Suppression of off-resonant cavity feeding through quasi-resonant pumping in a strongly coupled cavity-quantum dot system

TL;DR

This study demonstrates that quasi-resonant excitation significantly reduces off-resonant cavity feeding in a strongly coupled quantum dot-cavity system, highlighting the role of biexcitons and excitation methods in controlling emission properties.

Contribution

It introduces a method to suppress off-resonant cavity feeding using quasi-resonant excitation and analyzes the underlying mechanisms involving biexcitons.

Findings

QRE suppresses cavity feeding by up to 40% compared to ABE.

Cavity feeding ratio is pump power independent under ABE but linearly dependent under QRE.

Biexcitons are identified as key contributors to cavity feeding in QRE.

Abstract

We compare the photoluminescence spectrum of an indium arsenide (InAs) quantum dot (QD) that is strongly coupled to a photonic crystal cavity under above band excitation (ABE) and quasi-resonant excitation (QRE). We show that off-resonant cavity feeding, which manifests itself in a bare cavity emission peak at the strong coupling point, is suppressed by as much as 40% under QRE relative to ABE. We attribute this suppression to a reduced probability of QD charging because electrons and holes are created in pairs inside the QD. We investigate the pump power dependence of the cavity feeding and show that, below saturation, the ratio of the bare cavity emission to polariton emission for ABE is independent of pump power, while for QRE there is linear pump power dependence. These results suggest that the biexciton plays an important role in cavity feeding for QRE.