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O: Fachverband Oberflächenphysik

O 64: Plasmonics and nanooptics III

O 64.5: Vortrag

Donnerstag, 29. März 2012, 11:30–11:45, MA 005

Magic Angles in Metamaterials — •Sven M. Hein1, Lutz Langguth1,2, and Harald Giessen114th Physics Institute and Research Center SCOPE, University of Stuttgart, D-70569 Stuttgart, Germany — 2Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics (AMOLF), Science Park 104, 1098 XG Amsterdam, The Netherlands

When coupling two dipoles to each other in three dimensions, there are certain conditions under which the interaction vanishes. This effect is known for example in Nuclear Magnetic Resonance as "Magic Angles". It arises from the fact that at certain geometric arrangements the dipole coupling changes from attractive to repulsive. In 3D metamaterials [1], we have to consider the electric as well as the magnetic dipoles, and beyond spatial variation also twisting is possible, e.g. in stereometamaterials [2]. We investigate this intriguing effect in detail and show that it could be useful to elucidate quadrupole- and higher-order interactions. Allowing for retardation leads to a plethora of fascinating new effects.

[1] N. Liu et al., Nature Materials 7, 31 (2008).
[2] N. Liu and H. Giessen, Nature Photonics 3, 157-162 (2009).

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