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Here, we present a magneto\u2010optical metasurface that enables tunable strong coupling for reconfigurable refractive\u2010index sensing through noncontact magnetic\u2010field control without altering the device geometry. The system supports strong coupling between a structural quasi\u2010bound state in the continuum (q\u2010BIC) induced by symmetry breaking and a magneto\u2010structurally induced q\u2010BIC, termed the MS\u2010BIC, giving rise to upper and lower hybrid branches whose spectral positions and Rabi splitting can be actively controlled by an external static magnetic field. For effective refractive indices of the analyte\u2010loaded porous environment ranging from  to 1.15, the upper and lower branches exhibit sensitivities of about 479 and , respectively, whereas the lower branch reaches a figure of merit as high as . Moreover, magnetic\u2010field tuning introduces multiple addressable resonance features under a fixed analyte condition, providing redundant observables for cross\u2010validated and noise\u2010robust sensing. These results establish magnetically reconfigurable strong\u2010coupling metasurfaces as a promising platform for high\u2010performance refractive\u2010index sensing in nanophotonic systems.<\/jats:p>","DOI":"10.1002\/nap2.70174","type":"journal-article","created":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T06:21:06Z","timestamp":1781763666000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Magnetically Reconfigurable Mode Strong Coupling Toward Tunable Nanophotonic Sensing Devices"],"prefix":"10.1002","volume":"15","author":[{"given":"Runmin","family":"Liu","sequence":"first","affiliation":[{"name":"School of Information Engineering Wuhan University of Technology  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shengyi","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physics and Technology Wuhan University  Wuhan 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