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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 20 — Jul. 10, 2006
  • pp: 4990–4999

Extension of geometrical-optics approximation to on-axis Gaussian beam scattering.I.By a spherical particle

Feng Xu, Kuan Fang Ren, and Xiaoshu Cai  »View Author Affiliations


Applied Optics, Vol. 45, Issue 20, pp. 4990-4999 (2006)
http://dx.doi.org/10.1364/AO.45.004990


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Abstract

The geometrical-optics approximation of light scattering by a transparent or absorbing spherical particle is extended from plane wave to Gaussian beam incidence. The formulas for the calculation of  the phase of each ray and the divergence factor are revised, and the interference of all the emerging rays is taken into account. The extended geometrical-optics approximation (EGOA) permits one to calculate the scattering diagram in all directions from 0° to 180°. The intensities of the scattered field calculated by the EGOA are compared with those calculated by the generalized Lorenz–Mie theory, and good agreement is found. The surface wave effect in Gaussian beam scattering is also qualitatively analyzed by introducing a flux ratio factor. The approach proposed is particularly important to the further extension of the geometrical-optics approximation to the scattering of large spheroidal particles.

© 2006 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: November 15, 2005
Revised Manuscript: January 16, 2006
Manuscript Accepted: January 21, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Feng Xu, Kuan Fang Ren, and Xiaoshu Cai, "Extension of geometrical-optics approximation to on-axis Gaussian beam scattering. I. By a spherical particle," Appl. Opt. 45, 4990-4999 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-20-4990


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