In this Letter, we demonstrate how to optimize the magneto–optic response of a Huygens metasurface composed of square arrays of all-dielectric nano-disk scatterers. We compare cylindrical and shape-modified disks. Both provide a strongly enhanced Faraday rotation that is accompanied by almost 100% transmittance. The shape modification obtained via a Bayesian optimization algorithm results in a 50% increase in the magneto–optic response compared to the best cylindrical disk, providing 15◦ of polarization rotation for a 260 nm thick metasurface.
Bibliographical noteFunding Information:
Funding. Deutsche Forschungsgemeinschaft (DFG), SFB 951, (Project 182087777); Bundesministerium für Bildung und Forschung (BMBF), (Project 13N14149).
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