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Light scattering by a cube: Accuracy limits of the discrete dipole approximation and the T-matrix method
SMHI, Research Department, Air quality.ORCID iD: 0000-0001-5695-1356
2013 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 123, 176-183 p.Article in journal (Refereed) Published
Abstract [en]

We simulated light-scattering by small and wavelength-sized cubes with three largely different values of the refractive index using the discrete dipole approximation (DDA) and the T-matrix method. Our main goal was to push the accuracy of both methods to the limit. For the DDA we used an earlier developed extrapolation technique based on simulation results for different levels of discretization. For the T-matrix method we developed a procedure to estimate a confidence range for the simulated value, using results for different values of the truncation index (number of multipoles). In most cases this confidence range was reliable, enclosing the corresponding DDA result. We present benchmark results by both methods, including estimated uncertainties, for selected integral and angle-resolved scattering quantities. Estimated relative uncertainties of the DDA result are unprecedentedly small (from 10(-7) to 10(-3)), while relative differences between the T-matrix and DDA results are larger (from 10(-4) to 0.2) in accordance with estimated T-matrix uncertainties. (C) 2012 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 123, 176-183 p.
Keyword [en]
Discrete dipole approximation, Light scattering simulation, T-matrix, Cube, Benchmark results
National Category
Meteorology and Atmospheric Sciences
Research subject
Environment
Identifiers
URN: urn:nbn:se:smhi:diva-371DOI: 10.1016/j.jqsrt.2012.10.001ISI: 000319095300019OAI: oai:DiVA.org:smhi-371DiVA: diva2:801796
Available from: 2015-04-10 Created: 2015-03-31 Last updated: 2017-12-04Bibliographically approved

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Yurkin, Maxim A.Kahnert, Michael

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