物理学报2012，Vol.61Issue(9)：414-418,5.
Fe/Si薄膜中相干声学声子的光激发研究
Photoinduced coherent acoustic-phonons in Fe/Si film
摘要
Abstract
High frequency coherent acoustic-phonons are excited in Fe/Si film by using femtosecond pump-probe technique. The dynamics of coherent acoustic-phonons can be fitted well to a classical damped harmonic function. The frequency and the dephasing time of the observed acoustic-phonons are 0.25 THz and 12 ps, respectively, which are independent of pumping photo-energy and fluence. Moreover, the amplitude of the coherent acoustic-phonons is linearly proportional to the fluence. The critical parameter （12Te-ph/T） is calculated to be about 0.6, which indicates that the electron pressure might play a significant role in driving coherent acoustic phonons. The thickness and the mass density of the film are required to determine the out-of-plane elastic constant C⊥ 283 GPa of the Fe/Si film.关键词
相干声学声子/飞秒抽运-探测技术/Fe/Si薄膜/弹性常数Key words
coherent acoustic phonon/femtosecond pump-probe technique/Fe/Si film/elastic constants分类
数理科学引用本文复制引用
张郑兵,马小柏,金钻明,马国宏,杨金波..Fe/Si薄膜中相干声学声子的光激发研究[J].物理学报,2012,61(9):414-418,5.基金项目
国家自然科学基金（批准号：11174195,50701003）,上海市科学技术委员会基础研究计划（批准号：09530501100）,上海市重点学科建设基金（批准号：S30105）和国家重点基础研究发展计划（973计划）（批准号：2010CB833104）资助的课题 （）
