Anomalous Purcell decay of strongly driven inhomogeneous emitters coupled to a cavity

TL;DR

This paper investigates how strong driving and inhomogeneity affect the Purcell decay in a cavity-coupled erbium ensemble, revealing an unexpected suppression of decay rate at high pump power.

Contribution

It demonstrates the anomalous suppression of Purcell decay in a strongly driven inhomogeneous emitter ensemble and models this effect with a Tavis-Cummings framework.

Findings

Three-fold suppression of Purcell factor at high pump power

Suppression occurs at zero cavity detuning

Qualitative agreement with Tavis-Cummings model

Abstract

We perform resonant fluorescence lifetime measurements on a nanocavity-coupled erbium ensemble as a function of cavity-laser detuning and pump power. Our measurements reveal an anomalous three-fold suppression of the ensemble Purcell factor at zero cavity detuning and high pump fluence. We capture qualitative aspects of this decay rate suppression using a Tavis-Cummings model of non-interacting spins coupled to a common cavity.