In this paper, we discuss the isotropic chiroptical response of two-layered metasurfaces with $n$-fold dihedral symmetries of resonators (${D_n}$) in the terahertz (THz) range. The analysis of numerical calculations is based on the homogenization model through effective polarizability approximation. We reveal the impact of resonator symmetry on circular dichroism and polarization anisotropy of the metasurface. In particular, it is shown that an increase in the symmetry order of a metasurface unit cell leads to a proportional resonance red shift in circular dichroism spectra. This research has both fundamental and applied relevance, and may enable the realization of THz devices capable of polarization manipulation or possessing polarization sensitive features.

中文翻译：

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具有不同二面角对称性的双层太赫兹手性超表面

在本文中，我们讨论了谐振器（$ {D_n} $）在太赫兹（THz）范围内具有$ n $倍二面角对称性的两层超表面的各向同性整脊响应。数值计算的分析基于均化模型，通过有效的极化率近似。我们揭示了共振器对称性对超二表面的圆二色性和极化各向异性的影响。特别地，表明超颖表面晶胞的对称顺序的增加导致圆二色性光谱中的比例共振红移。这项研究具有基础和应用的相关性，并可能使能够实现极化操作或具有极化敏感特性的太赫兹器件得以实现。