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Proceedings Paper

Simulation of light scattering in clusters of nonspherical nanoparticles: an adapted T-matrix approach
Author(s): Dominik Theobald; Amos Egel; Guillaume Gomard; Uli Lemmer
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Paper Abstract

Being restricted to the domain of validity of spherical wave expansions, the T-matrix method has been in question to model light scattering by nonspherical particle systems when inter-particle distances are low. In this work, we discuss a formalism to account for multiple scattering between nonspherical particles in close vicinity. Accurate coupling between adjacent particles’ scattered fields is achieved by an alternative plane-wave formulation of the translation operator for spherical vector wave functions. The accuracy of the presented approach is demonstrated by a far field simulation of a large particle cluster. The near field of nonspherical particles has not been accessible in T-matrix simulations thus far. Utilizing the benefits of plane-wave expansions, the near field of nonspherical particles can be constructed in T-matrix simulations. We hereby show that the T-matrix method is also applicable for the analysis of localized resonances, making it suitable for the description of plasmonic systems.

Paper Details

Date Published: 4 May 2018
PDF: 9 pages
Proc. SPIE 10672, Nanophotonics VII, 1067229 (4 May 2018); doi: 10.1117/12.2305921
Show Author Affiliations
Dominik Theobald, Karlsruher Institut für Technologie (Germany)
Amos Egel, Karlsruher Institut für Technologie (Germany)
Guillaume Gomard, Karlsruher Institut für Technologie (Germany)
Uli Lemmer, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 10672:
Nanophotonics VII
David L. Andrews; Angus J. Bain; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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