Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 46: Poster 2
HL 46.71: Poster
Donnerstag, 29. März 2007, 15:00–17:30, Poster A
Coupled micro-cavities based on GaAs pillars — •Matthias Karl1, Wolfgang Löffler1, Shunfeng Li1, Thorsten Passow1, Erich Müller2, Fabián Pérez-Willard2, Dagmar Gerthsen2, Heinz Kalt1, and Michael Hetterich1 — 1Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76128 Karlsruhe, Germany — 2Laboratorium für Elektronenmikroskopie and CFN, Universität Karlsruhe (TH), 76128 Karlsruhe, Germany
Pillar-type micro-cavities are studied in our contribution. The pillars are milled with a focused ion beam out of a layer structure with top and bottom AlAs/GaAs distributed Bragg reflectors grown by molecular-beam epitaxy. In(Ga)As quantum dots emitting at around 950 nm are embedded in the middle of the GaAs-based λ-cavity. Optical modes in these pillars are detected by a micro-photoluminescence set-up.
Treating the pillar as a short step-index fiber we are able to model the experimental results with a finite-element method. This allows us to predict the resonances for different pillar diameters as well as for coupled pillar structures. Asymmetric coupled resonators designed by our calculations are investigated experimentally achieving optical modes either localized in one of the pillars or delocalized over the whole structure.