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
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