Tuning emission energy and fine structure splitting in quantum dots emitting in the telecom O-band

TL;DR

This study demonstrates the ability to tune emission wavelengths and cancel fine-structure splitting in InGaAs/GaAs quantum dots emitting in the telecom O-band, advancing quantum communication technologies.

Contribution

It introduces a piezoelectric tuning method that preserves optical quality and enables precise control of quantum dot emission properties at telecom wavelengths.

Findings

Successful spectral tuning of quantum dots

Cancellation of fine-structure splitting achieved

Maintained optical quality after tuning

Abstract

We report on optical investigations of MOVPE-grown InGaAs/GaAs quantum dots emitting at the telecom O-band that were integrated onto uniaxial piezoelectric actuators. This promising technique, which does not degrade the optical quality or performances of the quantum emitters, enables us to tune the quantum dot emission wavelengths and their fine-structure splitting. By spectrally analyzing the emitted light with respect to its polarization, we are able to demonstrate the cancelation of the fine structure splitting within the experimental resolution limit. This work represents an important step towards the high-yield generation of entangled photon pairs at telecommunication wavelength, together with the capability to precisely tune the emission to target wavelengths.