Abstract
Magnetooptical Faraday effect enables ultrafast photonic devices based on nonreciprocal polarization rotation; however, the intrinsic weakness of Faraday effect prevents miniaturization and practical applications of nonreciprocal photonic devices. Magnetoplasmonics offers new mechanisms for enhancing magnetooptical effects using surface plasmon resonances, which generally have narrow bandwidths. Using finite-difference time-domain modeling, we demonstrate a magnetoplasmonic metasurface, which remarkably enhances the Faraday effect in a wide spectral range. While Faraday rotation in a bare bismuth-substituted yttrium iron garnet film is below 0.02° in the studied range of 600–1600 nm, the proposed metasurface yields few degrees of rotation in a broad band with a maximum exceeding 6.5°, which indicates about three orders of magnitude enhancement. We also show that by optimizing the configuration of the system including the geometry and excitation parameters, the metasurface response and operation band can be tuned further, and rotation values higher than 20° can be achieved. Finally, we present guidelines for designing magnetoplasmonic metasurfaces.
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source is considered to be in the x direction (θ = 0°) for these calculations
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This work was financially supported by the European Research Council Advanced Grant (ERC-AdG) Wear3D Project No. 340200, TUBITAK Grant No. 119S362, and TÜBA-GEBİP Award by the Turkish Academy of Sciences.
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Kharratian, S., Urey, H. & Onbaşlı, M.C. Broadband Enhancement of Faraday Effect Using Magnetoplasmonic Metasurfaces. Plasmonics 16, 521–531 (2021). https://doi.org/10.1007/s11468-020-01304-6
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DOI: https://doi.org/10.1007/s11468-020-01304-6