Journal
NANO LETTERS
Volume 11, Issue 6, Pages 2440-2445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2008532
Keywords
Surface plasmon; nanoparticles; trimers; dark-field spectroscopy; symmetry; plasmon hybridization
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Funding
- Israel Science Foundation [450/10]
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Artificial plasmonic molecules possess excitation modes that are defined by their symmetry and obey group theory rules, just like conventional molecules. We follow the evolution of surface-plasmon spectra of plasmonic trimers, assembled from equal-sized silver nanoparticles, as gradual geometric changes break their symmetry. The spectral modes of an equilateral triangle, the most symmetric structure of a trimer, are degenerate. This degeneracy is lifted as the symmetry is lowered when one of the vertex angles in opened, which also leads to a subtle transition between bright and dark modes. Our experimental results are quantitatively explained using numerical simulations and plasmon hybridization theory.
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