標題: | Coherent acoustic phonon oscillation accompanied with backward acoustic pulse below exciton resonance in a ZnO epifilm on oxide-buffered Si(111) |
作者: | Lin, Ja-Hon Shen, Yu-Kai Liu, Wei-Rein Lu, Chia-Hui Chen, Yao-Hui Chang, Chun-peng Lee, Wei-Chin Hong, Minghwei Kwo, Jueinai-Raynien Hsu, Chia-Hung Hsieh, Wen-Feng 光電工程學系 Department of Photonics |
關鍵字: | coherent acoustic phonon;pump probe technique;ZnO;exciton resonance |
公開日期: | 17-八月-2016 |
摘要: | Unlike coherent acoustic phonons (CAPs) generated from heat induced thermal stress by the coated Au film, we demonstrated the oscillation from c-ZnO epitaxial film on oxide buffered Si through a degenerate pump-probe technique. As the excited photon energy was set below the exciton resonance, the electronic stress that resulted from defect resonance was used to induce acoustic wave. The damped oscillation revealed a superposition of a high frequency and long decay CAP signal with a backward propagating acoustic pulse which was generated by the absorption of the penetrated pump beam at the Si surface and selected by the ZnO layer as the acoustic resonator. |
URI: | http://dx.doi.org/10.1088/0022-3727/49/32/325102 http://hdl.handle.net/11536/134275 |
ISSN: | 0022-3727 |
DOI: | 10.1088/0022-3727/49/32/325102 |
期刊: | JOURNAL OF PHYSICS D-APPLIED PHYSICS |
Volume: | 49 |
Issue: | 32 |
顯示於類別: | 期刊論文 |