A Light Scattering Model for Large Particles with Surface Roughness

Harry Ballington; Evelyn Hesse

doi:10.1016/j.jqsrt.2024.109054

A Light Scattering Model for Large Particles with Surface Roughness

Harry Ballington, Evelyn Hesse

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Abstract

A physical-optics hybrid method designed for the computation of single-scattering properties of particles with complex shapes, including surface roughness, is presented. The method applies geometric optics using a novel ray backtracing algorithm to compute the scattered field on the particle surface. A surface integral equation based on the equivalence theorem is used to compute the scattered far-field, which yields the full Mueller matrix and integrated single-scattering parameters. The accuracy is tested against the discrete dipole approximation for fixed orientation smooth and roughened compact hexagonal columns for 3 values of refractive index. The method is found to compute asymmetry parameter, and scattering and extinction efficiencies with mean errors of −1.0%, −1.4%, −1.2%, respectively, in a computation
time reduced by 3 orders of magnitude. The work represents a key step forwards for modelling
particles with physical surface roughness within the framework of physical-optics and provides a versatile tool for the fast and quantitative study of light scattering from non-spherical particles with size much larger than the wavelength.

Original language	English
Article number	109054
Pages (from-to)	1-13
Number of pages	13
Journal	Journal of Quantitative Spectroscopy and Radiative Transfer
Volume	323
Early online date	19 May 2024
DOIs	https://doi.org/10.1016/j.jqsrt.2024.109054
Publication status	Published - Sept 2024

Keywords

Light scattering, Physical optics, Surface roughness, Diffraction
Diffraction
Light scattering
Physical optics
Surface roughness

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10.1016/j.jqsrt.2024.109054Licence: CC BY

Final_Version
© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
Final published version, 3.91 MBLicence: CC BY

Cite this

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title = "A Light Scattering Model for Large Particles with Surface Roughness",

abstract = "A physical-optics hybrid method designed for the computation of single-scattering properties of particles with complex shapes, including surface roughness, is presented. The method applies geometric optics using a novel ray backtracing algorithm to compute the scattered field on the particle surface. A surface integral equation based on the equivalence theorem is used to compute the scattered far-field, which yields the full Mueller matrix and integrated single-scattering parameters. The accuracy is tested against the discrete dipole approximation for fixed orientation smooth and roughened compact hexagonal columns for 3 values of refractive index. The method is found to compute asymmetry parameter, and scattering and extinction efficiencies with mean errors of −1.0%, −1.4%, −1.2%, respectively, in a computationtime reduced by 3 orders of magnitude. The work represents a key step forwards for modellingparticles with physical surface roughness within the framework of physical-optics and provides a versatile tool for the fast and quantitative study of light scattering from non-spherical particles with size much larger than the wavelength.",

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N2 - A physical-optics hybrid method designed for the computation of single-scattering properties of particles with complex shapes, including surface roughness, is presented. The method applies geometric optics using a novel ray backtracing algorithm to compute the scattered field on the particle surface. A surface integral equation based on the equivalence theorem is used to compute the scattered far-field, which yields the full Mueller matrix and integrated single-scattering parameters. The accuracy is tested against the discrete dipole approximation for fixed orientation smooth and roughened compact hexagonal columns for 3 values of refractive index. The method is found to compute asymmetry parameter, and scattering and extinction efficiencies with mean errors of −1.0%, −1.4%, −1.2%, respectively, in a computationtime reduced by 3 orders of magnitude. The work represents a key step forwards for modellingparticles with physical surface roughness within the framework of physical-optics and provides a versatile tool for the fast and quantitative study of light scattering from non-spherical particles with size much larger than the wavelength.

AB - A physical-optics hybrid method designed for the computation of single-scattering properties of particles with complex shapes, including surface roughness, is presented. The method applies geometric optics using a novel ray backtracing algorithm to compute the scattered field on the particle surface. A surface integral equation based on the equivalence theorem is used to compute the scattered far-field, which yields the full Mueller matrix and integrated single-scattering parameters. The accuracy is tested against the discrete dipole approximation for fixed orientation smooth and roughened compact hexagonal columns for 3 values of refractive index. The method is found to compute asymmetry parameter, and scattering and extinction efficiencies with mean errors of −1.0%, −1.4%, −1.2%, respectively, in a computationtime reduced by 3 orders of magnitude. The work represents a key step forwards for modellingparticles with physical surface roughness within the framework of physical-optics and provides a versatile tool for the fast and quantitative study of light scattering from non-spherical particles with size much larger than the wavelength.

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A Light Scattering Model for Large Particles with Surface Roughness

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