The hardest barrier in the way to topological control over light with magnetic fields is extremely weak magneto-optic coupling. Now, strong light-matter coupling in an optical cavity has been used to reach record energy splitting values for photonic spins in magnetic fields. This is a potential game changer for topological photonics.
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Nalitov, A. Polaritons elevate magneto-optic effect. Nat. Photon. 16, 613–614 (2022). https://doi.org/10.1038/s41566-022-01052-5
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DOI: https://doi.org/10.1038/s41566-022-01052-5
