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首页> 外文期刊>Physical review >Measurement of the dynamics of plasmons inside individual gold nanoparticles using a femtosecond phase-resolved microscope
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Measurement of the dynamics of plasmons inside individual gold nanoparticles using a femtosecond phase-resolved microscope

机译：飞秒相分辨显微镜测量单个金纳米粒子内部等离激元的动力学

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摘要

We demonstrate a phase-sensitive four-wave mixing microscopy in heterodyne detection to resolve the ultrafast changes of the real and imaginary parts of the dielectric function of single small (<40 nm) spherical gold nanoparticles at the surface plasmon resonance. The results are quantitatively described via the transient electron temperature and density in gold considering both intraband and interband transitions. We find that the effect of interband transitions in the excitation is important to explain not only the magnitude of the measured four-wave mixing, but also its initial dynamics, which is dominated by the formation of hot electrons via Auger electron-hole recombination with 70-fs time constant, much faster than the well-characterized 500-fs electron thermalization dynamics for intraband excitation. This microscopy technique enables background-free detection of the complex susceptibility change even in highly scattering environments and can be readily applied to any metal nanostructure.
机译：我们展示了外差检测中的相敏四波混合显微镜，以解决表面等离子体激元共振时单个小（<40 nm）球形金纳米粒子介电功能的实部和虚部的超快速变化。考虑到带内和带间跃迁，通过瞬态电子温度和金的密度定量描述了结果。我们发现，带内跃迁在激励中的作用不仅对解释所测量的四波混频的幅度很重要，而且对其初始动力学也很重要，这主要是由通过俄歇电子空穴复合与70形成热电子形成的-fs时间常数，比带内激励的众所周知的500-fs电子热动力学快得多。这种显微镜技术即使在高度散射的环境中也可以无背景检测复杂的磁化率变化，并且可以轻松地应用于任何金属纳米结构。

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  • 来源
    《Physical review》 |2012年第23期|p.235403.1-235403.11|共11页
  • 作者

    Francesco Masia; Wolfgang Langbein; Paola Borri;

  • 作者单位

    Cardiff University School of Physics and Astronomy, The Parade, Cardiff CF24 3AA, United Kingdom,Cardiff University School of Biosciences, Museum Avenue, Cardiff CF10 3AX, United Kingdom;

    Cardiff University School of Physics and Astronomy, The Parade, Cardiff CF24 3AA, United Kingdom;

    Cardiff University School of Physics and Astronomy, The Parade, Cardiff CF24 3AA, United Kingdom,Cardiff University School of Biosciences, Museum Avenue, Cardiff CF10 3AX, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    nanocrystals and nanoparticles;

    机译：纳米晶体和纳米颗粒;

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