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Opt."],"published-print":{"date-parts":[[2026,5,20]]},"abstract":"<jats:p>\n                    Higher-order topological photonic crystals offer a promising route for\n\t\t\t\t\trobust light confinement. This work presents a Fano resonance sensing\n\t\t\t\t\tsystem via near-field coupling between two topological corner states\n\t\t\t\t\t(TCSs) in a Kagome photonic crystal. The coupling generates an\n\t\t\t\t\todd-symmetric supermode with suppressed radiative loss and an\n\t\t\t\t\tultra-high eigenmode quality factor. Integrating the coupled TCSs with\n\t\t\t\t\ta topological edge waveguide forms a cavity-waveguide system\n\t\t\t\t\tsupporting sharp Fano resonance. The proposed system exhibits\n\t\t\t\t\texcellent performance, with a sensitivity of 562.75\u00a0nm\/RIU and\n\t\t\t\t\ta maximum figure of merit of 1.22\u00d710\n                    <jats:sup>7<\/jats:sup>\n                    RIU\n                    <jats:sup>\u22121<\/jats:sup>\n                    achieved for the odd-symmetric\n\t\t\t\t\tsupermode. This platform paves the way for advanced higher-order\n\t\t\t\t\ttopology applications in integrated photonics and sensing.\n                  <\/jats:p>","DOI":"10.1364\/ao.584657","type":"journal-article","created":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T18:00:08Z","timestamp":1777917608000},"page":"5200","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Ultra-high-Q Fano resonance based on coupled topological corner states in Kagome photonic crystals"],"prefix":"10.1364","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1049-5970","authenticated-orcid":true,"given":"Yong-Feng","family":"Gao","sequence":"first","affiliation":[{"name":"Jiangsu University"},{"name":"Shandong University"},{"name":"State Key Laboratory of Advanced Optical Communication Systems and Networks of Shanghai Jiao Tong University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Li","sequence":"additional","affiliation":[{"name":"Jiangsu University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji-Ning","family":"Pan","sequence":"additional","affiliation":[{"name":"Jiangsu University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhi-Guo","family":"Yan","sequence":"additional","affiliation":[{"name":"Jiangsu University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao-Zhe","family":"Lin","sequence":"additional","affiliation":[{"name":"Jiangsu University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"En-Ming","family":"Zhang","sequence":"additional","affiliation":[{"name":"Jiangsu University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9073-3956","authenticated-orcid":true,"given":"Qi-Chao","family":"Hou","sequence":"additional","affiliation":[{"name":"Hunan University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,5,19]]},"reference":[{"key":"ao-65-15-5200-R1","doi-asserted-by":"publisher","first-page":"226801","DOI":"10.1103\/PhysRevLett.95.226801","type":"journal-article","volume":"95","author":"Kane","year":"2005","journal-title":"Phys. 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All rights, including\n\t\t\t\t\tfor text and data mining (TDM), Artificial Intelligence (AI) training,\n\t\t\t\t\tand similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}