Polarization Insensitive Electromagnetically Induced Transparency in Topological Insulator Metasurface

Electromagnetically induced transparency (EIT) is widely studied in atomic systems and metamaterials. However, there are few studies of EIT on topological insulator (TI). In this paper, the EIT effect is studied in TI which is placed on the dielectric substrate by finite difference time domain (FDTD) method. We discussed the effective permittivity of TI layer on different temperature at terahertz (THz) range. The EIT-like phenomenon can be obtained at transverse electromagnetic (TE) and transverse magnetic (TM) mode. The parameters of dielectric substrate and TI layer are investigated to tune the EIT phenomenon. Moreover, incident angle of electromagnetic (EM) wave is also studied to influence the transmission of the structure. The result was shown the large incident angle and polarization insensitive EIT effect can be realized. The results can provide some potential applications such as terahertz switches, filters and terahertz communications.