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Scattering and absorption in dense discrete random media of irregular particles


Markkanen, J; Väisänen, T; Penttilä, A; Muinonen, K (2018). Scattering and absorption in dense discrete random media of irregular particles. Optics letters, 43(12):2925-2928.

Abstract

We present an approximate numerical solution for the multiple scattering problem involving densely packed arbitrarily shaped small particles. We define incoherent volume elements that describe the statistics of the random medium and formulate an order-of-scattering solution for the entire random medium. We apply the T-matrix formalism to compute the incoherent interactions of irregular particles in the sequence of scattering events in the Monte Carlo radiative transfer algorithm. The T-matrices for the volume elements of arbitrarily shaped particles are computed by the volume-integral-equation (VIE)-based T-matrix method. We show that the approximate solution is in agreement with the numerically exact VIE solution for a small spherical random medium. Finally, we demonstrate the importance of applying irregular particle shape models in the analysis of multiple scattering by a large random medium of non-spherical particles.

Abstract

We present an approximate numerical solution for the multiple scattering problem involving densely packed arbitrarily shaped small particles. We define incoherent volume elements that describe the statistics of the random medium and formulate an order-of-scattering solution for the entire random medium. We apply the T-matrix formalism to compute the incoherent interactions of irregular particles in the sequence of scattering events in the Monte Carlo radiative transfer algorithm. The T-matrices for the volume elements of arbitrarily shaped particles are computed by the volume-integral-equation (VIE)-based T-matrix method. We show that the approximate solution is in agreement with the numerically exact VIE solution for a small spherical random medium. Finally, we demonstrate the importance of applying irregular particle shape models in the analysis of multiple scattering by a large random medium of non-spherical particles.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Department of Molecular Mechanisms of Disease
07 Faculty of Science > Department of Molecular Mechanisms of Disease
Dewey Decimal Classification:570 Life sciences; biology
Scopus Subject Areas:Physical Sciences > Atomic and Molecular Physics, and Optics
Uncontrolled Keywords:Atomic and Molecular Physics, and Optics
Language:English
Date:15 June 2018
Deposited On:07 Mar 2019 13:33
Last Modified:16 May 2021 07:14
Publisher:Optical Society of America
ISSN:0146-9592
OA Status:Closed
Publisher DOI:https://doi.org/10.1364/ol.43.002925
PubMed ID:29905725

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