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Title: Visualizing Plasmon Coupling in Closely Spaced Chains of Ag Nanoparticles by Electron Energy-Loss Spectroscopy
Authors: Song, Fengqi ×
Wang, Tingyu
Wang, Xuefeng
Xu, Changhui
Wan, Jianguo
Van Haesendonck, Christian
Ringer, Simon P
Liu, Zongwen
Wang, Guanghou #
Issue Date: Feb-2010
Publisher: Wiley
Series Title: Small vol:6 issue:3 pages:446-451
Abstract: 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.
URI: 
ISSN: 1613-6810
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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