Transition from isolated to collective modes in plasmonic oligomers.
We demonstrate the transition from isolated to collective optical modes in plasmonic oligomers. Specifically, we investigate the resonant behavior of planar plasmonic hexamers and heptamers with gradually decreasing the interparticle gap separation. A pronounced Fano resonance is observed in the plasmonic heptamer for separations smaller than 60 nm. The spectral characteristics change drastically upon removal of the central nanoparticle. Our work paves the road toward complex hierarchical plasmonic oligomers with tailored optical properties.
Hentschel
Mario
M
4. Physikalisches Institut and Research Center Scope, Universitat Stuttgart, Stuttgart, Germany.
Saliba
Michael
M
Vogelgesang
Ralf
R
Giessen
Harald
H
Alivisatos
A Paul
AP
Liu
Na
N