標題: | Observation of coherent acoustic phonon in titanyl phthalocyanine thin solid films |
作者: | Ahn, Hyeyoung Su, Shiu-Ho 光電工程學系 Department of Photonics |
公開日期: | 1-Aug-2015 |
摘要: | Ultrafast exciton dynamics is investigated in titanyl phthalocyanine (TiOPc) micrograin films in this study. Exponential exciton relaxation and oscillatory responses are observed in transient reflectivity measurements of the films. Laser-induced coherent acoustic waves (LCAW) are proposed to be responsible for this oscillation. Despite their fast attenuation with the increase in temperature, LCAWs are successfully detected at room temperature through probing at a large oblique angle near the low-energy absorption edge of the Q-Band. From the oscillation period of the LCAW, the sound velocity is estimated to be similar to 3.1 x 10(3) m/s, and an acoustic echo arising from the boundary between the films and substrate is also observed. (C) 2015 The Japan Society of Applied Physics |
URI: | http://dx.doi.org/10.7567/APEX.8.082401 http://hdl.handle.net/11536/128170 |
ISSN: | 1882-0778 |
DOI: | 10.7567/APEX.8.082401 |
期刊: | APPLIED PHYSICS EXPRESS |
Appears in Collections: | Articles |