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Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses
Zitatschlüssel Schnauber2016
Autor P. Schnauber, A. Thoma, C. V. Heine, A. Schlehahn, L. Gantz, M. Gschrey, R. Schmidt, C. Hopfmann, B. Wohlfeil, J.-H. Schulze, S. Strittmatter, T. Heindel, S. Rodt, U. Woggon, D. Gershoni, and S. Reitzenstein
Seiten 1
Jahr 2016
ISSN 2227-7080
DOI 10.3390/technologies4010001
Journal Technologies
Jahrgang 4
Nummer 1
Zusammenfassung 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.
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