Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 24: Photonic crystals II
HL 24.2: Vortrag
Dienstag, 26. Februar 2008, 09:45–10:00, EW 202
Coupled Bragg Pillar Cavities with Localized and Delocalized Mode Structure — •Matthias Karl1, Shunfeng Li1, Erich Müller2, 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
In the context of a further application in quantum information processing we are investigating the optical coupling of spatially separated quantum dots (QDs) via optical microcavity modes. For this purpose we study pillar cavities with top and bottom GaAs/AlAs Bragg mirrors. InAs QDs are embedded in the middle of the lambda-thick cavity emitting at around 950 nm. Out of this molecular-beam epitaxially grown layer structure single and connected pillars are milled by means of a focused-ion beam. A micro-photoluminescence set-up with an additional spatial resolution allows to measure the intensity distribution for different modes. Depending geometrically on the diameters of the pillars and the coupling bridge between two of them it is possible to design connected pillars with the coexistence of localized and delocalized cavity modes. The design of such cavity structures is devised using a step-index fiber simulation based on the finite-element method. Experimental results confirm these predicted cavity mode structures.