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Decomposing the scattered field of two-dimensional metaatoms into multipole contributions

: Petschulat, J.; Yang, J.; Menzel, C.; Rockstuhl, C.; Chipouline, A.; Lalanne, P.; Tünnermann, A.; Lederer, F.; Pertsch, T.

Fulltext ()

Online im WWW, 2010, 9 pp.
Report, Electronic Publication
Fraunhofer IOF ()
metamaterial; optical near field

We introduce a technique to decompose the scattered near held of two-dimensional arbitrary metaatoms into its multipole contributions. To this end we expand the scattered eld upon plane wave illumination into cylindrical harmonics as known from Mie's theory. By relating these cylindrical harmonics to the held radiated by Cartesian multipoles, the contribution of the lowest order electric and magnetic multipoles can be identified. Revealing these multipoles is essential for the design of metamaterials because they largely determine the character of light propagation. In particular, having this information at hand it is straightforward to distinguish between effects that result either from the arrangement of the metaatoms or from their particular design.