Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Quantum light sources

HL 33.3: Vortrag

Mittwoch, 3. April 2019, 15:30–15:45, H34

Characterization of deterministically fabricated quantum dot microlenses under mechanical strain tuning — •Marco Schmidt^1,2, Sarah Fischbach¹, Martin von Helversen¹, Arsenty Kaganskiy¹, Sven Rodt¹, Tobias Heindel¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — ²Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany

Quantum dots (QPs) are sources of single, indistinguishable photons as well as polarization entangled photon pairs. These highly efficient QP emitters are of highest interest for future quantum communication systems allowing for the interception-proof exchange of information by single photons. The spectral properties of QPs determined by the self-assembled growth and can be manipulated in limited range by experimental methods, e.g. temperature variation. The emission energy can also be tuned more elegantly to a target wavelength by applying external mechanical strain, while maintaining the good optical quality. We demonstrate a tunable single-photon source based on a deterministically fabricated QD microlens which is positioned on top of a piezoactuator by a flip-chip goldbonding technique. A control loop is implemented which stabilizes the strain and the emission wavelength of the QD. Characterizations of the system in terms of stability, modulation ranges, transfer functions and spectroscopic investigations will be presented.