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

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

2010-02-08

arxiv.org/abs/1002.1571v1

Physics

Optics

Scientific paper

We introduce a technique to decompose the scattered near field of two-dimensional arbitrary metaatoms into its multipole contributions. To this end we expand the scattered field upon plane wave illumination into cylindrical harmonics as known from Mie theory. By relating these cylin- drical harmonics to the field 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 par- ticular, 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.

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