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The design of tunable terahertz absorber realized by phase change film

JIANJUN LIU1, BAOHAI YANG2,*

Affiliation

  1. School of Physics and Mechanical and Electrical Engineering, Shaoguan University, Shaoguan Guangdong 512005 China
  2. College of Physics and Electronic Engineering Guangxi Normal University for Nationalities, Chongzuo532200, China

Abstract

Based on the phase transition characteristics of vanadium dioxide, a multi-resonant tunable terahertz absorber is designed in this paper by combining vanadium dioxide with terahertz metamaterials. With the change in ambient temperature, the conductivity of vanadium dioxide will also change. When the critical value is reached, vanadium dioxide will change from semiconductor state to metallic state. The results show that when the temperature is 40 ℃, the absorber has three absorption peaks, the peak frequencies are 0.613THz, 1.183THz and 1.742 THz, respectively, and the absorptivity at each peak frequency is more than 90%. When the temperature is 67℃, the absorber has two absorption peaks, the peak frequencies are 0.615THz and 1.314THz, respectively, and the absorption effect is good at each peak frequency. This novel type of multi-resonant tunable terahertz waves absorber is expected to play an important role in the future multi-frequency imaging, electromagnetic stealth and other fields..

Keywords

Terahertz, Absorber, Phase, Tunable.

Submitted at: Aug. 23, 2018
Accepted at: Aug. 18, 2020

Citation

JIANJUN LIU, BAOHAI YANG, The design of tunable terahertz absorber realized by phase change film, Journal of Optoelectronics and Advanced Materials Vol. 22, Iss. 7-8, pp. 344-349 (2020)