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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

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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.

Item type: Article
ID code: 42181
Keywords: geometrical nature , optical resonances , sphere , fused dimer , Physics, Instrumentation, Applied Mathematics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Depositing user: Pure Administrator
Date Deposited: 23 Nov 2012 15:56
Last modified: 02 Oct 2015 20:25
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