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We report on the experimental observation of chiral resonant modes via a free-space spin-preserving Fabry-Pérot cavity using Pancharatnam-Berry phase reflecting dielectric metasurface mirrors. Such meta-mirrors focus one spin state while diverging the other and preserve the helicity upon reflection.
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Behrooz Semnani, Mohammad Soltani, Anna Maria Houk, Sema Kuru, Athena Xu, Michal Bajcsy, "Observation of chiral cavity modes," Proc. SPIE 12897, High Contrast Metastructures XIII, 1289702 (13 March 2024); https://doi.org/10.1117/12.3000745