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Lett."],"published-print":{"date-parts":[[2026,4,15]]},"abstract":"<jats:p>\n                    Photonic bound states in the continuum (BICs) offer a robust platform for realizing intrinsic strong light\u2013matter coupling in transition-metal dichalcogenides (TMDCs). Here, we demonstrate intrinsic exciton\u2013photon strong coupling in a structurally optimized bulk WSe\n                    <jats:sub>2<\/jats:sub>\n                    split-disk metasurface supporting a toroidal-dipole bound state in the continuum (TD-BIC). Multipolar decomposition and eigenmode analyses confirm the toroidal dipole response and high-\n                    <jats:italic>Q<\/jats:italic>\n                    characteristics of the TD-BIC resonance. The optimized metasurface exhibits pronounced anticrossing and a large Rabi splitting, enabled by enhanced field confinement and increased excitonic oscillator strength. Furthermore, tailoring the split-gap geometry provides precise control over the resonant linewidths and coupling strength. These results establish TD-BIC WSe\n                    <jats:sub>2<\/jats:sub>\n                    metasurfaces as a compact and versatile platform for intrinsic strong-coupling nanophotonics.\n                  <\/jats:p>","DOI":"10.1364\/ol.597135","type":"journal-article","created":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T18:00:13Z","timestamp":1774461613000},"page":"2060","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Intrinsic strong coupling mediated by toroidal-dipole bound states in the continuum in a split-disk WSe\n                    <sub>2<\/sub>\n                    metasurface"],"prefix":"10.1364","volume":"51","author":[{"given":"Xianyan","family":"Wei","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kq0pv72","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaomian","family":"Wu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kq0pv72","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yawei","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kq0pv72","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fu","family":"Deng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kq0pv72","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6262-1070","authenticated-orcid":true,"given":"Weiyi","family":"Hong","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kq0pv72","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,4,3]]},"reference":[{"key":"ol-51-8-2060-R1","doi-asserted-by":"publisher","first-page":"10556","DOI":"10.1021\/acs.nanolett.5c02217","type":"journal-article","volume":"25","author":"He","year":"2025","journal-title":"Nano Lett."},{"key":"ol-51-8-2060-R2","doi-asserted-by":"publisher","first-page":"155429","DOI":"10.1103\/PhysRevB.111.155429","type":"journal-article","volume":"111","author":"Shen","year":"2025","journal-title":"Phys. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}