1 research outputs found
Exciting Bright and Dark Eigenmodes in Strongly Coupled Asymmetric Metallic Nanoparticle Arrays
The strong coupling between planar arrays of gold and
silver nanoparticles
mediated by a near-field interaction is investigated both theoretically
and experimentally to provide an in-depth study of symmetry breaking
in complex nanoparticle structures. The asymmetric composition allows
to probe for bright and dark eigenmodes, in accordance with plasmon
hybridization theory. The strong coupling could only be observed by
separating the layers by a nanometric distance with monolayers of
suitably chosen polymers. The bottom-up assembly of the nanoparticles
as well as the stratified structures themselves gives rise to an extremely
flexible system that, moreover, allows the facile variation of a number
of important material parameters as well as the preparation of samples
on large scales. This flexibility was used to modify the coupling
distance between arrays, showing that both the positions and relative
intensities of the resonances observed can be tuned with a high degree
of precision. Our work renders research in the field of “plasmonic
molecules” mature to the extent that it could be incorporated
into functional optical devices