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Lett."],"published-print":{"date-parts":[[2026,7,15]]},"abstract":"<jats:p>\n                    A transverse-magnetic (TM) polarized strip bimodal waveguide (BiMW) sensor operating near a dispersion turning point (DTP) is proposed and experimentally demonstrated on a silicon-on-insulator platform. To enhance the sensitivity of common-path BiMW sensors, near-DTP operation is realized by driving the modal group-index difference toward zero. By exploiting the intrinsic width-dependent dispersion of the TM modes, the DTP is achieved in a standard strip waveguide configuration through waveguide-width optimization, without complex dispersion-engineering structures. With a sensing length of only 0.8\u2009mm, the sensor achieves a refractive-index sensitivity of 7456\u2009nm\/RIU and a limit of detection (LoD) of 1.57 \u00d7 10\n                    <jats:sup>\u22126<\/jats:sup>\n                    RIU. This work provides a compact, fabrication-accessible, and experimentally validated approach for high-performance on-chip refractive-index sensing, with potential applications in biochemical sensing.\n                  <\/jats:p>","DOI":"10.1364\/ol.604826","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T14:00:10Z","timestamp":1782136810000},"page":"4004","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dispersion turning point enhanced on-chip bimodal interferometry"],"prefix":"10.1364","volume":"51","author":[{"given":"Rui","family":"Li","sequence":"first","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiewen","family":"Li","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanxin","family":"Li","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zheng","family":"Cao","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatao","family":"Chen","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanmei","family":"Li","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiming","family":"Yao","sequence":"additional","affiliation":[{"name":"Xili University Town, Harbin Institute of Technology campus"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5259-9380","authenticated-orcid":true,"given":"Lu\u00eds C. 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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"}]}}