Publikation: Observation of long-range correlations in temporal intensity fluctuations of light
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We present evidence for long-range correlations C2(t) in temporal intensity fluctuations of multiply scattered visible light. The time autocorrelation function of the angular-averaged light intensity transmitted through a thin slab containing particles undergoing Brownian motion was determined for a series of different sample thicknesses, beam spot sizes at the sample surface, and optical transport mean free paths l*. The results for both the amplitude (i.e., the inverse conductance 1/g) as well as the time (t) dependence of the correlation function C2(t) are in good overall agreement with theory. Significant deviations are found, however, when correlations generated in a layer of 1l* to 2l* adjacent to the incoming surface become important. In particular the predicted t-1/2 long-time tail of C2(t) was not observed. A physical explanation of these deviations is given based on the argument that at least one scattering event is required before long-range correlations C2(t) can develop.
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SCHEFFOLD, Frank, Wolfram HÄRTL, Georg MARET, Egon MATIJEVIĆ, 1997. Observation of long-range correlations in temporal intensity fluctuations of light. In: Physical Review B. 1997, 56(17), pp. 10942-10952. ISSN 0163-1829. Available under: doi: 10.1103/PhysRevB.56.10942BibTex
@article{Scheffold1997Obser-17584,
year={1997},
doi={10.1103/PhysRevB.56.10942},
title={Observation of long-range correlations in temporal intensity fluctuations of light},
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volume={56},
issn={0163-1829},
journal={Physical Review B},
pages={10942--10952},
author={Scheffold, Frank and Härtl, Wolfram and Maret, Georg and Matijević, Egon}
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