Suppression of background emission for efficient single-photon generation in micropillar cavities

We optimize the efficiency of a quantum-dot-based micropillar single-photon source by minimizing the spontaneous emission into unwanted background modes. We perform a numerical investigation of the background emission, where we identify a semi-periodic enhancement with the diameter. At these peaks o...

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Bibliographic Details
Published in:Applied physics letters 2021-03, Vol.118 (11)
Main Authors: Wang, Bi-Ying, Häyrynen, Teppo, Vannucci, Luca, Jacobsen, Martin Arentoft, Lu, Chao-Yang, Gregersen, Niels
Format: Article
Language:English
Subjects:
Applied physics
Diameters
Emission analysis
Emissions control
Photons
Quantum dots
Spontaneous emission
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Summary:We optimize the efficiency of a quantum-dot-based micropillar single-photon source by minimizing the spontaneous emission into unwanted background modes. We perform a numerical investigation of the background emission, where we identify a semi-periodic enhancement with the diameter. At these peaks of the background emission, the efficiency is reduced by ∼20%, and we show how this reduction can be avoided simply by choosing a diameter away from the peaks. Finally, we analyze the discrepancy between the Purcell factor estimated from experimental lifetime measurements and the true Purcell factor.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0044018