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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 9 — Mar. 20, 1998
  • pp: 1666–1673

Bridging the quasi-static and the physical optics approximations: an elliptic disk case

Mostafa A. Karam  »View Author Affiliations


Applied Optics, Vol. 37, Issue 9, pp. 1666-1673 (1998)
http://dx.doi.org/10.1364/AO.37.001666


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Abstract

A reformulated integral equation is solved inside an elliptic disk particle for an electromagnetic field formulation bridging the quasi-static and the physical optics approximations. The scattering amplitude tensor elements associated with such a field formulation are derived and then used to formulate the extinction cross sections. It is shown that the extinction cross sections have a frequency dependence and an incidence angle dependence similar to those associated with the physical optics approximation, and they have a particle shape dependence similar to that associated with the quasi-static approximation. Furthermore, at the high-frequency limits, it is shown that those cross sections could reach the value known in the literature by the extinction paradox, namely, twice the particle geometric shadow area.

© 1998 Optical Society of America

OCIS Codes
(010.3920) Atmospheric and oceanic optics : Meteorology
(260.0260) Physical optics : Physical optics
(260.2110) Physical optics : Electromagnetic optics
(290.0290) Scattering : Scattering

History
Original Manuscript: May 16, 1997
Revised Manuscript: October 6, 1997
Published: March 20, 1998

Citation
Mostafa A. Karam, "Bridging the quasi-static and the physical optics approximations: an elliptic disk case," Appl. Opt. 37, 1666-1673 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-9-1666

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