Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 33: Quantum Dots: Optical Properties I
HL 33.8: Vortrag
Dienstag, 21. März 2017, 12:00–12:15, POT 81
Deterministically fabricated bright single-photon sources with a backside gold mirror — •Sarah Fischbach1, Alexander Thoma1, Esra Burcu Yarar Tauscher1, Ronny Schmidt1, Arsenty Kaganskiy1, Fabian Gericke1, André Strittmatter1,2, Tobias Heindel1, Sven Rodt1, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Germany — 2Institut für Experimentelle Physik, Otto-von-Guericke-Universität Magdeburg, Germany
Combinations of quantum dots (QDs) and deterministically fabricated microlenses can act as efficient single-photon sources with low g(2)(0)-values and a high photon indistinguishability. Applications in the field of advanced quantum communications, however, require in addition high extraction efficiencies as well as a flexible technology platform, which can be extended for strain tuning or electrical contacts.
Here, we realize a deterministic single-photon source based on a QD microlens with a backside gold mirror, providing high reflectivity even at large angles of incidence. The utilized flip-chip process with thermo-compression gold bonding was realized with a distance of 60 nm between mirror and QD to achieve a maximum enhancement of the emission.
The geometry of the structures is optimized using finite-element simulations. Suitable target QDs are selected by cathodoluminscence lithography at cryogenic temperatures and are integrated into devices by 3D in-situ electron-beam lithography. Photoluminescence measurements demonstrate high extraction efficiencies as well as a second order autocorrelation value g(2)(0) < 0.02.