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HL: Fachverband Halbleiterphysik

HL 35: Focussed Session: Metasurfaces II

HL 35.4: Vortrag

Donnerstag, 15. März 2018, 10:15–10:30, EW 201

Fundamental mode decomposition in a patch-wire metasurface stack — •Jan Sperrhake, Matthias Falkner, Stefan Fasold, and Thomas Pertsch — Friedrich-Schiller Universität Jena, Institute of Applied Physics, Abbe Center of Photonics, Albert-Einstein-Str. 6, 07745 Jena

A widely studied class of optical materials in modern photonics are artificially structured dielectric or metallic surfaces with geometric parameters in the subwavelength regime of impinging electromagnetic waves. If the optical far-field response of these so called metasurfaces is solely determined by their fundamental mode, they can be considered to be homogeneous in the sense of an effective medium. Then, it is furthermore possible to stack different kinds of metasurfaces and achieve a wide range of artificial optical properties.

In our contribution we demonstrate the decomposition of both amplitude and phase of a transmitted fundamental mode into leading transmissive and contributing interferometric parts. We will apply our approach to a fabricated metasurface stack comprised of a lower layer of gold nano-wires and an upper layer of gold nano-patches. Both are differently periodic such that the stacked layers form a super-cell structure. Usually, these have to be handled employing rigorous numerics albeit covering up some of the finer details of the underlying physics. Instead, we employ a faster semi-analytic algorithm that allows for a deeper analysis.