Lasing in single ZnO nanorods after fs- and ns-pulsed excitation

In this work we examine the lasing properties of single ZnO nanorods under ns- and fs-pulsed excitation. By measuring the photoluminescence of individual nanorods excited by a single ns-pulse we demonstrate that several stable lasing modes are emitted by the nanorod. In this quasi-stationary excitation regime lasing up to room temperature can be achieved. Measurements of the temperature dependent laser threshold and of the spectral lasing region are presented. The excitation with fs-pulsed excitation combined with a time resolved photoluminescence measurement gives furthermore an insight in the lasing dynamics. [GRAPHICS] Scanning electron microscope picture of a sample with an array of ZnO nanorods grown perpendicular aligned on the substrate. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim