Optical fibre-based (plug-and-play) single photon source using InAsP quantum dot nanowires and gradient-index lens collection

• URL: http://arxiv.org/abs/2104.11197v1
• Date: Thu, 22 Apr 2021 17:29:08 GMT
• Title: Optical fibre-based (plug-and-play) single photon source using InAsP quantum dot nanowires and gradient-index lens collection
• Authors: David B. Northeast, John F. Weber, Dan Dalacu, Jason Phoenix, Philip J. Poole, Geof Aers, Jean Lapointe, and Robin L. Williams
• Abstract summary: 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. 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%.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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