Plasmon spectra of nanospheres under a tightly focused beam
JOSA B, Vol. 25, Issue 4, pp. 651-658 (2008)
http://dx.doi.org/10.1364/JOSAB.25.000651
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- OCIS Codes:
- (260.1960) Physical optics : Diffraction theory
- (260.2110) Physical optics : Electromagnetic optics
- (290.4020) Scattering : Mie theory
- (290.5850) Scattering : Scattering, particles
- (350.4855) Other areas of optics : Optical tweezers or optical manipulation
Scattering
Citation
Nassiredin M. Mojarad, Vahid Sandoghdar, and Mario Agio, "Plasmon spectra of nanospheres under a tightly focused beam," J. Opt. Soc. Am. B 25, 651-658 (2008)
http://www.opticsinfobase.org/abstract.cfm?URI=josab-25-4-651
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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.
© 2008 Optical Society of America
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History
Original Manuscript: November 2, 2007
Revised Manuscript: January 17, 2008
Manuscript Accepted: February 7, 2008
Published: March 31, 2008
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Author Affiliations
ETH Zurich
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