Substrate influence on the plasmonic response of clusters of spherical nanoparticles

Details Substrate influence on the plasmonic response of clusters of spherical nanoparticles Substrate influence on the plasmonic response of clusters of spherical nanoparticles

2010-11-15

arxiv.org/abs/1011.3399v2

Phys. Rev. B 83, 075426 (2011)

Physics

Optics

12 pages, 13 figures

Scientific paper

10.1103/PhysRevB.83.075426

The plasmonic response of nanoparticles is exploited in many subfields of science and engineering to enhance optical signals associated with probes of nanoscale and subnanoscale entities. We develop a numerical algorithm based on previous theoretical work that addresses the influence of a substrate on the plasmonic response of collections of nanoparticles of spherical shape. Our method is a real space approach within the quasi-static limit that can be applied to a wide range of structures. We illustrate the role of the substrate through numerical calculations that explore single nanospheres and nanosphere dimers fabricated from either a Drude model metal or from silver on dielectric substrates, and from dielectric spheres on silver substrates.

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