ring, whereas the high-frequency resonance was ascribed to the cross structure. The resonant frequencies of the hybrid metamaterial absorber could be tuned by changing the effective length of electrically resonant cross structure through triggering the insulator–metal phase transition of the VO₂ at the four ends of the cross structure.