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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

  • Editor: Franco Gori
  • Vol. 31, Iss. 4 — Apr. 1, 2014
  • pp: 745–754

Optical reflectivity of a disordered monolayer of highly scattering particles: coherent scattering model versus experiment

Omar Vázquez-Estrada and Augusto García-Valenzuela  »View Author Affiliations


JOSA A, Vol. 31, Issue 4, pp. 745-754 (2014)
http://dx.doi.org/10.1364/JOSAA.31.000745


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Abstract

Recently a multiple-scattering model for the reflectivity of a disordered monolayer of scattering particles on a flat surface was put forth [J. Opt. Soc. Am. 29, 1161 (2012)]. The approximate theoretical model provides relatively simple formulas for the reflectivity, but it was developed for a monodisperse monolayer. Here we extend the model to the case of a polydisperse monolayer and derive the appropriate formulas to calculate the optical transmissivity of the monolayer supported by a flat interface. A second objective of this paper is to test the approximate theoretical model against experimental data with highly scattering particles. We prepared monolayers of three different surface coverage fractions of polydisperse alumina and titanium dioxide particles deposited randomly on a glass slide. We measured their optical reflectivity and transmissivity versus the angle of incidence using a laser with a wavelength of 670 nm. Using the nominal values for the particles’ most probable radius and refractive index, we fitted the theoretical model to the experimental curves and found that it reproduces very well the experimental curves. Interestingly, a dip in the reflectivity curves at large angles of incidence is present for the alumina monolayers but not in the titanium dioxide monolayers. The dip corresponds to a maximum in the scattering efficiency by the alumina monolayers. The theoretical model reproduces very well this behavior.

© 2014 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(120.7000) Instrumentation, measurement, and metrology : Transmission
(240.0240) Optics at surfaces : Optics at surfaces
(290.4210) Scattering : Multiple scattering
(290.5850) Scattering : Scattering, particles
(290.5825) Scattering : Scattering theory

ToC Category:
Scattering

History
Original Manuscript: December 19, 2013
Manuscript Accepted: January 23, 2014
Published: March 17, 2014

Virtual Issues
Vol. 9, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Omar Vázquez-Estrada and Augusto García-Valenzuela, "Optical reflectivity of a disordered monolayer of highly scattering particles: coherent scattering model versus experiment," J. Opt. Soc. Am. A 31, 745-754 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-4-745

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