Speckle-visibility spectroscopy: A tool to study time-varying dynamics

By R. Bandyopadhyay, A. S. Gittings, S. Suh, P. K. Dixon, D. Durian. 2005

383 citations recorded by the source corpus.

We describe a multispeckle dynamic light scattering technique capable of resolving the motion of scattering sites in cases that this motion changes systematically with time. The method is based on the visibility of the speckle pattern formed by the scattered light as detected by a single exposure of a digital camera. Whereas previous multispeckle methods rely on correlations between images, here the connection with scattering site dynamics is made more simply in terms of the variance of intensity among the pixels of the camera for the specified exposure duration. The essence is that the speckle pattern is more visible, i.e., the variance of detected intensity levels is greater, when the dynamics of the scattering site motion is slow compared to the exposure time of the camera. The theory for analyzing the moments of the spatial intensity distribution in terms of the electric-field autocorrelation is presented. It is tested for two well-understood samples, a colloidal suspension of Brownian particles and a...

Subfields: Global and Planetary Change, Physiology, Radiology, Nuclear Medicine and Imaging

View Paper: https://www.semanticscholar.org/paper/3eaa807f8da03759291137ad0ce267e1bac44f6e

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In Radiology, Nuclear Medicine and Imaging

Citations in the corpus

Laser speckle contrast imaging in biomedical optics. (2010, background): “8 is correct if the moving particles are undergoing Brownian motion.(12) Further, the relation between c and the speed of the scattering particles depends on the speed distribution of the scattering particles sampled by the detected light, a topic that is receiving increased attention in the speckle”
Photon Beam Transport and Scientific Instruments at the European XFEL (2017, neutral): “, speckle visibility techniques [110,111] for ultrafast dynamics or X-ray pump X-ray probe, possibly in combination with an optical fs laser pump [112].”