On the negative polarization of light scattered by subwavelength regolithic grains

Details On the negative polarization of light scattered by subwavelength regolithic grains On the negative polarization of light scattered by subwavelength regolithic grains

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..550k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 550-552.

Astronomy and Astrophysics

Astronomy

7

Light Scattering, Planetary Surfaces, Polarization (Waves), Regolith, Satellite Surfaces, Astronomical Polarimetry, Grain Size, Planets, Regolith, Grain Size, Polarization, Scattering, Wavelengths, Laboratory Studies, Alumina, Asteroids, Satellites, Surface, Rings, Theoretical Studies, Comparison, Calculations, Analysis, Polarimetry, Photons, Saturn

Scientific paper

Recent laboratory polarimetric measurements of light scattering by layers of alumina grains of different size are used to examine the relevance of the Wolff & Dollfus (1990) 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 (1990) 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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