Interaction of Localized Surface Plasmons of a Silver Nanosphere Dimer Embedded in a Uniform Medium: Scanning Transmission Electron Microscopy Electron Energy-Loss Spectroscopy and Discrete Dipole Approximation Simulation
Interaction of Localized Surface Plasmons of a Silver Nanosphere Dimer Embedded in a Uniform Medium: Scanning Transmission Electron Microscopy Electron Energy-Loss Spectroscopy and Discrete Dipole Approximation Simulation
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DOI：
10.1021/acs.jpcc.8b11434
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
N. Sakaguchi;S. Matsumoto;Y. Kunisada;M. Ueda
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文献类型：
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作者：
N. Sakaguchi;S. Matsumoto;Y. Kunisada;M. Ueda
利用扫描透射电子显微镜（tem - eels）研究了硅酸玻璃中银（Ag）纳米球二聚体的局部表面等离子体共振（LSPR）。通过银纳米球附近的电子探针激发了多极子和偶极子的LSPR。对银二聚体的STEM-EELS分析表明，由于双偶极子或多极子耦合的能量损失，出现了一些LSPR耦合模式。当电子束照射在银二聚体外部时，出现了双偶极子的纵向键合模式，其共振能量低于单个银纳米球的偶极子。相反，当电子束在二聚体的银纳米球之间入射时，在比单个银纳米球的共振能量更高的能量下出现了两种模式。对银二聚体周围电场分布的分析表明，这些模式具有经典的纵向反键LS模式的性质。
Localized surface plasmon resonance (LSPR) in a silver (Ag) nanosphere dimer embedded in silicate glass was investigated using scanning transmission electron microscopy electron energy-loss spectroscopy (STEM–EELS). Passing the electron probe near the Ag nanospheres excited the LSPR in the multipole as well as the dipole. STEM–EELS analysis of the Ag dimer indicated that some LSPR coupling modes appeared because of energy loss from the coupling of two dipoles or multipoles. When the electron beam was incident on the outside of the Ag dimer, a longitudinal bonding mode of two dipoles appeared and its resonance energy was lower than that of the dipole of a single Ag nanosphere. Conversely, when the electron beam was incident between the Ag nanospheres of the dimer, two more modes appeared at higher energies than the resonance energy of a single Ag nanosphere. Analysis of the electric field distribution around the Ag dimer suggested that these modes had the nature of the classical longitudinal antibonding LS...