Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.38: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Tunable lasing from hexagonal ZnO micro wires at room temperature — Tom Michalsky, •Marcel Wille, Evgeny Krüger, Helena Franke, Marius Grundmann, and Rüdiger Schmidt-Grund — Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany

We demonstrate a hexagonal ZnO micro wire resonator (MW) whose emission wavelength can be finely tuned. Furthermore one can switch between single- or dual mode operation. For that we use a slightly tapered MW with a diameter range (∼resonator length) that allows only one or two whispering gallery modes (WGMs) to be amplified by gain from an electron-hole plasma. The emission wavelength as well as single- or dual mode operation can be set by choosing the matching wire diameter and thus resonator length by slightly changing the position of the excitation spot on the wire in micro photoluminescence experiments. It turnes out that the modes in lasing operation are purely TE polarized. We also present an approach to increase the WGMs’ quality factor (∼lifetime) by a factor of five by sandwiching the hexagonal wire resonator between two planar distributed Bragg reflectors.