Raman probing of competitive laser heating and local recrystallization effect in ZnO nanocrystals
Date
2012
Authors
Ye, J. D.
Parkinson, P.
Ren, F. F.
Gu, S. L.
Jagadish, C.
Tan, Hark Hoe
Journal Title
Journal ISSN
Volume Title
Publisher
Optical Society of America
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.
Description
Keywords
Keywords: Coupling strengths; Excitation conditions; Laser induced; Local heating; Longitudinal optical phonons; MgO; Photochemical effect; Resonance effect; Resonance Raman spectra; Structural modifications; ZnO nanocrystal; Laser excitation; Laser heating; Nanocr
Citation
Collections
Source
Optics Express
Type
Journal article