Modelling light scattering by absorbing smooth and slightly rough facetted particles

Evelyn Hesse; C. T. Collier; Antti Penttilä; Timo Nousiainen; Joseph Ulanowski; Paul H. Kaye

doi:10.1016/j.jqsrt.2015.02.004

Modelling light scattering by absorbing smooth and slightly rough facetted particles

Evelyn Hesse, C. T. Collier, Antti Penttilä, Timo Nousiainen, Joseph Ulanowski, Paul H. Kaye

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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.

Original language	English
Pages (from-to)	71-80
Number of pages	10
Journal	Journal of Quantitative Spectroscopy and Radiative Transfer
Volume	157
Early online date	13 Feb 2015
DOIs	https://doi.org/10.1016/j.jqsrt.2015.02.004
Publication status	Published - May 2015

Keywords

Light scattering
Diffraction
Absorbing facettedparticle
Roughparticle

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title = "Modelling light scattering by absorbing smooth and slightly rough facetted particles",

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.",

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T1 - Modelling light scattering by absorbing smooth and slightly rough facetted particles

AU - Hesse, Evelyn

AU - Collier, C. T.

AU - Penttilä, Antti

AU - Nousiainen, Timo

AU - Ulanowski, Joseph

AU - Kaye, Paul H.

PY - 2015/5

Y1 - 2015/5

N2 - 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.

AB - 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.

KW - Light scattering

KW - Diffraction

KW - Absorbing facettedparticle

KW - Roughparticle

U2 - 10.1016/j.jqsrt.2015.02.004

DO - 10.1016/j.jqsrt.2015.02.004

M3 - Article

SN - 0022-4073

VL - 157

SP - 71

EP - 80

JO - Journal of Quantitative Spectroscopy and Radiative Transfer

JF - Journal of Quantitative Spectroscopy and Radiative Transfer

ER -

Modelling light scattering by absorbing smooth and slightly rough facetted particles

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Keywords

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