单光子源
量子点
光子
纳米线
光电子学
材料科学
光学
光子学
亮度
波导管
镜头(地质)
光致发光
物理
作者
David B. Northeast,Dan Dalacu,John Weber,Jason Phoenix,Jean Lapointe,Geof C. Aers,Philip J. Poole,Robin L. Williams
标识
DOI:10.1038/s41598-021-02287-y
摘要
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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