Circuit model for graphene-based absorber at low-terahertz frequencies

A general circuit model is presented to study the absorption of electromagnetic waves by a graphene-based structure at low-terahertz frequencies. The absorber consists of a monolayer graphene which is printed on the uneven dielectric slabs, with a metallic ground plane placed at the bottom interface. The approach is based on the simple and accurate analytical models for metal strips or patches. Compared with the full-wave electromagnetic simulator software, the proposed method shows high efficiency and the results obtained from the suggested method agree well with those from the full-wave simulations for a normal and oblique incidence. It is very helpful to design novel graphene plasmonic devices in the future.