標題: Spectral dependence of transient reflectance in a ZnO epitaxial film at room temperature
作者: Ou, P-C
Lin, J-H
Hsieh, W-F
光電工程學系
Department of Photonics
公開日期: 1-二月-2012
摘要: We demonstrated the spectral dependence of time-resolved reflectance in a ZnO epitaxial film at room temperature. The ultrafast thermalization time increases as increasing the excitation photon energy accompanied with the hot phonon effect. The obtained recovery time of renormalized bandgap, associated with the nonradiative decay or the free exciton formation, is independent of photon energy. Based on a theoretical model to calculate the carrier-induced change of refractive index in ZnO, the spectral dependent transient reflectance can be successfully analyzed as a result of combined effects of band-filling (BF) and bandgap renormalization (BGR). The measured transient reflectance decreases with decreasing the photon energy for excitation above the bandgap states revealing the significance of competition of the BF and BGR effects.
URI: http://dx.doi.org/10.1007/s00340-011-4706-x
http://hdl.handle.net/11536/15228
ISSN: 0946-2171
DOI: 10.1007/s00340-011-4706-x
期刊: APPLIED PHYSICS B-LASERS AND OPTICS
Volume: 106
Issue: 2
起始頁: 399
結束頁: 404
顯示於類別:期刊論文


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  1. 000299749700022.pdf