Nanorice: a hybrid plasmonic nanostructure

Nano Lett. 2006 Apr;6(4):827-32. doi: 10.1021/nl060209w.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Crystallization / methods*
  • Ferric Compounds / analysis
  • Ferric Compounds / chemistry*
  • Gold / analysis
  • Gold / chemistry*
  • Materials Testing
  • Nanostructures / chemistry*
  • Nanostructures / ultrastructure*
  • Particle Size
  • Refractometry
  • Surface Plasmon Resonance / methods*

Substances

  • Ferric Compounds
  • ferric oxide
  • Gold