Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Photonic crystals I
HL 18.8: Talk
Tuesday, March 27, 2007, 12:30–12:45, H13
GaAs pyramids as alternative micro-cavities — •Matthias Karl1, Frank M. Weber1, Jaime Lupaca-Schomber1, Wolfgang Löffler1, Shunfeng Li1, Thorsten Passow1, Jacques Hawecker2, 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
Pyramidal resonators are promising optical micro-cavities since they have great potential as small-mode volume resonators to enhance light-matter interaction.
Our resonators are fabricated from a molecular-beam epitaxy-grown layer structure containing an AlAs/GaAs distributed Bragg reflector as the bottom mirror. The pyramidal resonators on top are achieved by a combination of electron-beam lithography and wet chemical etching utilizing an AlAs sacrificial layer. The pyramids contain In(Ga)As quantum dots which – excited by a 532 nm cw laser – serve as a broad-band light source in the spectral range from 900 nm to 1000 nm. Optical cavity modes in these pyramids are identified and investigated using temperature-dependent measurements in a confocal micro-photoluminescence set-up.