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01280 am a22001453u 4500 |
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194869 |
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|a dc
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|a Muskens, O.
|e author
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|a van der Beek, T.
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|a Lagendijk, A.
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|a Angle dependence of the frequency correlation in random photonic media: diffusive regime and its breakdown near localization
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|c 2011-07.
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|z Get fulltext
|u https://eprints.soton.ac.uk/194869/1/muskensprb_manuscript.pdf
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|a 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 that 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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