Imaging of Plasmonic Modes of Silver Nanoparticles Using High-Resolution Cathodoluminescence Spectroscopy
Imaging of Plasmonic Modes of Silver Nanoparticles Using High-Resolution Cathodoluminescence Spectroscopy
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DOI：
10.1021/nn900571z
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发表时间：
2009-10-01
期刊：
影响因子：
17.1
通讯作者：
Fang, Nicholas X.
中科院分区：
文献类型：
--
作者：
Chaturvedi, Pratik;Hsu, Keng H.;Fang, Nicholas X.
阴极射线发光光谱已进行银纳米粒子在扫描电子显微镜设置。出现在可见光范围内的硅衬底上制造的粒子的峰示出到达从激发的平面外的本征模的电子束。单色发射图已被示出为在小于25 nm的长度尺度上解决共振等离子体激元模式的空间场变化。对光激发和电子激发两种情况进行了时域差分数值模拟。在电子激发下的辐射发射的结果表明，与实验符合得很好。给出了诱导场的完整矢量描述，补充了实验结果。
Cathodoluminescence spectroscopy has been performed on silver nanoparticles in a scanning electron microscopy setup. Peaks appearing in the visible range for particles fabricated on silicon substrate are shown to arrive from excitation of out-of-plane eigenmodes by the electron beam. Monochromatic emission maps have been shown to resolve spatial field variation of resonant plasmon mode on length scale smaller than 25 nm. Finite-difference time-domain numerical simulations are performed for both the cases of light excitation and electron excitation. The results of radiative emission under electron excitation show an excellent agreement with experiments. A complete vectorial description of induced field is given, which complements the information obtained from experiments.