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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 7 — Jul. 1, 2001
  • pp: 1507–1518

High-order perturbation theory for light scattering from a rough metal surface

K. A. O’Donnell  »View Author Affiliations


JOSA A, Vol. 18, Issue 7, pp. 1507-1518 (2001)
http://dx.doi.org/10.1364/JOSAA.18.001507


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Abstract

The angular distribution of the mean diffuse intensity scattered from a metal surface with one-dimensional roughness is studied with perturbation theory. From an approach based on the reduced Rayleigh equations in p polarization, exact perturbation terms up to eighth order in the height parameter are developed for surface roughness consistent with a stationary Gaussian process. The theory is evaluated for a number of cases in which surface plasmon polariton excitation is significant and produces effects such as backscattering enhancement. For surface roughness having a wide Gaussian power spectrum, it is found that the high-order terms lead to roughness-induced broadening of the backscattering peak. For rectangular spectra, two cases are studied in which backscattering effects are due to sixth- and eighth-order terms; both cases provide good comparisons with previously unexplained experimental results. Further, because of an eighth-order term, the diffuse intensity is shown to contain a specular peak that also relies on polariton excitation. This new effect is studied in detail and is found to arise from the constructive interference of contributions produced by multiple-scattering processes, although the time-reversed paths that produce backscattering enhancement are not essential to the specular effect.

© 2001 Optical Society of America

OCIS Codes
(240.5770) Optics at surfaces : Roughness
(240.6680) Optics at surfaces : Surface plasmons
(290.5880) Scattering : Scattering, rough surfaces

History
Original Manuscript: October 17, 2000
Manuscript Accepted: December 20, 2000
Published: July 1, 2001

Citation
K. A. O’Donnell, "High-order perturbation theory for light scattering from a rough metal surface," J. Opt. Soc. Am. A 18, 1507-1518 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-7-1507

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