Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 49: Quantum Dots: Optical Properties III

HL 49.2: Talk

Wednesday, March 22, 2017, 09:45–10:00, POT 151

Optical enhancement of quantum dot emission by surface nanowires — •Sven Scholz, Rüdiger Schott, Carlo Sgroi, Yannick Raffel, Andreas D. Wieck, and Arne Ludwig — Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany

Molecular beam epitaxy (MBE) quantum dot (QD) structures are used as fundamental research structures to investigate quantum optical phenomena. To further enhance their optical properties we use nanowires as a subwavelength waveguide. While common photonic crystal structures work with holes or micro pillars, we use focused ion beam (FIB) to catalyze nanowire growth on QD structures. The LED-QD structure is optimized regarding the optical emission. Therefore we use a methode to remove the wetting layers (WL) PL signal. To access a wide emission spectrum we use rapid-thermal annealing (RTA) and a flushing technique coupled with the WL suppression. This results in tunable and good separated QD emission peaks. The NW growth is characterized and optimized with regards to crystalline quality and morphology. The samples are characterized by photoluminescence/electroluminescence, scanning electron microscope imaging and capacitance-voltage spectroscopy.