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Updated: Jun 12, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Wide-angle and polarization-insensitive magneto-optical Kerr effect enhancement empowered by Brillouin zone folding
Abstract:
The magneto-optical Kerr effects play a crucial role in photonic devices. We propose Brillouin zone folding (BZF) based on lattice perturbations to achieve multiple ultrahigh-Q toroidal dipole (TD) resonances, enabling polarization- and incident angle-independent enhancement of the magneto-optical Kerr effect at multiple wavelengths. The metasurface achieves perfect 180° Kerr rotation near TD resonances, with the polarization direction designable at any angle. The enhancement arises from prolonged light-magneto-optical medium interaction, which strengthens electric field confinement and magneto-optic coupling. The BZF-TD mode exhibits a tunable quality factor, offering an approach for multi-band nonlinear enhancement. We also demonstrate a refractive index sensor based on enhanced Kerr rotation with a sensitivity of 224 nm/RIU.
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