Research Article
Simple Design of a Tunable Quadruple-Broadband Terahertz Metamaterial Absorber Based on VO2
Kwang-Jin Ri*,
Dae-Song Pak,
Chung-Ho Ri
Issue:
Volume 12, Issue 4, December 2023
Pages:
45-52
Received:
18 October 2023
Accepted:
9 November 2023
Published:
21 November 2023
Abstract: Tunable multi-broadband terahertz (THz) metamaterial absorbers (MAs) can effectively act as THz amplitude modulators, which are the essential components for the future THz communication systems. Till now, various tunable multi-broadband THz MAs including tunable dual-broadband and triple-broadband absorbers have been investigated. However, there are few researches on tunable quadruple-broadband THz MAs. In this work, a simple design of tunable quadruple-broadband THz MA based on VO2 is proposed. The proposed absorber possesses four broad absorption bands with absorptivity over 90% in frequency ranges of 0.54-2.30 THz, 3.67-5.33 THz, 6.72-8.4 THz and 9.72-11.47 THz, and the corresponding absorption bandwidths reach 1.76 THz, 1.66 THz, 1.68 THz and 1.75 THz, respectively. Moreover, we can dynamically control the absorptivity of four absorption bands by varying VO2 conductivity. Thus, the proposed absorber possesses the modulation depths of 79.15%, 49.71%, 33.03% and 21.98% at 1.48 THz, 4.46 THz, 7.45 THz and 10.44 THz, respectively. The physical origin of quadruple-broadband perfect absorption is revealed with aid of electric field distributions at resonant frequencies. We also investigate the effects of incidence angle and polarization angle on the quadruple-broadband perfect absorption. The proposed absorber has broad application prospects in THz imaging, modulating, detecting and sensing owing to its excellent absorption characteristics.
Abstract: Tunable multi-broadband terahertz (THz) metamaterial absorbers (MAs) can effectively act as THz amplitude modulators, which are the essential components for the future THz communication systems. Till now, various tunable multi-broadband THz MAs including tunable dual-broadband and triple-broadband absorbers have been investigated. However, there ar...
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