Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses
AbstractWe 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
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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.
Schnauber P, Thoma A, Heine CV, 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):1.Chicago/Turabian Style
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. 2016. "Bright Single-Photon Sources Based on Anti-Reflection Coated Deterministic Quantum Dot Microlenses." Technologies 4, no. 1: 1.
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