Extending the applicability of the T-matrix method to light scattering by flat particles on a substrate via truncation of sommerfeld integrals
Autor: | Dominik Theobald, Uli Lemmer, Yuri Eremin, Thomas Wriedt, Amos Egel, Guillaume Gomard |
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Rok vydání: | 2017 |
Předmět: |
Physics
Radiation 010504 meteorology & atmospheric sciences Scattering FOS: Physical sciences 01 natural sciences Atomic and Molecular Physics and Optics Light scattering Computational physics 010309 optics Scattering amplitude Quantum mechanics 0103 physical sciences Light scattering by particles Plane wave expansion Wavenumber T-matrix method Scattering theory Spectroscopy Physics - Optics Optics (physics.optics) 0105 earth and related environmental sciences |
Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer. 202:279-285 |
ISSN: | 0022-4073 |
Popis: | 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 $\kappa_\mathrm{max}$. An appropriate selection of $\kappa_\mathrm{max}$ 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 $\kappa_\mathrm{max}$ 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. Comment: Accepted manuscript. \copyright 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license, http://creativecommons.org/licenses/by-nc-nd/4.0/ |
Databáze: | OpenAIRE |
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