Speckles generated by skewed, short-coherence light beams

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

doi:10.1088/1367-2630/13/12/123007

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Journal article

Speckles generated by skewed, short-coherence light beams

Brogioli, Doriano Dipartimento di Medicina Sperimentale, Università degli Studi di Milano, Monza, Italy
Salerno, D. Dipartimento di Medicina Sperimentale, Università degli Studi di Milano, Monza, Italy
Croccolo, Fabrizio Physics Department, University of Fribourg, Switzerland
Ziano, R. Dipartimento di Medicina Sperimentale, Università degli Studi di Milano, Monza, Italy
Mantegazza, F. Dipartimento di Medicina Sperimentale, Università degli Studi di Milano, Monza, Italy

11.06.2011

Published in:

New Journal of Physics. - 2011, vol. 13, p. 123007

English 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 'skewed coherence beam', i.e. a short-coherence beam modified such that the field is coherent within slabs that are skewed with respect to the wave fronts. We show that such a beam generates speckles and can be used for heterodyne scattering detection, despite its short temporal coherence. Moreover, we show that the heterodyne signal is not affected by multiple scattering. We suggest that the phenomenon presented here can be used as a means of carrying out heterodyne scattering measurement with any short-coherence radiation, including x-rays.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language