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Technique for synthesis of the ZnO nanowires by Nanoparticle-Assisted Pulsed-Laser Deposition (NAPLD) and the characterization of their optical property are described. Vertically-aligned ZnO nanowires were successfully grown on sapphire substrates by NAPLD without any catalyst. The surface density of the nanowires on the substrate was controlled by changing the laser irradiation conditions, such as an energy and a repetition rate. When a nanowire was excited by the third harmonic of a Q-switched Nd:YAG laser, the stimulated emission due to a micro-cavity effect in single nanowire was observed with a lasing threshold of about 400 kW/cm2, indicating high crystalinity of ZnO nanowires.

Synthesis of ZnO Nanowires by Nanoparticle-Assisted Pulsed-Laser Deposition and Optical Characteristics of Single ZnO Nanowire