Graphene-metasurface for wide-incident-angle terahertz absorption

We demonstrate a graphene-metasurface structure for tunable wide-incident-angle terahertz wave absorption,which involves depositing planar arrays of Omega-shaped graphene patterns on a silicon dioxide substrate.We also discuss how the graphene Fermi-level layer and various substrates affect the absorption characteristics.The absorption of the proposed terahertz absorber is above 80%at an incident angle of 0°–60°in frequencies ranging from 0.82 to 2.0 THz.Our results will be very beneficial in the application of terahertz wave communications and biomedical imaging/sensing systems.