Europhys. Lett, 48 (1), pp. 22-28 (1999)
Optical transmission through strong scattering and highly polydisperse media
J. Gómez Rivas 1, R. Sprik 1, C. M. Soukoulis 2, K. Busch 3 and A. Lagendijk 1
1 Van der Waals-Zeeman Instituut, Universiteit van Amsterdam
Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands
2 Ames Laboratory and Department of Physics and Astronomy
Iowa State University, Ames, Iowa 50011, USA
3 Institute for Theory of Condensed Matter, Department of Physics
University of Karlsruhe - P.O. Box 6980, 76128 Karlsruhe, Germany
(received 21 December 1999; accepted in final form 3 August 1999)
PACS. 42.25Dd - Wave propagation in random media.
PACS. 78.30Ly - Disordered solids.
We present near infrared total transmission measurements through samples of randomly packed silicon powders. At different wavelengths we analyze in detail the scattering properties and the effects of residual absorption. The lowest value of , where k is the wave vector and is the scattering mean free path, is 3.2. We also observe that is nearly constant over a wide wavelength range. This phenomenon is associated with the high polydispersity of the particles. We use the energy density coherent potential approximation to explain our measurements.
Copyright EDP Sciences