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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 9 — Mar. 19, 2004
  • pp: 1870–1879

Geometrical-optics approximation of forward scattering by coated particles

Feng Xu, Xiaoshu Cai, and Kuanfang Ren  »View Author Affiliations


Applied Optics, Vol. 43, Issue 9, pp. 1870-1879 (2004)
http://dx.doi.org/10.1364/AO.43.001870


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Abstract

By means of geometrical optics we present an approximation algorithm with which to accelerate the computation of scattering intensity distribution within a forward angular range (0°–60°) for coated particles illuminated by a collimated incident beam. Phases of emerging rays are exactly calculated to improve the approximation precision. This method proves effective for transparent and tiny absorbent particles with size parameters larger than 75 but fails to give good approximation results at scattering angles at which refractive rays are absent. When the absorption coefficient of a particle is greater than 0.01, the geometrical optics approximation is effective only for forward small angles, typically less than 10° or so.

© 2004 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(200.0200) Optics in computing : Optics in computing
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: April 18, 2003
Revised Manuscript: October 3, 2003
Published: March 20, 2004

Citation
Feng Xu, Xiaoshu Cai, and Kuanfang Ren, "Geometrical-optics approximation of forward scattering by coated particles," Appl. Opt. 43, 1870-1879 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-9-1870

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