Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Quantum wires: Optical properties (with TT)

HL 52.2: Talk

Tuesday, April 1, 2014, 14:45–15:00, POT 112

Phonon-assisted lasing in ZnO microwires — •Stefan Lange, Tom Michalsky, Christof P. Dietrich, Helena Franke, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig

In this work we present the investigation of the lasing properties of ZnO microwires. The spectral distribution of the lasing modes reveals a strong exciton-phonon interaction as the main lasing mechanism. These findings are supported by former results measuring a strong exciton-phonon interaction in ZnO [1,2] and showing indications for an increase of the coupling strength with reduced structure size [2]. Photoluminescence and coherence measurements under varying excitation density prove the transition from spontaneous to stimulated emission.

[1] D.C. Reynolds et al., J. Appl. Phys. 89, 6189 (2001)

[2] H.C. Hsu et al., J. Crystal Growth 261, 520 (2004)