We present a compact, fibre-coupled single photon source using gradient-index (GRIN) lenses and an InAsP semiconductor quantum dot embedded within an InP photonic nanowire waveguide. A GRIN lens assembly is used to collect photons close to the tip of the nanowire, coupling the light immediately into a single mode optical fibre. The system provides a stable, high brightness source of fibre-coupled single photons. Using pulsed excitation, we demonstrate on-demand operation with a single photon purity of 98.5% when exciting at saturation in a device with a source-fibre collection efficiency of 35% and an overall single photon collection efficiency of 10%. We also demonstrate "plug and play" operation using room temperature photoluminescence from the InP nanowire for room temperature alignment.
@article{arxiv.2104.11197,
title = {Optical fibre-based (plug-and-play) single photon source using InAsP quantum dot nanowires and gradient-index lens collection},
author = {David B. Northeast and John F. Weber and Dan Dalacu and Jason Phoenix and Philip J. Poole and Geof Aers and Jean Lapointe and Robin L. Williams},
journal= {arXiv preprint arXiv:2104.11197},
year = {2021}
}