Theoretical Investigation of an Ultra-Wideband Tunable Metamaterial Absorber Based on Four Identical Vanadium Dioxide Resonators in the Terahertz Band

A scheme for a terahertz metamaterial absorber is designed which consists of a periodic array of vanadium dioxide (VO 2 ) placed on a continuous gold film separated by a dielectric layer. Taking full advantage of the phase change property of VO 2 , which can be transformed from a metallic state to a...

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Veröffentlicht in:Journal of electronic materials 2023-04, Vol.52 (4), p.2852-2864
Hauptverfasser: Zou, Yuke, Lin, Hongyan, Wu, Yangkuan, Zhu, Huaxin, Zhang, Xiangyang, Wang, Ben-Xin
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container_issue 4
container_start_page 2852
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Lin, Hongyan
Wu, Yangkuan
Zhu, Huaxin
Zhang, Xiangyang
Wang, Ben-Xin
description A scheme for a terahertz metamaterial absorber is designed which consists of a periodic array of vanadium dioxide (VO 2 ) placed on a continuous gold film separated by a dielectric layer. Taking full advantage of the phase change property of VO 2 , which can be transformed from a metallic state to an insulating state, the absorber not only has ultra-wideband absorption, but also has adjustable absorption intensity. According to the simulation results, when VO 2 is in the metallic state, a resonance bandwidth with absorption rate greater than 90% can be reached up to 7.26 THz, from 3.52 THz to 10.78 THz. Its relative absorption bandwidth is 101.54%, which is much larger than previously reported broadband absorbers. Physical mechanism of the ultra-wideband absorption is discussed by analyzing near-field distributions of absorption peaks selected on absorption curve. Size variations of the VO 2 array provide the ability to modulate absorption performance, especially the absorption bandwidth. When VO 2 is in the insulating state, the simulation results show that near-perfect reflection (or near-zero absorption) is obtained, the maximum modulation depth of 97.1% is achieved. The extinction ratio of tunable broadband metamaterial absorber is also estimated. The proposed absorption device with ultra-wideband and tunable absorption features could have great potential for applications in terahertz band.
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When VO 2 is in the insulating state, the simulation results show that near-perfect reflection (or near-zero absorption) is obtained, the maximum modulation depth of 97.1% is achieved. The extinction ratio of tunable broadband metamaterial absorber is also estimated. 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subjects Absorbers
Absorbers (materials)
Absorption
Arrays
Bandwidths
Broadband
Characterization and Evaluation of Materials
Chemistry and Materials Science
Electronics and Microelectronics
Instrumentation
Insulation
Materials Science
Metamaterials
Optical and Electronic Materials
Original Research Article
Solid State Physics
Terahertz frequencies
Ultrawideband
Vanadium dioxide
Vanadium oxides
title Theoretical Investigation of an Ultra-Wideband Tunable Metamaterial Absorber Based on Four Identical Vanadium Dioxide Resonators in the Terahertz Band
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