Fanoshells: nanoparticles with built-in Fano resonances.
A nanoparticle consisting of a dielectric (SiO(2)) and metallic (Au) shell layer surrounding a solid Au nanoparticle core can be designed with its superradiant and subradiant plasmon modes overlapping in energy, resulting in a Fano resonance in its optical response. Synthesis of this nanoparticle around an asymmetric core yields a structure that possesses additional Fano resonances as revealed by single particle dark field microspectroscopy. A mass-and-spring coupled oscillator model provides an excellent description of the plasmon interactions and resultant optical response of this nanoparticle.
Department of Chemistry, Rice University, Houston, Texas 77005, USA.
Shaunak
S
Mukherjee
Heidar
H
Sobhani
J Britt
JB
Lassiter
Rizia
R
Bardhan
Peter
P
Nordlander
Naomi J
NJ
Halas