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Proceedings Paper

Lasing and laser-induced motion of zinc oxide nano-crystals irradiated by ultraviolet laser beam
Author(s): K. Okazaki; D. Nakamura; M. Higashihata; T. Okada
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Paper Abstract

The lasing characteristics and the alignment methods of ZnO nanocrystals were investigated for an application to ultraviolet (UV) laser diode (LD). ZnO nanowires and nanosheets were synthesized on a silicon substrate by a CVD method or nanoparticle assisted pulsed-laser deposition (NAPLD), and then those ZnO nanocrystals were examined by a photoluminescence (PL) method with a third-harmonic Nd:YAG laser (355 nm, 5 ns). The observed emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The threshold power density of a ZnO nanowire and a nanosheet were measured to be 100 kW/cm2 and 5 kW/cm2, respectively. Furthermore, the threshold power was calculated to be 8.4 mW for a ZnO nanowire and 2.5 mW for a ZnO nanosheet. Then the oscillation mechanisms were discussed on those ZnO nanocrystals. We also observed the laser-induced motion (LIM) of ZnO nanocrystals when they were excited by ultraviolet laser beam.

Paper Details

Date Published: 21 February 2011
PDF: 10 pages
Proc. SPIE 7922, Synthesis and Photonics of Nanoscale Materials VIII, 79220M (21 February 2011); doi: 10.1117/12.875793
Show Author Affiliations
K. Okazaki, Kyushu Univ. (Japan)
D. Nakamura, Kyushu Univ. (Japan)
M. Higashihata, Kyushu Univ. (Japan)
T. Okada, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 7922:
Synthesis and Photonics of Nanoscale Materials VIII
David B. Geohegan; Jan J. Dubowski; Frank Träger, Editor(s)

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