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Simulation Study of Electron Beam Induced Surface Plasmon Excitation at Nanoparticles
Zhe Zheng,Bo Da*,Ke-jun Zhang,Ze-jun Ding*
Author NameAffiliationE-mail
Zhe Zheng CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, ChinaCAS Key Laboratory of Geospace Environment, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China  
Bo Da* Center for Materials research by Information Integration (CMI2), Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan DA.Bo@nims.go.jp 
Ke-jun Zhang CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Ze-jun Ding* CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China 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 energy loss spectroscopy
FundProject:
电子束诱导的纳米颗粒表面等离激元激发模拟
郑 哲,达 博*,章可俊,丁泽军*
摘要:
本文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. 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
DOI:10.1063/1674-0068/31/cjcp1805096
分类号: