二氧化钒辅助的可切换多功能超材料结构

A vanadium dioxide-assisted switchable multifunctional metamaterial structure

本文提出了一种基于二氧化钒(VO_(2))相变特性的开口谐振环结构多功能超材料器件。该器件由VO_(2)填充的开口谐振环和中心放置十字的顶层、聚酰亚胺(PI)介质层和金属基底构成。VO_(2)在绝缘态时,可以实现交叉极化转换功能,在0.48~0.87 THz范围内,偏振转换率大于90%。当VO_(2)为金属态时,该器件能够实现双频吸收和高灵敏度传感功能。在1.64 THz和2.15 THz频率处的吸收率大于88%。通过改变样品材料的折射率,两个频率点处的传感灵敏度分别约为25.6 GHz/RIU和159 GHz/RIU,品质因子Q分别为71.34和23.12。所提出的超材料多功能器件具有结构简单、可切换功能和高效率极化转换等特性,在未来太赫兹通信、成像等领域都有潜在的应用价值。

In this paper,a multifunctional metamaterial device based on the phase transition properties of vanadium dioxide(VO_(2))is proposed.The metamaterial structure consists of a top layer combined with VO_(2)-filled Split Ring Resonator(SRR)and a metal cross,a polyimide(PI)dielectric layer,and a metal substrate.When the VO_(2)is in the insulating state,the cross-polarization conversion function can be realized,and its Po-larization Conversion Rate(PCR)is greater than 90%in the range of 0.48-0.87 THz.When the VO_(2)is in the metallic state,the device can realize dual-frequency absorption and be applied in high-sensitivity sensing functions.The absorption rates are higher than 88%at the frequencies of 1.64 THz and 2.15 THz.By changing the refractive index of the sample material,the sensing sensitivities at the two related frequencies are about 25.6 GHz/RIU and 159 GHz/RIU,and the Q-factors are 71.34 and 23.12,respectively.The proposed metamaterial multifunctional device exhibits the advantages of a simple structure,a switchable function,and high-efficiency polarization conversion,and provides potential application value in future terahertz communication,imaging and other fields.