Angle- and Momentum-Resolved Photoelectron Velocity Map Imaging Studies of Thin Au Film and Single Supported Au Nanoshells
Angle- and Momentum-Resolved Photoelectron Velocity Map Imaging Studies of Thin Au Film and Single Supported Au Nanoshells
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DOI：
10.1021/acs.jpcc.7b10846
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
Jacob Pettine;A. Grubisic;D. Nesbitt
中科院分区：
文献类型：
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作者：
Jacob Pettine;A. Grubisic;D. Nesbitt
在多光子激发/光电子发射后，直接测量了10 nm Au薄膜和单个Au纳米壳层上的横向光电子速度分布。这一独特的能力是通过将扫描光电子显微镜与速度图成像相结合来实现的，可以根据样品上的衍射限制位置来产生光电子光谱。通过用弹道(三步)光电子发射模型拟合2D数据，获得了Au薄膜详细的3D光电子速度分布，其中双光子、三光子和d带过程的贡献被识别，并进一步被表征为使用宽可调的、可见的飞秒光学参量振荡器的光子能量的函数。这些技术被进一步应用于研究具有二氧化硅核的单等离子体金纳米壳层的更复杂的行为。强等离激元的近场和远场特征首次通过光学和光电子能谱测量以及理论方法(Mie…
Transverse (2D) photoelectron velocity distributions are directly measured on 10 nm Au film and single Au nanoshells following multiphoton excitation/photoemission. This unique capability is achieved by combining scanning photoemission microscopy with velocity map imaging, yielding photoelectron spectra as a function of diffraction-limited position on a sample. Detailed 3D photoelectron velocity distributions are retrieved for Au film by fitting the 2D data with a ballistic (three-step) photoemission model, where contributions from two-photon, three-photon, and d-band processes are identified and further characterized as a function of photon energy using a broadly tunable, visible femtosecond optical parametric oscillator. These techniques are further applied to investigate the more complex behaviors of single plasmonic Au nanoshells with silica cores. The strong plasmonic near- and far-field signatures are first characterized via optical and photoemission measurements, along with theoretical methods (Mie...