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Understanding the electric and magnetic response of isolated metaatoms by means of a multipolar field decomposition

Abstract : 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's theory. By relating these cylindrical 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 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.
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J. Petschulat, Jianji Yang, C. Menzel, C. Rockstuhl, A. Chipouline, et al.. Understanding the electric and magnetic response of isolated metaatoms by means of a multipolar field decomposition. Optics Express, Optical Society of America, 2010, 18 (14), pp.14454-14466. ⟨hal-00570630⟩

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