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Light scattering by a cube: Accuracy limits of the discrete dipole approximation and the T-matrix method

M. A. Yurkin ; Michael Kahnert (Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering)
Journal of Quantitative Spectroscopy and Radiative Transfer (0022-4073). Vol. 123 (2013), p. 176-183.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Discrete dipole approximation, Light scattering simulation, T-matrix, Cube, Benchmark results, boundary-condition method, electromagnetic scattering, optical-properties, shaped particles, computations, convergence, formulation, equations



Denna post skapades 2013-06-27. Senast ändrad 2014-02-03.
CPL Pubid: 179405

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering

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Denna publikation är ett resultat av följande projekt:


Aerosol Optics in Global Earth System Modelling (AGES) (VR//2011-3346)