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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. 20, Iss. 2 — Feb. 1, 2003
  • pp: 296–311

Coherent reflectance in a system of random Mie scatterers and its relation to the effective-medium approach

Rubén G. Barrera and Augusto Garcı́a-Valenzuela  »View Author Affiliations


JOSA A, Vol. 20, Issue 2, pp. 296-311 (2003)
http://dx.doi.org/10.1364/JOSAA.20.000296


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Abstract

We consider the coherent reflection and transmission of electromagnetic waves from a slab of a dilute system of randomly located, polarizable, spherical particles. We focus our attention on the case where the size of the spheres is comparable to the wavelength of the incident radiation. First, using wave-scattering and Mie theories, we derive expressions for the coherent fields that are transmitted and reflected by a very thin slab. Then we find the effective-current distribution that would act as a source of these fields. We conclude that if the effective currents were induced in an effective medium, this medium must possess, besides an effective electric permittivity, also an effective magnetic permeability. We find that both of these optical coefficients become functions of the angle of incidence and the polarization of the incident wave. Then we calculate the reflection coefficient of a half-space by considering a semi-infinite pile of thin slabs and compare the result with Fresnel relations. Numerical results are presented for the optical coefficients as well as for the half-space reflectance as a function of several parameters. The reflectance is compared with that obtained without considering the magnetic response. Finally, we discuss the relevance and the physics behind our results and indicate as well the measurements that could be performed to obtain an experimental verification of our theory.

© 2003 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(120.5700) Instrumentation, measurement, and metrology : Reflection
(160.4760) Materials : Optical properties
(290.4210) Scattering : Multiple scattering
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: February 26, 2002
Revised Manuscript: October 1, 2002
Manuscript Accepted: October 1, 2002
Published: February 1, 2003

Citation
Rubén G. Barrera and Augusto Garcı́a-Valenzuela, "Coherent reflectance in a system of random Mie scatterers and its relation to the effective-medium approach," J. Opt. Soc. Am. A 20, 296-311 (2003)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-20-2-296


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