Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 46: Poster 2
HL 46.70: Poster
Donnerstag, 29. März 2007, 15:00–17:30, Poster A
Optical Modes in Pyramidal Microcavities — •Frank M. Weber1, Matthias Karl1, Jaime Lupaca-Schomber1, Wolfgang Löffler1, Shunfeng Li1, Thorsten Passow1, Jacques Hawecker2, Dagmar Gerthsen2, Heinz Kalt1, and Michael Hetterich1 — 1Universität Karlsruhe (TH) and Center for Functional Nanostructures (CFN), 76128 Karlsruhe, Germany — 2Laboratorium für Elektronenmikroskopie and CFN, Universität Karlsruhe (TH), 76128 Karlsruhe, Germany
We investigate the application of pyramidal GaAs structures on GaAs/AlAs distributed Bragg reflectors as optical resonators. The structures are fabricated using electron beam lithography and a wet chemical etching technique. In contrast to self-assembled growth this allows us to engineer the exact geometry of the microcavities. InGaAs quantum dots (QDs) inside the cavity couple to the resonator and the luminescence spectrum of the QD ensemble around 950 nm shows clear peaks. These correspond to optical modes in the pyramid which is confirmed by temperature-dependent measurements. We further investigate and simulate the dependence of the modal density on pyramid size. Complex structures such as pyramids with interconnects which could serve as coupled resonators were also manufactured.