Fano resonances in plasmonic nanoclusters: geometrical and chemical tunability.
Clusters of plasmonic nanoparticles and nanostructures support Fano resonances. Here we show that this spectral feature, produced by the interference between bright and dark modes of the nanoparticle cluster, is strongly dependent upon both geometry and local dielectric environment. This permits a highly sensitive tunability of the Fano dip in both wavelength and amplitude by varying cluster dimensions, geometry, and relative size of the individual nanocluster components. Plasmonic nanoclusters show an unprecedented sensitivity to dielectric environment with a local surface plasmon resonance figure of merit of 5.7, the highest yet reported for localized surface plasmon resonance sensing in a finite nanostructure.
Lassiter
J Britt
JB
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
Sobhani
Heidar
H
Fan
Jonathan A
JA
Kundu
Janardan
J
Capasso
Federico
F
Nordlander
Peter
P
Halas
Naomi J
NJ