基于SWCNTs薄膜的多谐振环太赫兹超表面传感特性

THz metasurface sensing characteristics of multiple resonant rings based on Single-Walled Carbon Nanotubes films

摘要:

基于单壁碳纳米管(SWCNTs)薄膜，构建了一种具有多频窄带共振效应的新型太赫兹(THz)超表面。深入分析了周期性微结构单元参数对超表面的共振特性的影响；通过仿真及理论计算对器件的共振耦合机理进行研究，二者具有较好的一致性。通过在超表面覆盖不同折射率的介质层，分析这种THz超表面器件的折射率传感特性，灵敏度分析结果显示，该超表面器件可实现最高64 GHz/RIU的折射率传感。

Abstract:

A novel terahertz(THz) metasurface with multi-frequency narrow band resonance effect is constructed based on Single-Walled Carbon Nanotubes(SWCNTs) thin films. The influence of structural parameters of periodic microstructure unit on the resonance characteristics of the metasurface is analyzed. Furthermore, the resonance coupling mechanism of the device is studied, and the simulation and theoretical calculations have good consistency. In addition, the refractive index sensing characteristics of this THz metasurface device are analyzed by covering a dielectric layer with different refractive indexes on the metasurface. The function fitting results show that the metasurface device can achieve high sensitivity refractive index sensing up to 64 GHz/RIU.