The cross correlation between polarization states of scattered laser speckle as a function of scattering angle is observed for a range of spherical and nonspherical particle suspensions. A variation in the degree of correlation between polarization states is observed, and this information is indicative of the particle shape. A comparison with a theoretical model for small particles is made, suggesting that variations in polarization correlation with angle originate from the nonisotropic polarizability of nonspheres. Experiments are also performed on large spheroids and random-shaped polydispersions, and the results indicate that the measurement method has significant potential for nonsphere detection and characterization.
© 2001 Optical Society of America
(030.5260) Coherence and statistical optics : Photon counting
(030.6600) Coherence and statistical optics : Statistical optics
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(290.5850) Scattering : Scattering, particles
P. R. Smith, O. Kusmartseva, and R. Naimimohasses, "Evidence for particle-shape sensitivity in the correlation between polarization states of light scattering," Opt. Lett. 26, 1289-1291 (2001)