V. Ya. Aleshkin

TL;DR: In this paper, surface plasmons (SPs) propagating along optically pumped single-graphene layer (SGL) and MGL structures were analyzed and it was shown that at sufficiently strong optical pumping when the real part of the dynamic conductivity of SGL and Mgl structures becomes negative in the terahertz (THz) range of frequencies due to the interband population inversion, the damping of the THz SPs can give way to their amplification.

TL;DR: In this paper, a multiple graphene layer (MGL) structure with a stack of GLs and a highly conducting bottom GL on SiC substrate pumped by optical radiation is considered as an active region of terahertz and far infrared lasers with external metal mirrors.

TL;DR: In this paper, a multiple-graphene-layer (MGL) structure with a stack of GLs and a highly conducting bottom GL on SiC substrate pumped by optical radiation is considered as an active region of terahertz (THz) and far infrared (FIR) lasers with external metal mirrors.

TL;DR: In this article, the concept of terahertz (THz) laser enabled by the resonant electron radiative transitions between graphene layers (GLs) in double-GL structures was proposed and substantiated.

TL;DR: In this article, a terahertz laser based on optically pumped graphene layer and bilayer as the active media and suggested waveguide structure is considered. And the authors calculate the spectral dependences of the dynamic conductivity of the bilayer associated with the interband and intraband transitions, and estimate the pumping optical power required for lasing.