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Main Title: Bright single-photon sources based on anti-reflection coated deterministic quantum dot microlenses
Author(s): Schnauber, Peter
Thoma, Alexander
Heine, Christoph V.
Schlehahn, Alexander
Gantz, Liron
Gschrey, Manuel
Schmidt, Ronny
Hopfmann, Caspar
Wohlfeil, Benjamin
Schulze, Jan-Hindrick
Strittmatter, André
Heindel, Tobias
Rodt, Sven
Woggon, Ulrike
Gershoni, David
Reitzenstein, Stephan
Type: Article
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.
Subject(s): quantum dots
deterministic devices
quantum optics
single-photon source
anti-reflection coating
extraction efficiency
Issue Date: 25-Dec-2015
Date Available: 13-Jan-2021
Language Code: en
DDC Class: 600 Technik, Technologie
Sponsor/Funder: BMBF, 03V0630, Entwicklung einer Halbleiterbasierten Einzelphotonenquelle für die Quanteninformationstechnologie
Journal Title: Technologies
Publisher: MDPI
Volume: 4
Issue: 1
Article Number: 1
Publisher DOI: 10.3390/technologies4010001
EISSN: 2227-7080
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Festkörperphysik » AG Optoelektronik und Quantenbauelemente
Appears in Collections:Technische Universität Berlin » Publications

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