Tunable microwave absorption of graphene-polymer heterostructures deposited on a epsilon-near-zero metamaterial

Electrodynamics of graphene-PMMA heterostructures on a slab of epsilon-near-zero metamaterial is theoretically worked out. Perfect absorption is achieved once electromagnetic impedance matching condition is fullfilled. Tunability of the absorption can be obtained using a voltage modulation of the effective conductivity of the device. For example, modulation of 40% of absorption/reflectance is shown using voltage beyond the breakdown voltage of the polymer layers.