Time-resolved Laser Scattering Spectroscopy of a Single Metallic Nanoparticle
Time-resolved Laser Scattering Spectroscopy of a Single Metallic Nanoparticle
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单个金属纳米粒子的时间分辨激光散射光谱
DOI：
10.1143/jjap.40.6143
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发表时间：
2001
影响因子：
1.5
通讯作者：
K. Sasaki
中科院分区：
文献类型：
--
作者：
Y. Matsuo;K. Sasaki
提出了一种新的单金属纳米粒子瞬态吸收光谱技术。该技术基于使用脉冲激光的微分干涉对比（DIC）显微镜。通过泵浦激光束激发单个纳米颗粒，并且测量探测光的DIC信号以精确地确定前向散射光的振幅和相位。在瑞利散射理论的基础上，可以估计激发粒子的折射率和吸收系数。通过改变泵浦脉冲和探测脉冲之间的延迟时间，可以在飞秒时间尺度上观察单个纳米颗粒的吸收动力学。作为初步实验，用这种技术分析了70 nm银胶体粒子的电子动力学。
A new technique is proposed for the transient absorption spectroscopy of a single metallic nanoparticle. This technique is based on a differential interference contrast (DIC) microscopy using pulsed laser light. A single nanoparticle is excited by a pumping laser beam, and the DIC signal of a probing light is measured to precisely determine the amplitude and phase of the forward-scattered light. The refractive index and the absorption coefficient of the excited particle can be estimated on the basis of the Rayleigh scattering theory. By changing the delay time between the pumping and probing pulses, absorption dynamics of a single nanoparticle can be observed on a femtosecond time scale. As a preliminary experiment, the electron dynamics of a 70 nm silver colloidal particle was analyzed with this technique.