Chapter 7: Conclusion
7.2 Prospective
For the purpose of more complete femtosecond time-resolvd equipment, the non-degenerate optical pump-probe system can be achieved by using the mode-locked Ti:sapphire laser and photonic crystal fiber (PCF) to generate the super continuum probe beam for transient absorption spectroscopy. Not only the transient absorption measurement, the setup femtosecond resolved TRPL system, such as the up-conversion method as shown in Fig. 7-1 [68], will be useful to study the optical gain and lasing dynamics in ZnO-related materials.
THG Kit
Fig. 7-1. The setup of Up-conversion method for femtosecond resolved TRPL system.
Our groups have found that the strength of exciton and LO-phonon coupling can be reduced in ZnO quantum dots as shown in Fig. 7-2 [69]. In addition, the excitons in ZnO/ZnMgO QWs exhibit strong stability as compared to bulk material due to the enhancement of exciton binding energy and the reduction of exciton-phonon coupling when the scale of ZnO-related nanostructures is close to exciton Bohr radius.
Therefore, it is interesting to observe the quantum confinement effect by investigating the ultrafast carrier dynamics in ZnO/ZnMgO MQWs with well-width or
barrier-width dependence.
3.0 3.2 3.4 3.6
5.3 nm 7.4 nm 12 nm
Intensity (a.u.)
LO-phonon FX replicas
D0X
Powder
Photon Energy (eV)
Fig. 7-2. Low temperature PL spectra at 13K in size controlled ZnO quantum dots.
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個人簡歷 基本資料:
姓名: 歐博濟 (Po-Chi Ou) 性別: 男
出生年月日: 1979 年 11 月 23 日 出生地: 高雄市
通訊處: 高雄市左營區左營大路 301 巷 12 號 Email: [email protected]
學經歷:
國立高雄師範大學物理學系 學士 (1998/09 ~ 2002/06) 高雄市立三民國中 實習教師 (2002/07 ~ 2003/06)
國立中央大學光電科學研究所 碩士 (2003/09 ~ 2005/06)
國立交通大學光電工程研究所 博士 (2005/09 ~ 2011/09)
Publication list
Journal publications
1. Po-Chi Ou, Ja-Hon Lin, Chi-An Chang, Wei-Rein Liu and Wen-Feng Hsieh,
“Thickness effect on ultrafast thermalization of carriers in above-band-gap states in ZnO epitaxial films”, J. Phys. D: Appl. Phys. 43, 495103 (2010).
2. Po-Chi Ou, Wei-Rein Liu, Ho-Jei Ton, Ja-Hon Lin and Wen-Feng Hsieh,
“Ultrafast relaxation and absorption saturation at near exciton resonance in a thin ZnO epilayer”, J. Appl. Phys. 109, 013102 (2011).
3. Po-Chi Ou, Ja-Hon Lin and Wen-Feng Hsieh, “Spectral dependence of transient reflectance in a ZnO epitaxial film at room temperature”, Accepted for publication in Appl. Phys. B - Lasers and Optics, (2011/07/25).
International conferences
1. Po-Chi Ou, Ja-Hon Lin, Chi-An Chang, Wei-Rein Liu and Wen-Feng Hsieh,
“Carrier dynamics of thin ZnO epifilm above band-gap states”, Poster at 8th Pacific Rim Conference on Lasers and Electro-Optics, (2009/08).
2. Po-Chi Ou, Ja-Hon Lin, Chin-Chia Kuo and Wen-Feng Hsieh, “Optical nonlinear absorption of ZnO/ZnMgO multiple quantum wells at room temperature”, Poster at IQEC/CLEO Pacific Rim 2011, NO. 3700-PO-109.