Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: ZnO: Optical properties

HL 49.6: Vortrag

Donnerstag, 28. Februar 2008, 12:00–12:15, ER 164

Gain and dynamics in ZnO nanorod lasers — •Johannes Fallert¹, Roman J. B. Dietz¹, Felix Stelzl¹, Huijuan Zhou¹, Janos Sartor¹, Anton Reiser², Klaus Thonke², Rolf Sauer², Claus Klingshirn¹, and Heinz Kalt¹ — ¹Institut für Angewandte Physik, Universität Karlsruhe (TH), Germany — ²Institut für Halbleiterphysik, Universität Ulm, Germany

Recent progress in reliable p-doping of ZnO and the realization of ZnO based LEDs foster the hope to achieve ZnO-based short-wavelength laser diodes. In particular, ZnO nanorods which can be grown in ordered, extended arrays offer the possibility to realize nano-scaled lasers. There, ZnO is not only the gain medium, but also acts as a laser resonator. Under lasing conditions the emission wavelength is defined by the guided modes in the nanorod. Here we study the lasing dynamics of individual nanorods by time-resolved µ-photoluminescence. We demonstrate that these modes show gain competition and pronounced shifts with varied pump intensity as well as within their temporal evolution. We find that even at low temperature the gain is exclusively due to an electron-hole plasma. Furthermore the influence of temperature on the available gain is examined and room-temperature lasing is achieved under ns-excitation.