Observation of coherent acoustic phonon in titanyl phthalocyanine thin solid films

被引：1
|
作者：
Ahn, Hyeyoung [1 ]
Su, Shiu-Ho [1 ]
机构：
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan
来源：
APPLIED PHYSICS EXPRESS | 2015年 / 8卷 / 08期
关键词：
EXCITED-STATE DYNAMICS; MOLECULAR ARRANGEMENTS; GENERATION; ULTRAFAST; TITANYLPHTHALOCYANINE; RELAXATION;
D O I：
10.7567/APEX.8.082401
中图分类号：
O59 [应用物理学];
学科分类号：
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
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页数：4
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