Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Poster Session: Quantum Dots and Wires - Preparation and Characterization / Devices (incl. Laser) / Ultrafast Phenomena

HL 43.17: Poster

Dienstag, 27. März 2012, 09:30–12:30, Poster D

Electrical Contacting of Pyramidal Microcavities for Single- Photon Applications — •Daniel Rülke, Daniel M. Schaadt, Heinz Kalt, and Michael Hetterich — Institut für Angewandte Physik, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany

In order to fabricate electrically driven single-photon devices, we have established a manufacturing process for the contacting of single pyramidal microcavities. The cavities consist of reversed GaAs pyramids with InAs quantum dots (QDs) located close to their tip and have been fabricated by a combination of molecular-beam epitaxy, e-beam lithography and wet-chemical etching. These cavities reveal very good outcoupling efficiencies for the QD emission and guarantee low numbers of QDs in the cavity, due to their shape. Electrical contacts to individual cavities have been realized by free-standing GaAs and PMMA bridges.