Reflection through a parallel-plate waveguide formed by two graphene sheets

Reflection through a dielectric slab located between two graphene sheets is considered. The proposed parallel-plate waveguide is assumed to be symmetric with the substrate and cladding layers are air. The two graphene sheets are considered to be identical and having frequency-dependent surface conductivity σ(ω). The reflection through the proposed structure is investigated with the angle of incidence and the frequency of incident electromagnetic waves.