Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.52: Poster

Monday, March 23, 2009, 14:30–17:00, P2

Temperature dependance of lasing modes in ZnO nanorods — •Janos Sartor, Johannes Fallert, Victor Zalamai, Florian Maier-Flaig, Claus Klingshirn, and Heinz Kalt — Institut für Angewandte Physik, Universität Karlsruhe(TH), Germany

ZnO can be grown in the form of nanorods which form a natural cavity for nanoscaled lasers. In this work the temperature dependance of stimulated emission from nanorods under quasi-stationary excitation has been investigated. Collection by a microscope objective allows to analyze the photoluminescence from single nanorods. Stable multimode lasing can be observed after optical pumping of the ZnO nanorods. Though the lasing threshold increases with higher temperatures, the individual laser modes can be traced up to room temperature. A spectral red-shifting of the modes which is observed at higher temperatures is attributed to the narrowing of the bandgap with increasing temperature and an additional band gap renormalization due to high carrier concentrations.