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Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission

Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission
Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission
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).
1-8
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac
Davanco, Marcelo
cfacc6c8-a09b-4b66-95e5-074b69930d91
Badolato, Antonio
73373515-ce29-49dc-9137-412c5f55a574
Srinivasan, Kartik
419dfd1a-2440-44de-9530-7aaa9383bc15
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac
Davanco, Marcelo
cfacc6c8-a09b-4b66-95e5-074b69930d91
Badolato, Antonio
73373515-ce29-49dc-9137-412c5f55a574
Srinivasan, Kartik
419dfd1a-2440-44de-9530-7aaa9383bc15

Sapienza, Luca, Davanco, Marcelo, Badolato, Antonio and Srinivasan, Kartik (2015) Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission. Nature Communications, 6 (7833), 1-8. (doi:10.1038/ncomms8833).

Record type: Article

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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More information

Accepted/In Press date: 16 June 2015
Published date: 27 July 2015
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 396000
URI: http://eprints.soton.ac.uk/id/eprint/396000
PURE UUID: d1bacd5f-0694-4eb4-96ba-c9c01d7605e8

Catalogue record

Date deposited: 02 Jun 2016 09:44
Last modified: 18 Nov 2019 19:54

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