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Vibrational coupling in plasmonic molecules
#MMPMID29078373
Yi C
; Dongare PD
; Su MN
; Wang W
; Chakraborty D
; Wen F
; Chang WS
; Sader JE
; Nordlander P
; Halas NJ
; Link S
Proc Natl Acad Sci U S A
2017[Oct]; 114
(44
): 11621-11626
PMID29078373
show ga
Plasmon hybridization theory, inspired by molecular orbital theory, has been
extremely successful in describing the near-field coupling in clusters of
plasmonic nanoparticles, also known as plasmonic molecules. However, the
vibrational modes of plasmonic molecules have been virtually unexplored. By
designing precisely configured plasmonic molecules of varying complexity and
probing them at the individual plasmonic molecule level, intramolecular coupling
of acoustic modes, mediated by the underlying substrate, is observed. The
strength of this coupling can be manipulated through the configuration of the
plasmonic molecules. Surprisingly, classical continuum elastic theory fails to
account for the experimental trends, which are well described by a simple coupled
oscillator picture that assumes the vibrational coupling is mediated by coherent
phonons with low energies. These findings provide a route to the systematic
optical control of the gigahertz response of metallic nanostructures, opening the
door to new optomechanical device strategies.
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