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This coupling is also responsible for the appearance of bianisotropy, where electric and magnetic responses become interconnected through the interaction of their respective modes. In this work, we develop a simple and general temporal coupled\u2010mode theory model to describe off\u2010diagonal chiral bianisotropy. Using quasi\u2010bound states in the continuum (q\u2010BICs), we demonstrate how to control the hybridization of modes with opposite symmetries, resulting in Rabi\u2010like splitting between the hybrid states in the regime of strong electromagnetic mode coupling. Beyond revealing the physical origin of the hybrid modes, our model predicts and explains the emergence of dual\u2010band asymmetric reflection and absorption and how to achieve the maximum directional absorption difference. The theoretical predictions are verified by full\u2010wave simulations, showing very good agreement with theory. Furthermore, very strong reciprocal bianisotropy is demonstrated with the use of q\u2010BICs in a deeply subwavelength metasurface in the optical frequency range. Our results provide a clear physical picture of the interaction process between modes, offering a compact theoretical framework for understanding and designing bianisotropic dielectric metasurfaces not only in the traditional regime but also in the strong coupling regime.<\/jats:p>","DOI":"10.1002\/nap2.70145","type":"journal-article","created":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T08:52:16Z","timestamp":1781599936000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Strong Mode Coupling and Maximum Directional Absorption in Reciprocal Bianisotropic Metasurfaces"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3633-3734","authenticated-orcid":false,"given":"L. M.","family":"M\u00e1\u00f1ez\u2010Espina","sequence":"first","affiliation":[{"name":"Nanophotonics Technology Center Universitat Polit\u00e8cnica de Val\u00e8ncia  Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9018-3042","authenticated-orcid":false,"given":"B.","family":"Amrahi","sequence":"additional","affiliation":[{"name":"Department of Electronics and Nanoengineering Aalto University  Espoo Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9840-4737","authenticated-orcid":false,"given":"V. S.","family":"Asadchy","sequence":"additional","affiliation":[{"name":"Department of Electronics and Nanoengineering Aalto University  Espoo Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"D\u00edaz\u2010Rubio","sequence":"additional","affiliation":[{"name":"Nanophotonics Technology Center Universitat Polit\u00e8cnica de Val\u00e8ncia  Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,16]]},"reference":[{"key":"e_1_2_10_2_1","volume-title":"Absorption and Scattering of Light by Small Particles","author":"Bohren C. 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