Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 50: Poster II
HL 50.65: Poster
Donnerstag, 30. März 2006, 16:30–19:00, P3
CYLINDRIC RESONATORS WITH COAXIAL BRAGG-REFLECTORS — •R. Schmidt-Grund1, T. Gühne2, H. Hochmut1, B. Rheinländer1, A. Rahm1, V. Gottschalch2, J. Lenzner1, and M. Grundmann1 — 1Uni Leipzig, Inst. für Exp. Physik II — 2Uni Leipzig, Fak. für Chemie und Mineralogie
Lateral confinement for cylindrical micro-resonator light emitters improves the ratio of the number of the axial resonant modes to the number of the spontaneous emitting lateral modes. We have observed resonator behaviour of cylindrical micro-structures, whose surfaces were coated with coaxial MgO/ZrO2 and a-Si/SiOx Bragg-reflectors (BR).
Glass rods with circularly shaped basal planes (⊘=5µ…100µm) and ZnO wires with hexagonally shaped basal planes (⊘=0.8µm…10µm) were used as cavity material. The optical properties were investigated using a micro-reflectometer (µR), spatially resolved spectroscopic ellipsometry, and cathodoluminescence (CL) measurements. The Bragg-stop-band (SB) of the BR deposited on the free standing ZnO-wires was found to be uniform for all hexagonal lateral facets. In contrast, the SB of the BR deposited on the horizontally mounted glass rods varies with the azimuthal position on surface. The µR measurements were performed perpendicular to the axis of the ZnO wires. In the wavelength range of the SB spectral structures due to multiple-reflection induced interferences of the ZnO cavity are visible. This indicates resonator behaviour of the coated ZnO-wires. CL measurements confirm these results.
Calculations of the electromagnetic field distribution within the cylindrically layered structures will be presented.