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Absorption and scattering of light from ensembles of randomly oriented aggregates

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Author

Summary, in English

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.

Publishing year

2012

Language

English

Publication/Series

Technical Report LUTEDX/(TEAT-7218)/1-20/(2012)

Document type

Report

Publisher

[Publisher information missing]

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Report number

TEAT-7218

Research group

  • Electromagnetic theory