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Raman probing of competitive laser heating and local recrystallization effect in ZnO nanocrystals |
Optics Express, Vol. 20, Issue 21, pp. 23281-23289 (2012)
http://dx.doi.org/10.1364/OE.20.023281
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Abstract
The competitive laser-induced local heating and recrystallization effects in ZnO nanocrystals embedded in a MgO/ZnO stack are reported via resonance Raman spectra. The dependence of the intensity, energy, and resonance effects of the longitudinal optical (LO) phonon on laser excitation condition are discussed in the context of Fröhlich interaction. Redistribution of defects, impurity-diffusion, and grain regrowth caused by thermal and photochemical effects lead to significant changes in coupling strength of electron-phonon interaction, and the resonance behaviors are strongly affected by the interplay of local heating, heat trapping, and local structural modification in such nanostructures.
© 2012 OSA
OCIS Codes
(140.3550) Lasers and laser optics : Lasers, Raman
(160.4760) Materials : Optical properties
(160.6000) Materials : Semiconductor materials
(160.4236) Materials : Nanomaterials
ToC Category:
Materials
History
Original Manuscript: May 18, 2012
Revised Manuscript: July 27, 2012
Manuscript Accepted: September 12, 2012
Published: September 25, 2012
Citation
J. D. Ye, P. Parkinson, F.F. Ren, S. L. Gu, H.H. Tan, and C. Jagadish, "Raman probing of competitive laser heating and local recrystallization effect in ZnO nanocrystals," Opt. Express 20, 23281-23289 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-21-23281
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