Title |
Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission
|
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Published in |
Nature Communications, July 2015
|
DOI | 10.1038/ncomms8833 |
Pubmed ID | |
Authors |
Luca Sapienza, Marcelo Davanço, Antonio Badolato, Kartik Srinivasan |
Abstract |
Self-assembled, epitaxially grown InAs/GaAs quantum dots (QDs) are promising semiconductor quantum emitters that can be integrated on a chip for a variety of photonic quantum information science applications. However, self-assembled growth results in an essentially random in-plane spatial distribution of QDs, presenting a challenge in creating devices that exploit the strong interaction of single QDs with highly confined optical modes. Here, we present a photoluminescence imaging approach for locating single QDs with respect to alignment features with an average position uncertainty <30 nm (<10 nm when using a solid-immersion lens), which represents an enabling technology for the creation of optimized single QD devices. To that end, we create QD single-photon sources, based on a circular Bragg grating geometry, that simultaneously exhibit high collection efficiency (48%±5% into a 0.4 numerical aperture lens, close to the theoretically predicted value of 50%), low multiphoton probability (g((2))(0) <1%), and a significant Purcell enhancement factor (≈3). |
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Researcher | 42 | 13% |
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Student > Doctoral Student | 14 | 4% |
Other | 37 | 12% |
Unknown | 63 | 20% |
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