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arXiv · 1103.5714

Angle-dependence of the frequency correlation in random photonic media: the diffusive regime and its breakdown near localization

Otto L. Muskens·Timmo van der Beek·Ad Lagendijk
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Abstract

The frequency correlations of light in complex photonic media are of interest as a tool for characterizing the dynamical aspects of light diffusion. We demonstrate here that the frequency correlation shows a pronounced angle dependence both in transmission and in reflection geometries. Using a broadband white light supercontinuum, this angle dependence is characterized and explained theoretically by a combination of propagation effects outside the medium and coherent backscattering. We report a strong dependence of the coherent backscattering contribution on the scattering strength which cannot be explained by the diffusion theory. Our results indicate that coherent backscattering of the frequency correlation forms a sensitive probe for the breakdown of the diffusive regime near localization.

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Otto L. Muskens, Timmo van der Beek, Ad Lagendijk. 2011-08-11. Angle-dependence of the frequency correlation in random photonic media: the diffusive regime and its breakdown near localization. https://doi.org/10.1103/physrevb.84.035106

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