Strain tuning of a quantum dot strongly coupled to a photonic crystal cavity

TL;DR

This paper demonstrates reversible strain-tuning of a quantum dot strongly coupled to a photonic crystal cavity, enabling resonance tuning and observation of strong coupling effects through electric field application.

Contribution

It introduces a method for strain tuning of quantum dots in photonic cavities, achieving controlled resonance and strong coupling with minimal cavity shift.

Findings

Quantum dots exhibit an average redshift of 0.45 nm under strain.

Quantum dot resonance can be tuned into cavity resonance, showing anti-crossing.

Cavity resonance shifts only 0.078 nm under maximum strain.

Abstract

We demonstrate reversible strain-tuning of a quantum dot strongly coupled to a photonic crystal cavity. We observe an average redshift of 0.45 nm for quantum dots located inside the cavity membrane, achieved with an electric field of 15 kV/cm applied to a piezo-electric actuator. Using this technique, we demonstrate the ability to tune a quantum dot into resonance with a photonic crystal cavity in the strong coupling regime, resulting in a clear anti-crossing. The bare cavity resonance is less sensitive to strain than the quantum dot and shifts by only 0.078 nm at the maximum applied electric field.