Optoacoustic response of a single submicronic gold particle revealed by the picosecond ultrasonics technique
Optoacoustic response of a single submicronic gold particle revealed by the picosecond ultrasonics technique
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DOI：
10.1063/1.3205472
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发表时间：
2009-08-10
影响因子：
4
通讯作者：
Ravaine, Serge
中科院分区：
文献类型：
--
作者：
Guillet, Yannick;Rossignol, Clement;Ravaine, Serge
通过飞秒泵浦探针实验揭示了嵌入二氧化硅薄膜中的单个亚微米（430 nm）金颗粒的光声响应。开发了半解析模型来计算瞬态反射率，该瞬态反射率考虑了介质中的光学指数变化以及颗粒和薄膜表面位移。颗粒-薄膜界面的位移被证明是对测量信号的主要贡献。瞬态反射率的声学分量的幅度由粒子埋入薄膜中的深度调制。
The optoacoustic response of a single submicron (430 nm) gold particle embedded in a silica thin film is experimentally revealed by femtosecond pump-probe experiments. A semianalytical model is developed to calculate the transient reflectivity accounting for optical index changes in both media and for particle and film surface displacements. The displacement of the particle-film interface turns out to be the major contribution to the measured signal. The amplitude of the acoustical component of the transient reflectivity is modulated by the depth at which the particle is buried in the film.