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O: Fachverband Oberflächenphysik
O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects
O 33.1: Poster
Montag, 16. März 2020, 18:15–20:00, P1C
Shape optimization of magneto-optic metasurfaces for enhanced Faraday rotation — •Thomas Kiel1, Paris Varytis1,2, Bettina Beverungen1, Philip Kristensen1, and Kurt Busch1,2 — 1Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin — 2Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin
Magneto-optic nanostructures and the associated effects such as Faraday rotation enable nonreciprocal devices, i.e. miniaturized photonic isolators etc. Although a large Faraday rotation is reported for various nanophotonic geometries, a simultaneous high transmittance is hard to achieve due to material losses. To overcome this limitation, it has been suggested to use a Huygens’ metasurface composed of periodically arranged Ce:BIG nanodiscs embedded in SiO2 [1].
Building on this original idea, we present here how to further increase the Faraday rotation with shape-optimized nanodiscs. The optimization is based on numerical solutions of the Maxwell equations using the discontinuous Galerkin time-domain method [2] with an extension to anisotropic materials [3] in order to model the Ce:BIG. We show that even with a simple optimization strategy, a doubling of the possible Faraday rotation is achievable for nearly the same effective optical thickness of the metasurface.
[1] A. Christofi et al., Opt. letters 43, 1838 (2018)
[2] K. Busch et al., Laser & Photonics Rev. 5, 773 (2011)
[3] J. Alvarez et al., IEEE Ant. Wirel. Propag. Lett. 11, 1182 (2012)