Laser & Optoelectronics Progress, Volume. 58, Issue 21, 2116002(2021)
Tunable Broadband Terahertz Perfect Absorber Design Based on Vanadium Dioxide
A broadband terahertz (THz) perfect absorber that can be dynamically adjustable is designed. The absorber consists of a cross-shaped vanadium dioxide layer, metal ground plane, and sandwiched silicon dioxide layer. Simulation results indicate that a bandwidth of 1.06 THz (ranging from 0.71 to 1.77 THz) provides greater than 90% absorption. The absorptivity varies with VO2 conductivity and can be dynamically adjusted from 4% to 99.5%. To obtain the physical mechanism of the absorber operation, impedance matching theory and wave-interference theory are introduced, and the physical source of the two perfect absorption peaks is analysed by electric field distribution. The absorber has the characteristics of wide-angle absorption and polarisation insensitivity and can be used in THz sensors, detectors, and stealth equipment.
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Ting Zhang, Ting Zhang, Sen Yang, Sen Yang, XinYing Yu, XinYing Yu. Tunable Broadband Terahertz Perfect Absorber Design Based on Vanadium Dioxide[J]. Laser & Optoelectronics Progress, 2021, 58(21): 2116002
Category: Materials
Received: May. 2, 2021
Accepted: Jun. 9, 2021
Published Online: Nov. 17, 2021
The Author Email: Zhang Ting (zhangting_cai@163.com), Zhang Ting (zhangting_cai@163.com)