Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.27: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Interactions in electrically and magnetically coupled stereometamaterials — •Lutz Langguth1, Ralf Vogelgesang2, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart, Germany — 2Max Planck Institut für Festkörperforschung, Stuttgart, Germany
We consider metallic metamaterials which consist of stacked split-ring resonators. Upon twisting of two vertically adjacent split rings, the resonance frequencies of the coupled system change [1]. In split-ring resonators, both electric as well as magnetic interactions are present. Besides dipole interactions, also higher-order modes such as quadrupoles or octupoles play a significant role. We take an analytical model for the electric and magnetic dipole interactions and analyze the spatial dependence of both interactions in the quasistatic limit as well as in the dynamic case. We investigate the distance and the angle dependence of the coupled split-ring modes and find an intriguing behavior, especially at points in space where one or both of the dipole interactions are extremal. Our work explains this behavior in a dipole approximation, points out how to evaluate the strength of higher-order modes and will lead to a better theoretical modelling of the optical properties of stereometamaterials. [1] N. Liu et al., Stereometamaterials, Nat. Phot. 3, 157 (2009)