Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 4: Quantum dots and wires: Optical properties I

HL 4.6: Talk

Monday, March 12, 2018, 10:45–11:00, EW 201

High-Q micropillars with a controlled number of deterministically grown quantum dots — •Arsenty Kaganskiy, Fabian Gericke, Tobias Heuser, Tobias Heindel, Xavier Porte, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623

We report on the realization of micropillars with site-controlled quantum dots (SCQDs) in the active layer. The SCQDs are grown via the buried stressor approach which allows for the positioned growth and device integration of a countable number of QDs with high optical quality. This concept is very powerful as the number and the position of SCQDs in the cavity can be simultaneously controlled by the design of the buried stressor. The fabricated micropillars exhibit high position control of the QD growth combined with Q-factors of up to 12000. The cavity Q-factor, Purcell factor and photon-extraction effciency are analyzed as a function of the aperture diameter demonstrating an additional oxid-aperture-induced mode confinement in the microcavity. Single-QD Purcell enhancement of the emission is investigated via temperature-induced resonance-tuning resulting in a Purcell factor of 4.3 ± 0.3. [1]

[1] A. Kaganskiy et al., arXiv:1711.09235 (2017)