All-analytical semiclassical theory of spaser for plasmonic nanocavity

TL;DR

This paper develops an all-analytical semiclassical theory to understand and optimize the energy exchange and performance of spasers in plasmonic nanocavities, aiding the design of nanoscale light sources.

Contribution

It introduces a comprehensive analytical framework for spasers in plasmonic nanocavities, enhancing understanding and design capabilities.

Findings

Provides a quantitative explanation of energy exchange in spasers.

Enables better design of nanolasers and spasers.

Facilitates understanding of light-matter interactions at nanoscale.

Abstract

Experimental approaches to manipulate light-matter interaction at nanoscale have quickly advanced in recent years, leading to the demonstration of spaser (surface plasmon amplification by stimulated emission of radiation) in plasmonic nanocavities. Yet, a well-understood analytical theory to better understand and quantitatively explain the connotation of spaser system is urgently needed. Here we develop an all-analytical semiclassical theory to investigate the energy exchange between active materials and fields and the spaser performance in a plasmonic nanocavity. The theory can be commonly used in understanding and designing all novel microlaser, nanolaser, and spaser systems.