Plasmon electron energy-gain spectroscopy
Plasmon electron energy-gain spectroscopy
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DOI：
10.1088/1367-2630/15/10/103021
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发表时间：
2013-10-17
影响因子：
3.3
通讯作者：
Garcia de Abajo, F. J.
中科院分区：
文献类型：
--
作者：
Asenjo-Garcia, A.;Garcia de Abajo, F. J.
我们探索了快速电子与共振消逝光场相互作用所经历的多重能量损失和增益。我们预测，在中等激光强度(10(8)Wm(-2))的连续波照射条件下，当电子通过共振等离子体结构时，在一定的百分比范围内会有非常高的增益概率。此外，我们观察到精细结构的增益和损失概率依赖于光波长，这揭示了多等离子体-电子相互作用之间的复杂相互作用。这些结果为基于能量增益分析的新光谱技术的开发奠定了坚实的基础，该技术能够呈现关于采样的共振纳米结构的光学性质的信息。我们为等离子激元支持的贵金属纳米粒子阐述了这一概念。
We explore multiple energy losses and gains undergone by swift electrons interacting with resonant evanescent light fields. We predict remarkably high gain probabilities in the range of a percentage when the electrons are passing near a resonant plasmonic structure under continuous-wave illumination conditions with moderate laser intensities similar to 10(8) W m(-2). Additionally, we observe fine structure in the dependence of the gain and loss probabilities on the light wavelength, which reveals a complex interplay between multiple plasmon-electron interactions. These results constitute a solid basis for the development of a new spectroscopy technique based upon the analysis of energy gains, capable of rendering information on the optical properties of the sampled resonant nanostructures. We illustrate this concept for plasmon-supporting noble metal nanoparticles.