振动表面EELS探针限制Fuchs-Kliewer模式
Vibrational surface EELS probes confined Fuchs-Kliewer modes
摘要：
最近，两份报告已经证明了惊人的可能性，探测振动激发纳米粒子的空间分辨率远小于相应的自由空间声子波长使用电子能量损失谱（EELS）。虽然Lagos等人证明了EELS信号在纳米颗粒上的强烈空间和光谱调制，但Krivanek等人没有。在这里，我们表明，不同的EELS实验之间的差异，以及它们之间的关系，光学近场和远场光学实验可以理解通过引入受限的明亮和黑暗的Fuchs-Kliewer模式的概念，其状态密度探测EELS。这种简洁的形式主义是广泛使用的局部表面等离子体振子形式主义的振动对应物;它可以直接预测或解释局部表面等离子体振子已知的现象，如与环境相关的能量转移或相关表面电荷密度的3D映射的可能性。
英文摘要：
Recently, two reports have demonstrated the amazing possibility to probe vibrational excitations from nanoparticles with a spatial resolution much smaller than the corresponding free-space phonon wavelength using electron energy loss spectroscopy (EELS). While Lagos et al. evidenced a strong spatial and spectral modulation of the EELS signal over a nanoparticle, Krivanek et al. did not. Here, we show that discrepancies among different EELS experiments as well as their relation to optical near- and far-field optical experiments can be understood by introducing the concept of confined bright and dark Fuchs-Kliewer modes, whose density of states is probed by EELS. Such a concise formalism is the vibrational counterpart of the broadly used formalism for localized surface plasmons; it makes it straightforward to predict or interpret phenomena already known for localized surface plasmons such as environment-related energy shifts or the possibility of 3D mapping of the related surface charge densities.
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