Ultrafast carrier dynamics and coherent acoustic phonons in bulk CdSe

被引：16
|
作者：
Wu, Wenzhi [1 ,2 ]
Wang, Yaguo [1 ]
机构：
[1] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
[2] Heilongjiang Univ, Sch Elect Engn, Harbin 150080, Peoples R China
来源：
OPTICS LETTERS | 2015年 / 40卷 / 01期
基金：
美国国家科学基金会;
关键词：
NONLINEARITIES; NANOCRYSTALS; GENERATION;
D O I：
10.1364/OL.40.000064
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The femtosecond pump-probe technique is used to study the dynamics of photoexcited carriers and coherent acoustic phonons in bulk CdSe semiconductor. A turning point from fast to slow decay is observed, whose amplitude decreases with pump fluences and eventually flips the sign of differential reflectivity. The maximum change of differential reflectivity shows a saturation at high pump fluences, which is attributed to the optical energy gap dependent on carrier density. Long-lasting coherent oscillations of acoustic phonons have also been detected, and their amplitude and lifetime have a strong dependence on pump fluences. Our results can facilitate the understanding of ultrafast carrier and phonon dynamics in CdSe nanocrystals. (C) 2014 Optical Society of America
引用
收藏
页码：64 / 67
页数：4
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