Trapping wide-angle circularly polarized waves with giant circular dichroism using a single-channel coherent perfect graphene meta-surface absorber.

Abstract

We propose a single-channel coherent perfect graphene meta-surface absorber to trap circularly polarized (CP) waves perfectly through cascading a polarization converting meta-array and a monolayer graphene sheet. To be more specific, the incident CP waves will be reflected into dual sets of orthogonally linearly polarized (LP) waves, where each group of the same polarized reflecting components can achieve identical amplitudes and a 180^° phase difference at a certain frequency to have coherent absorption. In particular, we show that such a single-channel coherent perfect graphene meta-surface absorber possesses the merits of the wide-angular chiral absorbing capacity of CP waves with giant circular dichroism, thus should pave the way for building up more advanced coherent absorbers and offer more freedom to manipulate CP waves.