Ultrafast beam steering based on graphene metamaterial

In this work we demonstrate three different designs of tunable mid-infrared (MIR) beam steering devices based on multilayer graphene-dielectric metamaterials. In all designs the tunable beam steering is achieved by controlling the effective refractive index of the graphene metamaterial, which is done by changing the chemical potential of each graphene layer. The proposed beam steerer concepts allow a wide range of output angles (up to approximately 70 deg) and low reflection losses. The graphene-based tunable beam steering can be used in tunable transmitter/receiver modules for infrared imaging and sensing.