Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.3: Poster

Dienstag, 13. März 2018, 18:30–20:30, Poster F

Optical enhancement of quantum dot emission by nanowires — •Sven Scholz, Rüdiger Schott, Marcel Schmidt, Arne Ludwig, and Andreas D. Wieck — Ruhr-Universität Bochum, Universitätsstr. 150, D-44801 Bochum

Molecular beam epitaxy (MBE) quantum dot (QD) structures are used as fundamental research structures. 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. An LED-NW-QD structure is optimized regarding the optical emission. Therefore we use an AlAs layer 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 and scanning electron microscope imaging.