Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 42: Quantum dots and wires: Preparation and characterization
HL 42.8: Talk
Thursday, April 4, 2019, 17:00–17:15, H34
Quantum dot-microlenses and -mesas for single-photon sources operating at telecom wavelength — •Nicole Srocka1, Jan Große1, Pawel Mrowinski1,2, Anna Musial2, David Quandt1, André Strittmatter1,3, Grzegorz Sek2, Sven Rodt1, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universiẗat 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 and -mesas 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].
[1] M. Gschrey, A.Thoma et al, Nat. Commun., 6, 7662 (2015).
[2] N. Srocka, et al, AIP Adv., 8, 085205 (2018).