Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 86: Poster: Secure Communication & Computation
FM 86.7: Poster
Thursday, September 26, 2019, 16:30–18:30, Tents
Towards efficient single-photon sources at telecom wavelengths — •J. Jasiński1, N. Srocka2, W. Rudno-Rudziński1, P.-I. Schneider3, S. Burger3,4, D. Quandt2, A. Strittmatter2, S. Rodt2, A. Musiał1, S. Reitzenstein2, and G. Sek1 — 1Wrocław University of Science and Technology, Poland — 2Technical University of Berlin, Germany — 3JCMwave, Berlin, Germany — 4Zuse Institute Berlin, Germany
Extraction efficiency is the main limiting factor in applications (e.g. QKD) of single-photon sources at telecom wavelengths required for integration with existing fiber networks. Epitaxial quantum dots (QDs) embedded in the solid-state matrix are very attractive in view of their integration, scalability and compatibility with current semiconductor technology. Here we present epitaxial In0.75Ga0.25As/GaAs QDs grown on a DBR and capped with strain reducing layer. QDs were deterministically embedded into cylindrical photonic mesa structures using in-situ electron beam lithography. The extraction efficiency has been determined based on single QD emission spectrum measured at saturation in a calibrated setup under non-resonant pulsed excitation using single photon counting modules. Values exceeding 10% have been achieved, but theoretical calculations show possibility of reaching 40% following optimized mesa geometry design.
We acknowledge financial support via the QuanTel project carried out within the HOMING programme of the Foundation for Polish Science co-financed by the EU under the European Regional Development Fund and by the Polish National Agency for Academic Exchange.