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

Hourahine, B. and Papoff, F. (2012) The geometrical nature of optical resonances : from a sphere to fused dimer nanoparticles. Measurement Science and Technology, 23 (8). ISSN 0957-0233

0957_0233_23_8_084002.pdf - Final Published Version

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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.