Title: Coherent acoustic phonon oscillation accompanied with backward acoustic pulse below exciton resonance in a ZnO epifilm on oxide-buffered Si(111)
Authors: 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
Department of Photonics
Keywords: coherent acoustic phonon;pump probe technique;ZnO;exciton resonance
Issue Date: 17-Aug-2016
Abstract: 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
ISSN: 0022-3727
DOI: 10.1088/0022-3727/49/32/325102
Volume: 49
Issue: 32
Appears in Collections:Articles