Random electromagnetic fields have a number of distinctive statistical properties that may depend on their origin. We show that, when two mutually coherent fields overlap, their individual characteristics are not completely lost. If assumptions can be made regarding the coherence properties of one of the fields, then the correlation length of the second one can be retrieved using the higher-order polarization properties of the combined field. We demonstrate experimentally that colloidal particles of different sizes can be identified based on polarization correlations measured even in situations of strong multiple scattering.
© 2014 Optical Society of America
Original Manuscript: August 28, 2013
Revised Manuscript: January 21, 2014
Manuscript Accepted: January 29, 2014
Published: March 7, 2014
J. Broky and A. Dogariu, "Polarization correlations in backscattering from media with different optical densities," Opt. Lett. 39, 1465-1468 (2014)