Terahertz emission and detection in double-graphene-layer structures

The authors discuss the photon-assisted resonant radiative intergraphene layer transitions for applications of double-graphene-layer (D-GL) heterostructures for THz/IR lasers and photodetectors (PDs). The main element of both lasers and PDs under consideration is a D-GL core-shell heterostructure with the independently contacted GLs separated by the thin transparent tunnel-barrier layer. The bias voltage applied between the GL´s contacts induces the electron and hole gases in the opposing GLs. The electron and hole densities in GLs are controlled by the gate voltage.