Design Strategy for Graphene Metasurface Wideband Tunable THz Absorber

The design of a simple and efficient metasurface absorber at terahertz (THz) frequencies is an extremely difficult job. In this work, an effort has been made to design and investigate a new kind of absorber with the aid of a graphene-inspired tunable metasurface at THz frequencies. Critical performance analysis of absorber has been carried out in terms of absorptivity, normalized impedance, polarization insensitivity, and angular stability. A graphene-metasurface absorber has been found to possess an absorptivity of 96% at 6.1 THz with a corresponding absorption bandwidth of 1.4 THz. The total thickness of the absorber is only 10.2 µm accomplished with the help of a very simple design. Besides, the impact of graphene's chemical potential has been studied up to 0.7eV. The outcomes reflect the tremendous capability of the proposed metasurface configuration for THz applications.