A vanadium dioxide-assisted switchable multifunctional metamaterial structure
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摘要:
本文提出了一种基于二氧化钒(VO2)相变特性的开口谐振环结构多功能超材料器件。该器件由VO2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。VO2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VO2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。
Abstract:In this paper, a multifunctional metamaterial device based on the phase transition properties of vanadium dioxide (VO2) is proposed. The metamaterial structure consists of a top layer combined with VO2-filled Split Ring Resonator (SRR) and a metal cross, a polyimide (PI) dielectric layer, and a metal substrate. When the VO2is in the insulating state, the cross-polarization conversion function can be realized, and its Polarization Conversion Rate (PCR) is greater than 90% in the range of 0.48-0.87 THz. When the VO2is 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.
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图 8吸收器用作传感器时的性能分析。(a)吸收特性随待测样品折射率的变化情况;(b)1.64 THz频率处的传感特性;(c)2.15 THz频率处的传感特性
Figure 8.Performance analysis of the absorber when it is used as a sensor. (a) The variation of absorption with the refractive index of the sample; (b) the sensing characteristics at the frequency of 1.64 THz; (c) the sensing characteristics at the frequency of 2.15 THz
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