Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Quantum Dots and Wires: Single Photon Sources
HL 5.7: Vortrag
Montag, 7. März 2016, 11:45–12:00, H15
Efficient single-photon sources based on deterministic quantum-dot microlenses with backside gold mirrors — •Sarah Fischbach1, Esra Yarar Tauscher1, Peter Schauber1, Ronny Schmidt1, Jan-Hindrik Schulze1, Alexander Thoma1, Alexander Schlehahn1, Benjamin Wohlfeil2, Sven Burger2, André Strittmatter3, Tobias Heindel1, Sven Rodt1, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Germany — 2Zuse-Institut Berlin (ZIB), Germany — 3Institut für Experimentelle Physik, Otto-von-Guericke-Universität Magdeburg, Germany
By utilizing single semiconductor quantum dots (QDs) advances in creating single-photon sources (SPSs) have been made, enabling close to ideal single-photon emission in terms of g(2)(0) as well as the photon-indistinguishability. Applications in the field of quantum communications, however, require highest photon extraction efficiencies at precisely defined emission wavelengths at the same time.
Here, we report on a novel approach to realize high fidelity SPSs by combining a single QD, deterministically integrated within a monolithic microlens, with a backside gold mirror. FEM-simulations are carried out to determine the optimum device geometry. The mirror is realized via a flip-chip process with thermo-compression gold bonding, while microlenses are patterned by in situ three-dimensional electron-beam lithography at cryogenic temperatures. In that way, bright QDs with preselected spectral features can be chosen to optimize their photon extraction efficiency.