24 February 2023 Tunable ultrawideband perfect absorber based on vanadium dioxide
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Abstract

An ultrawideband metamaterial perfect absorber based on vanadium dioxide is proposed. It achieves >95 % absorption of vertically incident electromagnetic waves in the range of 3.50 to 10 THz. The absorption intensity can be dynamically adjusted in the range of 0.2% to 99.98% by varying the conductivity of VO2. The mechanism of ultrawideband perfect absorption is interpreted using electric field distribution analysis and impedance-matching theory. The absorption rate related to the structural parameters of the absorber is investigated by numerical simulation. Finally, its polarization angle-insensitive and incidence angle-insensitive properties are demonstrated. This proposed absorber has potential applications in optical switching, electromagnetic stealth, and sensing applications.

© 2023 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yu Cheng, Qichao Gao, Ming Chen, Shijie Deng, Houquan Liu, Chuanxin Teng, Hongyan Yang, Hongchang Deng, and Libo Yuan "Tunable ultrawideband perfect absorber based on vanadium dioxide," Optical Engineering 62(2), 027104 (24 February 2023). https://doi.org/10.1117/1.OE.62.2.027104
Received: 30 November 2022; Accepted: 24 January 2023; Published: 24 February 2023
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KEYWORDS
Absorption

Terahertz radiation

Vanadium

Dielectrics

Magnetism

Optical switching

Electric fields

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