Reconfigurable Graphene-Based metasurface for THz transmission angle control

A reconfigurable transmissive metasurface with a gradient phase variation based on the interaction between metal and graphene is proposed. The unit cell is composed of four very thin identical transparent layers in which a metal film with circular slot is used. By the use of graphene sectors etched in four symmetrical places of the slot, it is possible to change the resonance frequency and subsequently the phase of the incident wave. Depending on the working frequency and the structure dimensions, the incident plane wave could be transmitted in the desired direction or converted to surface waves.