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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 9 — Sep. 26, 2007

Geometrical-optics approximation of forward scattering by gradient-index spheres

Xiangzhen Li, Xiang'e Han, Renxian Li, and Huifen Jiang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5241-5247 (2007)

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By means of geometrical optics we present an approximation method for acceleration of the computation of the scattering intensity distribution within a forward angular range (0–60°) for gradient-index spheres illuminated by a plane wave. The incident angle of reflected light is determined by the scattering angle, thus improving the approximation accuracy. The scattering angle and the optical path length are numerically integrated by a general-purpose integrator. With some special index models, the scattering angle and the optical path length can be expressed by a unique function and the calculation is faster. This method is proved effective for transparent particles with size parameters greater than 50. It fails to give good approximation results at scattering angles whose refractive rays are in the backward direction. For different index models, the geometrical-optics approximation is effective only for forward angles, typically those less than 60° or when the refractive-index difference of a particle is less than a certain value.

© 2007 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(200.0200) Optics in computing : Optics in computing
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles

ToC Category:
Geometrical optics

Original Manuscript: January 31, 2007
Revised Manuscript: April 19, 2007
Manuscript Accepted: April 19, 2007
Published: July 9, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Xiangzhen Li, Xiang'e Han, Renxian Li, and Huifen Jiang, "Geometrical-optics approximation of forward scattering by gradient-index spheres," Appl. Opt. 46, 5241-5247 (2007)

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