Flexibly manipulating the polarization independent plasmon-induced transparency in a graphene and strontium titanate integrated terahertz metasurface

Abstract We propose a graphene and strontium titanate (STO) integrated terahertz metasurface that can achieve the flexible manipulation of plasmon-induced transparency (PIT) effect. The proposed structure consists of a doped Si substrate, a SiO 2 spacer, and a STO film with graphene antennas and Indium-Tin-Oxide (ITO) nanowhiskers electrodes patterned on it. By separately biasing the graphene antennas, the bright-bright mode coupled PIT effect is achieved. By flexibly configuring the Fermi energy distributions on the graphene antennas, the shape of PIT spectrum is also flexibly manipulated. Moreover, the working frequency band can be shifted by changing the environmental temperature due to the temperature dependent permittivity of the STO film. Our findings are beneficial in designing flexibly manipulated THz devices.