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Technologies 2016, 4(1), 1; doi:10.3390/technologies4010001

Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses

1
Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
2
The Physics Department, Technion—Israel Institute of Technology, Haifa 32000, Israel
3
Zuse-Institut Berlin (ZIB), Takustraße 7, 14195 Berlin, Germany
4
Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander V. Sergienko
Received: 18 November 2015 / Revised: 18 December 2015 / Accepted: 22 December 2015 / Published: 25 December 2015
(This article belongs to the Special Issue Quantum Metrology)
View Full-Text   |   Download PDF [1732 KB, uploaded 25 December 2015]   |  

Abstract

We report on enhancing the photon-extraction efficiency (PEE) of deterministic quantum dot (QD) microlenses via anti-reflection (AR) coating. The AR-coating deposited on top of the curved microlens surface is composed of a thin layer of Ta2O5, and is found to effectively reduce back-reflection of light at the semiconductor-vacuum interface. A statistical analysis of spectroscopic data reveals, that the AR-coating improves the light out-coupling of respective microlenses by a factor of 1.57 ± 0.71, in quantitative agreement with numerical calculations. Taking the enhancement factor into account, we predict improved out-coupling of light with a PEE of up to 50%. The quantum nature of emission from QDs integrated into AR-coated microlenses is demonstrated via photon auto-correlation measurements revealing strong suppression of two-photon emission events with g(2)(0) = 0.05 ± 0.02. As such, these bright non-classical light sources are highly attractive with respect to applications in the field of quantum cryptography. View Full-Text
Keywords: quantum dots; deterministic devices; quantum optics; single-photon source; anti-reflection coating; extraction efficiency quantum dots; deterministic devices; quantum optics; single-photon source; anti-reflection coating; extraction efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Schnauber, P.; Thoma, A.; Heine, C.V.; Schlehahn, A.; Gantz, L.; Gschrey, M.; Schmidt, R.; Hopfmann, C.; Wohlfeil, B.; Schulze, J.-H.; Strittmatter, A.; Heindel, T.; Rodt, S.; Woggon, U.; Gershoni, D.; Reitzenstein, S. Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses. Technologies 2016, 4, 1.

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