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Applied Optics

Applied Optics


  • Vol. 40, Iss. 33 — Nov. 20, 2001
  • pp: 6081–6085

Coupling of surface-plasmon polaritons to directional far-field radiation by an individual surface protrusion

Brian Vohnsen and Sergey I. Bozhevolnyi  »View Author Affiliations

Applied Optics, Vol. 40, Issue 33, pp. 6081-6085 (2001)

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An experimental study of surface-plasmon polariton scattering by an individual surface protrusion on a silver film has been performed. Both in- and out-of-plane scattering have been investigated by imaging with a photon-scanning tunneling microscope at various probe-to-sample distances. For imaging in close proximity we observed a bright spot with rims on the shadow side, but, for imaging at larger distances, the location of the bright spot shifts away from the direction of the incoming surface-plasmon polariton. We estimate a pronounced peak in the far-field scattering pattern at an angle of ∼20° from the sample plane, which is in good agreement with recent theoretical studies and indicates that the same protrusion could possibly be used for local launching of surface-plasmon polaritons in a reversed illumination configuration.

© 2001 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons

Original Manuscript: December 19, 2000
Revised Manuscript: May 21, 2001
Published: November 20, 2001

Brian Vohnsen and Sergey I. Bozhevolnyi, "Coupling of surface-plasmon polaritons to directional far-field radiation by an individual surface protrusion," Appl. Opt. 40, 6081-6085 (2001)

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