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Speckles generated by skewed, short-coherence light beams

Brogioli, Doriano ; Salerno, D. ; Croccolo, Fabrizio ; Ziano, R. ; Mantegazza, F.

In: New Journal of Physics, 2011, vol. 13, p. 123007

When a coherent laser beam impinges on a random sample (e.g. a colloidal suspension), the scattered light exhibits characteristic speckles. If the temporal coherence of the light source is too short, then the speckles disappear, along with the possibility of performing homodyne or heterodyne scattering detection or photon correlation spectroscopy. Here we investigate the scattering of a so-called...

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Scattering information obtained by optical microscopy: Differential dynamic microscopy and beyond

Giavazzi, Fabio ; Brogioli, Doriano ; Trappe, Véronique ; Bellini, Tommaso ; Cerbino, Roberto

In: Physical Review E, 2009, vol. 80, no. 3, p. 031403

We describe the use of a bright-field microscope for dynamic light scattering experiments on weakly scattering samples. The method is based on collecting a time sequence of microscope images and analyzing them in the Fourier space to extract the characteristic time constants as a function of the scattering wave vector. We derive a theoretical model for microscope imaging that accounts for (a) the...

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