Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 55: Quantum dots and wires: Preparation and characterization

HL 55.10: Talk

Friday, March 16, 2018, 12:00–12:15, A 151

Quantum dot-microlenses for single-photon sources operating at telecom wavelength — •Nicole Srocka¹, Pawel Mrowinski², Lukasz Duanowski², Anna Musial², Grzegorz Sek², David Quandt¹, Andrei Strittmatter^1,3, Sven Rodt¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universiät Berlin, D-10623 Berlin, Germany — ²Laboratory for Optical Spectroscopy of nanostructures, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland — ³Present address: Institute of Experimental Physics, Otto von Guericke University Magdeburg, D-39106 Magdeburg, Germany

Advanced quantum communication applications require single photon sources featuring i) high photon-extraction efficiency, ii) high flux rate, iii) high suppression of multi-photon emission and iv) high degree of photon indistinguishability. The concept of monolithic microlenses aligned to self-assembled semiconductor-quantum-dots has been proven to be an efficient approach to satisfy all of these four requirements in a single device operating at 900−950 nm [1]. We report on applying this approach to In(Ga)As/GaAs quantum dots emitting in the telecom O-band. We will sketch a full circuit from theory based design optimization to fabrication utilizing in situ three-dimensional electron-beam lithography and results of a final spectroscopic evaluation [2].
References:

[1] M. Gschrey, A.Thoma et al, Nat. Commun., 6, 7662 (2015).

[2] L. Dusanowski, et al, Opt. Express., 25(25), 31122-31129 (2017).