Quantum-Coherence-Enhanced Surface Plasmon Amplification by Stimulated Emission of Radiation

TL;DR

This paper demonstrates that quantum coherence can significantly enhance surface plasmon amplification in a silver nanoparticle system, enabling efficient, inversionless nanoplasmonic devices with controllable dynamics.

Contribution

It introduces a method to achieve surface plasmon amplification without population inversion using quantum coherence, advancing nanoplasmonic device control.

Findings

Quantum coherence enhances surface plasmon generation.

Surface plasmon amplification achieved without population inversion.

Coherent drive enables control over plasmon dynamics.

Abstract

We investigate surface plasmon amplification in a silver nanoparticle coupled to an externally driven three-level gain medium, and show that quantum coherence significantly enhances the generation of surface plasmons. Surface plasmon amplification by stimulated emission of radiation is achieved in the absence of population inversion on the spasing transition, which reduces the pump requirements. The coherent drive allows us to control the dynamics, and holds promise for quantum control of nanoplasmonic devices.