Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8833
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Funding
- University of Maryland [70NANB10H193]
- NIST-CNST [70NANB10H193]
- National Science Foundation (NSF) under CAREER Grant [ECCS-454021, DMR-1309734]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1309734] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1454021] Funding Source: National Science Foundation
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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 <30nm (<10nm 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 (approximate to 3).
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