Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses
| Autor: | Peter Schnauber, Alexander Thoma, Christoph V. Heine, Alexander Schlehahn, Liron Gantz, Manuel Gschrey, Ronny Schmidt, Caspar Hopfmann, Benjamin Wohlfeil, Jan-Hindrick Schulze, André Strittmatter, Tobias Heindel, Sven Rodt, Ulrike Woggon, David Gershoni, Stephan Reitzenstein |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Technologies, Vol 4, Iss 1, p 1 (2015) |
| Druh dokumentu: | article |
| ISSN: | 2227-7080 95467831 |
| DOI: | 10.3390/technologies4010001 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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