All-optical tuning of a quantum dot in a coupled cavity system

TL;DR

This paper presents an all-optical method to tune a quantum dot into resonance with a cavity mode using a coupled cavity system, resulting in enhanced photon emission and precise control.

Contribution

The study introduces a novel all-optical tuning technique for quantum dots in coupled cavities, enabling resonance adjustment via cavity-enhanced Stark shift.

Findings

27-fold increase in photon emission when tuned into resonance

Maximum tuning achieved is 0.06 nm at 88 μW power

Demonstrates effective all-optical control of quantum dot resonance

Abstract

We demonstrate a method of tuning a semiconductor quantum dot (QD) onto resonance with a cavity mode all-optically. We use a system comprised of two evanescently coupled cavities containing a single QD. One resonance of the coupled cavity system is used to generate a cavity enhanced optical Stark shift, enabling the QD to be resonantly tuned to the other cavity mode. A twenty-seven fold increase in photon emission from the QD is measured when the off-resonant QD is Stark shifted into the cavity mode resonance, which is attributed to radiative enhancement of the QD. A maximum tuning of 0.06 nm is achieved for the QD at an incident power of 88 {\mu}W.