Feasibility of terahertz lasing in optically pumped epitaxial multiple graphene layer structures

TL;DR

This paper investigates the potential of optically pumped multiple-graphene-layer structures on SiC substrates to enable room-temperature terahertz lasing, focusing on their dynamic conductivity and lasing feasibility.

Contribution

It introduces a model for the dynamic conductivity of optically pumped MGL structures and assesses their potential for room-temperature THz lasing.

Findings

Dynamic conductivity depends on frequency, number of layers, and pump intensity.

Optically pumped MGL structures could achieve lasing around 1 THz at room temperature.

High efficiency of the proposed structure supports practical THz laser development.

Abstract

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. The dynamic conductivity of the MGL structure is calculated as a function of the signal frequency, the number of GLs, and the optical pumping intensity. The utilization of optically pumped MGL structures might provide the achievement of lasing with the frequencies of about 1 THz at room temperature due to a high efficiency.