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ABSTRACT

Kolokolova et al. 1993

Kolokolova, L.O., M.I. Mishchenko, and M. Wolff, 1993: On the negative polarization of light scattered by subwavelength regolithic grains. M. Not. Royal Astron. Soc., 260, 550-552.

Recent laboratory polarimetric measurements of light scattering by layers of alumina grains of different size are used to examine the relevance of the Wollf & Dollfus theory of negative polarization, which has been developed to describe light scattering by regolithic grains of arbitrary size. It is demonstrated that, while reproducing satisfactorily the main polarization characteristics of light scattering by grains much greater than the wavelength, this theory does not describe the negative polarization of light measured by Geake & Geake for subwavelength-sized grains. The smallest grains exhibit a polarization feature that may be called the 'polarization opposition effect'. This feature requires an alternative explanation and may be due to the so-called weak localization of photons in discrete random media.

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