Radiative emission dynamics of quantum dots in a single cavity micropillar

TL;DR

This study investigates how quantum dots embedded in micropillars emit light, revealing non-exponential decay behaviors and the transition from spontaneous to stimulated emission through time-resolved spectroscopy and microscopic theory.

Contribution

It provides a detailed analysis of emission dynamics and introduces a microscopic model explaining non-exponential decay and intensity dependence in quantum dot emission.

Findings

Decay rate depends on excitation intensity

Transition from spontaneous to stimulated emission observed

Non-exponential decay behavior characterized

Abstract

The light emission of self-assembled (In,Ga)As/GaAs quantum dots embedded in single GaAs-based micropillars has been studied by time-resolved photoluminescence spectroscopy. The altered spontaneous emission is found to be accompanied by a non-exponential decay of the photoluminescence where the decay rate strongly depends on the excitation intensity. A microscopic theory of the quantum dot photon emission is used to explain both, the non-exponential decay and its intensity dependence. Also the transition from spontaneous to stimulated emission is studied.