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Absorption and scattering of light from ensembles of randomly oriented aggregates

Karlsson, Anders LU ; Yi, Tan and Bengtsson, Per-Erik LU (2012) In Technical Report LUTEDX/(TEAT-7218)/1-20/(2012) TEAT-7218.
Abstract
Ensembles of aggregates are important in the areas of aerosols and combustion physics. This paper presents one approach to the absorption and scattering of light from aggregates where the individual primary particles are small compared to the wavelength, whereas the aggregate can be large compared to the wavelength. The method is related to the Rayleigh-Debye-Gans (RDG) theory. The difference is that the near field interaction between primary particles is included and that the primary particles can have arbitrary shape, overlap each other and have a space dependent index of refraction. Closed form expressions are presented for the absorption and scattered intensity of an ensemble of aggregates with random position and orientation. These... (More)
Ensembles of aggregates are important in the areas of aerosols and combustion physics. This paper presents one approach to the absorption and scattering of light from aggregates where the individual primary particles are small compared to the wavelength, whereas the aggregate can be large compared to the wavelength. The method is related to the Rayleigh-Debye-Gans (RDG) theory. The difference is that the near field interaction between primary particles is included and that the primary particles can have arbitrary shape, overlap each other and have a space dependent index of refraction. Closed form expressions are presented for the absorption and scattered intensity of an ensemble of aggregates with random position and orientation. These expressions give fast and accurate numerical evaluations of the scattering and absorption from ensembles of aggregates. The numerical results are compared with the ones obtained from the T-matrix method and the discrete dipole approximation method. (Less)
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Book/Report
publication status
published
subject
in
Technical Report LUTEDX/(TEAT-7218)/1-20/(2012)
volume
TEAT-7218
pages
20 pages
publisher
[Publisher information missing]
language
English
LU publication?
yes
id
562039c2-c97a-4e03-a938-1b8cbf4daa86 (old id 3098489)
date added to LUP
2012-09-25 10:17:35
date last changed
2016-04-16 11:32:03
@misc{562039c2-c97a-4e03-a938-1b8cbf4daa86,
  abstract     = {Ensembles of aggregates are important in the areas of aerosols and combustion physics. This paper presents one approach to the absorption and scattering of light from aggregates where the individual primary particles are small compared to the wavelength, whereas the aggregate can be large compared to the wavelength. The method is related to the Rayleigh-Debye-Gans (RDG) theory. The difference is that the near field interaction between primary particles is included and that the primary particles can have arbitrary shape, overlap each other and have a space dependent index of refraction. Closed form expressions are presented for the absorption and scattered intensity of an ensemble of aggregates with random position and orientation. These expressions give fast and accurate numerical evaluations of the scattering and absorption from ensembles of aggregates. The numerical results are compared with the ones obtained from the T-matrix method and the discrete dipole approximation method.},
  author       = {Karlsson, Anders and Yi, Tan and Bengtsson, Per-Erik},
  language     = {eng},
  pages        = {20},
  publisher    = {ARRAY(0x9b98a18)},
  series       = {Technical Report LUTEDX/(TEAT-7218)/1-20/(2012)},
  title        = {Absorption and scattering of light from ensembles of randomly oriented aggregates},
  volume       = {TEAT-7218},
  year         = {2012},
}