一种具有多种谐振模式的太赫兹超表面器件

THz-Metasurface Device with Multiple Resonance Modes

摘要:

设计了一种中心对称的分裂环形状超表面结构,该结构具有偏振不敏感和高品质因子的特性。通过理论和实验研究,深入分析了其谐振点的频谱特性,并确定了谐振峰的模式,包括LC、偶极和高阶谐振等。其中,几种高阶谐振模式表现出较高的高品质因数Q(约230),并且对超表面衬底材料的介电常数变化高度敏感。此外,还研究了具有不对称超表面结构的电磁性质,发现通过分别增加超表面结构沿水平轴(x轴)和垂直轴(y轴)的不对称性,可以产生和增强0.332THz和0.210THz的谐振。

Abstract:

An all-in-one design is presented for a polarization-insensitive metasurface with a centrally symmetric split-ring structure for generating various resonant modes. The types of resonant modes (LC, dipole, and higher order resonances) are identified and analyzed by investigating their spectroscopic properties theoretically and experimentally. Several higher-order resonant modes have significantly higher quality factors, Q (~230). These resonant modes are also highly sensitive to the dielectric properties of the surrounding material of the metasurface. Additionally, the EM properties of metasurfaces with asymmetric structures were also investigated. It was found that additional resonant modes at both 0.332 and 0.210THz could be excited and strengthened by increasing the asymmetry of the metasurface structure along the horizontal (x-axis) and vertical axes (y-axis).