Nanorice: a hybrid plasmonic nanostructure.
We have designed and fabricated a new hybrid nanoparticle that combines the intense local fields of nanorods with the highly tunable plasmon resonances of nanoshells. This dielectric core-metallic shell prolate spheroid nanoparticle bears a remarkable resemblance to a grain of rice, inspiring the name "nanorice". This geometry possesses far greater structural tunability than either a nanorod or a nanoshell, along with much larger local field intensity enhancements and far greater sensitivity as a surface plasmon resonance (SPR) nanosensor than any dielectric-metal nanostructures reported previously. Invoking the plasmon hybridization picture allows us to understand the plasmon resonances of this geometry, as arising from a hybridization of the primitive plasmons of a solid spheroid and an ellipsoidal cavity inside a continuous metal.
Wang
Hui
H
Department of Chemistry, Rice University, Houston, Texas 77005, USA.
Brandl
Daniel W
DW
Le
Fei
F
Nordlander
Peter
P
Halas
Naomi J
NJ
D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000032:analysis / Q000737:chemistry*; D006046:Gold / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012031:Refractometry; D020349:Surface Plasmon Resonance / Q000379:methods*
D005290:Ferric Compounds; C000499:ferric oxide; D006046:Gold