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Extending the applicability of the T-matrix method to light scattering by flat particles on a substrate via truncation of sommerfeld integrals

Egel, Amos; Eremin, Yuri; Wriedt, Thomas; Theobald, Dominik; Lemmer, Uli; Gomard, Guillaume

The simulation of light scattering by particles on a substrate with the T-matrix method relies on the expansion of the scattered field in spherical waves, followed by a plane wave expansion to allow the evaluation of the reflection from the substrate. In practice, the plane wave expansion (i.e., the Sommerfeld integrals) needs to be truncated at a maximal in-plane wavenumber κmax. An appropriate selection of κmax is essential: counter-intuitively, the overall accuracy can degrade significantly if the integrals are truncated with a too large value. In this paper, we propose an empirical formula for the selection of κmax and discuss its application using a number of example simulations with dielectric and metallic oblate spheroids on dielectric and metallic substrates. The computed differential scattering cross sections are compared to results obtained from the discrete-sources method.

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1016/j.jqsrt.2017.08.016
ISSN: 0022-4073, 1879-1352
KITopen ID: 1000073725
HGF-Programm 43.23.04; LK 01
Erschienen in Journal of quantitative spectroscopy & radiative transfer
Band 202
Seiten 279-285
Schlagworte Scattering, T-Matrix, Substrate, Discrete sources method, Multiple scattering
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