Terahertz lasers based on optically pumped multiple graphene structures with slot-line and dielectric waveguides

TL;DR

This paper proposes and evaluates terahertz lasers using optically pumped multiple-graphene-layer structures integrated with slot-line and dielectric waveguides, demonstrating potential operation above 1 THz at room temperature.

Contribution

It introduces a comprehensive device model for graphene-based THz lasers that includes optical pumping, electron-hole plasma dynamics, and waveguide losses, advancing the design of room-temperature THz sources.

Findings

Lasers can operate at frequencies > 1 THz at room temperature.

The model predicts sufficient gain for lasing under specific conditions.

Waveguide losses are manageable for device operation.

Abstract

Terahertz (THz) lasers on optically pumped multiple-graphene-layer (MGL) structures as their active region are proposed and evaluated. The developed device model accounts for the interband and intraband transitions in the degenerate electron-hole plasma generated by optical radiation in the MGL structure and the losses in the slot or dielectric waveguide. The THz laser gain and the conditions of THz lasing are found. It is shown that the lasers under consideration can operate at frequencies > 1 THz at room temperatures.