Photon emission from silver particles induced by a high-energy electron beam
Photon emission from silver particles induced by a high-energy electron beam
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DOI：
10.1103/physrevb.64.205419
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发表时间：
2001-11-15
影响因子：
3.7
通讯作者：
de Abajo, FJG
中科院分区：
文献类型：
--
作者：
Yamamoto, N;Araya, K;de Abajo, FJG
用200 kV透射电子显微镜结合光探测系统测量了电子束诱导亚微米银粒子的光子发射谱。多个峰出现在与集体等离子体激元激发在粒子中产生的入射电子的光谱。观察到这些峰的波长随着颗粒直径的增加而向更大的值移动，如米氏理论所预测的。此外，光子地图已获得扫描模式，它们表明，这些峰值对应于多极模式的电磁振荡在金属球（米氏共振）。的光谱形状的发射和颗粒大小，影响参数，和电子能量的依赖性很好地解释了从理论计算的光子发射概率来自一个完全延迟的分析处理的快速电子与金属球的相互作用。
Photon emission spectra from submicron silver particles induced by an electron beam have been measured using a light detection system combined with a 200-kV transmission electron microscope. Multiple peaks appear in the spectra associated with collective plasmon excitations produced in the particles by the incident electrons. The wavelengths of these peaks are observed to shift towards larger values with increasing particle diameter, as predicted by Mie theory. Moreover, photon maps have been obtained in a scanning mode and they indicate that those peaks correspond to the multipole modes of electromagnetic oscillations in metallic spheres (Mie resonances). The spectral shape of the emission and the dependence on particle size, impact parameter, and electron energy are well explained from theoretical calculations of the photon emission probability derived from a fully retarded analytical treatment of the interaction of fast electrons with metallic spheres.