A dynamically adjustable broadband terahertz absorber based on a vanadium dioxide hybrid metamaterial

Yongchen Liu; Yixian Qian; Fangrong Hu; Mingzhu Jiang; Longhui Zhang

Results in Physics (Dec 2020)

A dynamically adjustable broadband terahertz absorber based on a vanadium dioxide hybrid metamaterial

Yongchen Liu,
Yixian Qian,
Fangrong Hu,
Mingzhu Jiang,
Longhui Zhang

Affiliations

Yongchen Liu: Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China
Yixian Qian: Key Laboratory of Optical Information Detecting and Display Technology, Zhejiang Normal University, Jinhua 321004, China
Fangrong Hu: Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China; Hunan Engineering Technology Research Center of Optoelectronic Health Detection, College of Electronic Information and Electrical Engineering, Changsha University, Changsha 410022, China; Corresponding author at: Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China.
Mingzhu Jiang: Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China
Longhui Zhang: Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China

Journal volume & issue: Vol. 19
p. 103384

Abstract

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A dynamically adjustable terahertz (THz) broadband absorber based on a vanadium dioxide (VO2) hybrid metamaterial is theoretically designed. During the design, we first consider working frequency, bandwidth, excitation method and fabrication process. And then, a commercialized full wave electromagnetic (EM) calculation software CST microwave 2019 based on finite integration technology is used to simulate and optimize the performance of the device. Due to the device is excited by light, it consists of a top layer of VO2 oblique-split-ring-resonator (OSRR) array, a polyimide (PI) spacer and a bottom metal film. The simulation results show that, when the VO2 changes from insulating state to metal state under light stimulus, the absorption increases from 3% to over 90%. Meanwhile, when the VO2 is in metallic phase, the bandwidth of absorption greater than 90% reaches to 1.0 THz and the relative bandwidth is about 83%. The potential applications of the device are active EM stealth, THz wave detection and thermal imaging. This work paves a new way for simply constructing a low-cost dynamically adjustable THz broadband absorber.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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