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Visualizing Plasmon Coupling in Closely Spaced Chains of Ag Nanoparticles by Electron Energy‐Loss Spectroscopy
Author(s) -
Song Fengqi,
Wang Tingyu,
Wang Xuefeng,
Xu Changhui,
He Longbing,
Wan Jianguo,
Van Haesendonck Christian,
Ringer Simon P.,
Han Min,
Liu Zongwen,
Wang Guanghou
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200901639
Subject(s) - plasmon , electron energy loss spectroscopy , materials science , spectroscopy , molecular physics , discrete dipole approximation , surface plasmon , nanoparticle , coupling (piping) , localized surface plasmon , electron , dipole , optics , transmission electron microscopy , optoelectronics , physics , nanotechnology , scattering , quantum mechanics , metallurgy
Anisotropic plasmon coupling in closely spaced chains of Ag nanoparticles is visualized using electron energy‐loss spectroscopy in a scanning transmission electron microscope. For dimers as the simplest chain, mapping the plasmon excitations with nanometer spatial resolution and an energy resolution of 0.27 eV intuitively identifies two coupling plasmons. The in‐phase mode redshifts from the ultraviolet region as the interparticle spacing is reduced, reaching the visible range at 2.7 eV. Calculations based on the discrete‐dipole approximation confirm its optical activeness, where the longitudinal direction is constructed as the path for light transportation. Two coupling paths are then observed in an inflexed four‐particle chain.