▎ 摘　　要

We study two-dimensional (2D) hole arrays drilled into a perfect conductor slab covered with a graphene sheet. Such arrays support the extraordinary transmission of electromagnetic waves and allow tunability via graphene properties. We investigate the effect of graphene on transmission spectra by proposing an accurate analytical circuit model for the structure, where the graphene contributes an admittance component at the interface. The model demonstrates how extraordinary transmission can be tuned via the graphene conductivity. We study the free-standing structure, where the hole array is covered by a graphene sheet on both sides of the conductor slab, and a substrate-bound hole array covered by graphene on the exposed slab surface. The results are compared to full-wave simulations, yielding good agreement. In addition, thanks to the proposed circuit model, we demonstrate a polarization-independent perfect absorber by tuning the surface conductivity of graphene.