Ultra-wideband tunable metamaterial perfect absorber based on vanadium dioxide

A dynamically adjustable ultra-wideband metamaterial perfect absorber (MPA) is proposed which consists of three resonance rings based on vanadium dioxide (VO2) and a metal ground layer separated by a dielectric spacer. The simulation results show that the terahertz (THz) absorption bandwidth of more...

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Veröffentlicht in:	Optics express 2021-01, Vol.29 (2), p.2703-2711
Hauptverfasser:	Wu, Guozhang, Jiao, Xiaofei, Wang, Yuandong, Zhao, Zeping, Wang, Yibo, Liu, Jianguo
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Sprache:	eng
Schlagworte:	Optics Physical Sciences Science & Technology
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creator	Wu, Guozhang Jiao, Xiaofei Wang, Yuandong Zhao, Zeping Wang, Yibo Liu, Jianguo
description	A dynamically adjustable ultra-wideband metamaterial perfect absorber (MPA) is proposed which consists of three resonance rings based on vanadium dioxide (VO2) and a metal ground layer separated by a dielectric spacer. The simulation results show that the terahertz (THz) absorption bandwidth of more than 90% absorptance reaches 3.30 THz, which covers from 2.34 to 5.64 THz, under different incident polarization angles. The range is better than that of previous VO2-based reports. Moreover, when the conductivity of VO2 changes from 200 S/m to 2x10(5) S/m, the absorption peak intensity can be adjusted continuously from 4% to 100%. The key is to optimize the geometric structure through interference cancellation and impedance matching theory, to achieve better absorption bandwidth and efficiency. Besides, the terahertz absorber has a wide-angle absorption effect both in TE and TM waves. Thus, the designed absorber may have many potential applications in modulating, sensing and imaging technology. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
doi_str_mv	10.1364/OE.416227
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title	Ultra-wideband tunable metamaterial perfect absorber based on vanadium dioxide
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