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Experimental proof of intensity correlations in coherent light transmission through random dielectric samples, suggesting new insights into wave propagation.
We have measured the correlation in frequency-dependent intensity fluctuations in the total transmission through random dielectric samples, using visible light in a (essentially) plane-wave geometry. The correlation function, of which the width at half maximum is proportional to L^-2 (L is the thickness of the sample), decays as ({Δ}{ω})^-1/2. This constitutes the experimental proof for the buildup of long-range intensity correlations in the propagation of classical waves by multiple scattering.
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Albada et al. (1990) studied this question.
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