Polarization-Independent Plasmon-Induced Transparency in a Fourfold Symmetric Terahertz Metamaterial

This is the authors' abstract. We don't add key points for this paper.

Metamaterials that reveal fascinating and unique resonant properties allow for adequate control of electromagnetic waves at will. Recently, considerable studies have shown that the plasmon-induced transparency (PIT) effect can be realized by metamaterials via destructive interference between different resonance modes; however, most of them are sensitive to the polarization of incident wave. Here, we demonstrate a polarization-independent PIT metamaterial functioning in the terahertz regime. The proposed structure has a fourfold symmetry and exhibits a typical PIT behavior due to the coupling effect of four different modes, yielding polarization-independent characteristics.