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        Modelling light scattering by absorbing smooth and slightly rough facetted particles

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        Author
        Hesse, Evelyn
        Collier, C. T.
        Penttilä, Antti
        Nousiainen, Timo
        Ulanowski, Joseph
        Kaye, Paul H.
        Attention
        2299/15509
        Abstract
        A method for approximating light scattering properties of strongly absorbing facetted particles which are large compared to the wavelength is presented. It consists in adding the approximated external diffraction and reflection far fields and is demonstrated for a smooth hexagonal prism. This computationally fast method is extended towards prisms with slightly rough surfaces by introducing a surface scaling factor in order to account for edge effects on subfacets forming the rough surface. These effects become more pronounced with decreasing subfacet dimension to wavelength ratio. Azimuthally resolved light scattering patterns, phase functions and degree of linear polarisation obtained by this method and by the Discrete Dipole Approximation are compared for hexagonal prisms with smooth and slightly rough surfaces, respectively.
        Publication date
        2015-05
        Published in
        Journal of Quantitative Spectroscopy and Radiative Transfer
        Published version
        https://doi.org/10.1016/j.jqsrt.2015.02.004
        Other links
        http://hdl.handle.net/2299/15509
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