Plasmon spectra of nanospheres under a tightly focused beam

Year: 2008

Authors: Mojarad N.M., Sandoghdar V., Agio M.

Autors Affiliation: ETH, Nanoopt Grp, Phys Chem Lab, CH-8093 Zurich, Switzerland.

Abstract: We study the modification of the far-field cross sections and the near-field enhancement for gold and silver nanospheres illuminated by a tightly focused beam. Using a multipole-expansion approach we obtain an analytical solution to the scattering problem and provide insight on the effects of focusing on the optical response. Large differences with respect to Mie theory are especially found when the nanoparticle supports quadrupole or higher-order resonances.

Journal/Review: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

Volume: 25 (4)      Pages from: 651  to: 658

KeyWords: Surface-wave Scattering; Metallic Nano-particles; Electromagnetic Diffraction; Optical-systems; Gaussian-beam; Light; Nanoparticles; Fields; Spectroscopy; Energy
DOI: 10.1364/JOSAB.25.000651

Citations: 59
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