VO2-Graphene based four-state ultra-wideband terahertz metamaterial with switchable absorption, reflection, and transmission

IF 2.7 Q2 PHYSICS, CONDENSED MATTER

Micro and Nanostructures Pub Date : 2025-03-10 DOI:10.1016/j.micrna.2025.208143

Jian Shen, Han Li, Xuejun Qiu, Junjiao Lu, Yi Wang, Chengzhi Jin

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引用次数: 0

Abstract

A multifunctional ultra-wideband (UWB) terahertz (THz) metamaterial device based on VO₂ and graphene is proposed, capable of achieving tunable and switchable high-frequency absorption broadband (HFBA)/low-frequency broadband absorption (LFBA)/reflection/transmission in the THz band. The mechanism is clearly explained by impedance matching theory, the electric field strength distributions (EFSDs) and equivalent simplified model. Based on the simulation results, the localized surface plasmon resonance (LSPR) of the patterned graphene reaches LFBA above 90 % between 2.42 and 4.83 THz, and the absorptivity can be changed from 19 % to 99 % by varying the graphene's Fermi level. The electric and magnetic resonances produce HFBA with an adjustable absorption amplitude between 17 % and 98 % in the 3.02–7.86 THz range by controlling the conductivity of the annular VO₂. In addition, reflection and transmission can be adjusted between 0 % and 80 %. The proposed metamaterial device exhibits strong polarization- and angle-of-incidence-independent properties, ensuring its stable application in intelligent absorption and electromagnetic shielding.

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基于vo2 -石墨烯的四态超宽带太赫兹超材料，具有可切换的吸收、反射和传输

提出了一种基于VO2和石墨烯的多功能超宽带（UWB）太赫兹（THz）超材料器件，能够在太赫兹波段实现可调谐和可切换的高频吸收宽带(HFBA)/低频宽带吸收(LFBA)/反射/传输。通过阻抗匹配理论、电场强度分布理论和等效简化模型对其机理进行了解释。模拟结果表明，在2.42 ~ 4.83 THz范围内，石墨烯的局部表面等离子体共振（LSPR）达到90%以上的LFBA，并且通过改变石墨烯的费米能级，其吸收率可以从19%改变到99%。在3.02 ~ 7.86 THz范围内，通过控制环形VO2的电导率，产生了可调吸收幅度在17% ~ 98%之间的HFBA。另外，反射和透射可以在0% ~ 80%之间调节。所提出的超材料器件具有较强的与极化和入射角无关的特性，保证了其在智能吸收和电磁屏蔽方面的稳定应用。

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来源期刊

Micro and Nanostructures

CiteScore

6.50

自引率

0.00%

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