Proposed Graphene Nanospaser

TL;DR

This paper proposes a graphene-based nanospaser that uses a multi-quantum well system to generate coherent surface plasmons at near-infrared frequencies, combining graphene's properties with quantum well design.

Contribution

It introduces a novel graphene spaser design utilizing a multi-quantum well system, demonstrating feasibility at realistic parameters and specific plasmon frequencies.

Findings

Graphene monolayer coupled with multi-quantum wells can form a coherent plasmon generator.

Spasing can be achieved at a plasmon frequency of 0.15 eV with realistic doping.

The design is similar to quantum cascade laser active elements.

Abstract

We show that graphene monolayer coupled to multi-quantum well system can form a graphene spaser, which is a coherent quantum generator of surface plasmons in graphene. The active element of graphene spaser is a multi-quantum well system with a design similar to the design of an active element of quantum cascade laser. Under realistic parameters of the multi-quantum well system, the spasing in graphene monolayer can be achieved at a finite doping of graphene and at a plasmon frequency, 0.15 eV, close to the typical frequency of intersubband transitions in multi-quantum well systems.