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Simulation Study of Electron Beam Induced Surface Plasmon Excitation at Nanoparticles
丁泽军
Author NameAffiliationE-mail
丁泽军 安徽省合肥市金寨路96号中国科学技术大学物理系 zjding@ustc.edu.cn 
Abstract:
Phenomenon of localized surface plasmon excitation at nanostructured materials has attracted much attention in recent decades for their wide applications in single molecule detection, surface-enhanced Raman spectroscopy and nano-plasmonics. In addition to the excitation by external light field, an electron beam can also induce the local surface plasmon excitation. Nowadays, electron energy loss spectroscopy (EELS) technique has been increasingly employed in experiment to investigate the surface excitation characteristics of metallic nanoparticles. However, a present theoretical analysis tool for electromagnetic analysis based on the discrete dipole approximation (DDA) method can only treat the case of excitation by light field. In this work we extend the DDA method for the calculation of EELS spectrum for arbitary nanostructured materials. We have simulated EELS spectra for different incident locations of an electron beam on a single silver nanoparticle; the simulated results agree with an experimental measurement very well. The present method then provides a computation tool for study of the local surface plasmon excitation of metallic nanoparticles induced by an electron beam.
Key words:  surface plasmon excitation, nanostructured materials, nanoparticles, electron
FundProject:
电子束诱导的纳米颗粒表面等离激元激发模拟
丁泽军
摘要:
由于单分子探测、表面增强拉曼散射以及纳米光子学研究的高速发展,纳米结构材料的局域表面等离激元激发现象越来越引起重视。除了外加光场引起纳米材料的表面等离激元激发外,电子束也能同样激发表面等离激元。现今,有越来越多的实验采用电子能量损失谱技术来研究金属纳米粒子的表面激发特性,然而现有的采用离散偶极子近似方法来进行电磁特性分析的工具软件都只能计算外光场激发,并不能直接拓展到电子束激发情形,相应的理论只能处理外加光场对纳米粒子的作用。为了解决这一问题,我们基于离散偶极子近似方法,发展出了一套计算任意纳米结构材料的电子能量损失谱的方法和程序。我们模拟了在单个银纳米颗粒附近不同入射位置下的电子能量损失谱,其计算结果与实验能谱非常吻合。虽然离散偶极子近似法早在很多年前就已经被应用到处理外加光场激发的情形,但我们这套方法才真正提供了一个研究电子束诱导金属纳米颗粒局域表面等离激元激发的计算工具。
关键词:  表面等离激元,纳米材料,纳米颗粒,电子能量损失谱
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