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Light scattering by hexagonal columns in the discrete dipole approximation

Author(s): Flatau, PJ; Draine, Bruce T.

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Abstract: Scattering by infinite hexagonal ice prisms is calculated using Maxwell’s equations in the discrete dipole approximation for size parameters x = pi D/lambda up to x = 400 (D = prism diameter). Birefringence is included in the calculations. Applicability of the geometric optics approximation is investigated. Excellent agreement between wave optics and geometric optics is observed for large size parameter in the outer part of the 22 degree halo feature. For smaller ice crystals halo broadening is predicted, and there is appreciable “spillover” of the halo into shadow scattering angles < 22 degrees. Ways to retrieve ice crystal sizes are suggested based on the full width at half-maximum of the halo, the power at < 22deg, and the halo polarization. (C) 2014 Optical Society of America
Publication Date: 8-Sep-2014
Electronic Publication Date: 2-Sep-2014
Citation: Flatau, PJ, Draine, BT. (2014). Light scattering by hexagonal columns in the discrete dipole approximation. OPTICS EXPRESS, 22 (21834 - 21846. doi:10.1364/OE.22.021834
DOI: doi:10.1364/OE.22.021834
ISSN: 1094-4087
Pages: 21834 - 21846
Type of Material: Journal Article
Journal/Proceeding Title: OPTICS EXPRESS
Version: Final published version. This is an open access article.

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