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Controllable transport mean free path of light in xerogel matrixes embedded with polystyrene spheres.

Authors
  • Bret, Boris P
  • Couto, Nuno J
  • Amaro, Mariana
  • Nunes-Pereira, Eduardo J
  • Belsley, Michael
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Apr 27, 2009
Volume
17
Issue
9
Pages
6975–6981
Identifiers
PMID: 19399071
Source
Medline
License
Unknown

Abstract

Xerogel matrices, made by sol-gel techniques, are embedded with polystyrene spheres to promote multiple scattering of light. Varying the concentration of the spheres inside the matrix allows one to adjust the transport mean free path of light inside the material. Coherent backscattering measurements show that a range of transport mean free paths from 90 to 600 nm is easily achieved. The determination of the matrix refractive index permits a direct comparison to multiple scattering and Mie theory. Such tunable diffusive sol-gel derived samples can be further optimized as random laser materials.

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