The geometrical nature of optical resonances: from a sphere to fused dimer nanoparticles

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Abstract

We study the electromagnetic response of smooth gold nanoparticles with shapes varying from a single sphere to two ellipsoids joined smoothly at their vertices. We show that the plasmonic resonance visible in the extinction and absorption cross sections shifts to longer wavelengths and eventually disappears as the mid-plane waist of the composite particle becomes narrower. This process corresponds to an increase of the numbers of internal and scattering modes that are mainly confined to the surface and coupled to the incident field. These modes strongly affect the near field, and therefore are of great importance in surface spectroscopy, but are almost undetectable in the far field.

Original languageEnglish
Article number084002
Number of pages7
JournalMeasurement Science and Technology
Volume23
Issue number8
DOIs
Publication statusPublished - Aug 2012

Keywords

  • geometrical nature
  • optical resonances
  • sphere
  • fused dimer

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