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arXiv · 1909.01621

Strain tunable single-photon source based on a quantum dot-micropillar system

Magdalena Moczała-Dusanowska·Łukasz Dusanowski·Stefan Gerhardt·Yu Ming He·Marcus Reindl·Armando Rastelli·Rinaldo Trotta·Niels Gregersen·Sven Höfling·Christian Schneider
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Abstract

Scalable quantum photonic architectures demand highly efficient, high-purity single-photon sources, which can be frequency matched via external tuning. We demonstrate a single-photon source based on an InAs quantum dot embedded in a micropillar resonator, which is frequency tunable via externally-applied stress. Our platform combines the advantages of a Bragg micropillar cavity and the piezo-strain-tuning technique enabling single photon spontaneous emission enhancement via the Purcell effect and quantum dot (QD) with tunable wavelength. Our optomechanical platform has been implemented by integration of semiconductor-based QD-micropillars on a piezoelectric substrate. The fabricated device exhibits spontaneous emission enhancement with a Purcell factor of 4.4$\pm$0.7 and allows for a pure triggered single-photon generation with $g^{(2)}(0)$ < 0.07 under resonant excitation. A quantum dot emission energy tuning range of 0.75 meV for 27 kV/cm applied to the piezo substrate has been achieved. Our results pave the way towards the scalable implementation of single-photon quantum photonic technologies using optoelectronic devices.

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Magdalena Moczała-Dusanowska, Łukasz Dusanowski, Stefan Gerhardt, Yu Ming He, Marcus Reindl, Armando Rastelli, Rinaldo Trotta, Niels Gregersen, Sven Höfling, Christian Schneider. 2019-09-04. Strain tunable single-photon source based on a quantum dot-micropillar system. https://doi.org/10.1021/acsphotonics.9b00481

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