Spaser Based on Graphene Capillary

TL;DR

This paper introduces a graphene-based spaser structure, develops an electrostatic model for plasmonic modes, and provides an analytical framework and design procedure for creating spasers at specific frequencies.

Contribution

It presents a novel graphene spaser structure, an electrostatic quantization model, and an algorithmic design method for targeted frequency operation.

Findings

Spasing occurs at frequencies with high Quality factor.

Analytical spasing condition derived.

Design procedure enables custom spaser creation.

Abstract

In this paper, we propose a structure for graphene spaser and develop an electrostatic model for quantizing plasmonic modes. Using this model, one can analyze any spaser consisting of graphene in the electrostatic regime. The proposed structure is investigated analytically and the spasing condition is derived. We show that spasing can occur in some frequencies where the Quality factor of plasmonic modes is higher than some special minimum value. Finally, an algorithmic design procedure is proposed, by which one can design the structure for a given frequency. As an example, a spaser with plasmon energy of 0.1 eV is designed.