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Lett."],"published-print":{"date-parts":[[2026,4,1]]},"abstract":"<jats:p>\n                    Harnessing bound states in the continuum (BICs) for guiding light in leaky environments has unlocked new possibilities in photonic integrated circuits. BIC confinement enables low-loss waveguiding of leaky TM modes in etchless waveguides based on dielectric wires loaded on plane slabs. We have recently reported BIC slow light waveguides by introducing one-dimensional photonic crystals into such etchless waveguides. However, they were restricted to a high symmetry point (X point), limiting their applicability. In this Letter, we propose and numerically demonstrate BIC slow light waveguides at off-high symmetry points by exploiting Friedrich-Wintgen BICs, arising from the interband coupling of two guided modes sharing a radiation continuum. We identified a systematic approach for tuning the loss minimum position in momentum space and simultaneously achieved a high group index over 100 and a low propagation loss of less than 5.0\u00d710\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u2009dB\/cm at an off-high symmetry point. Our findings pave the way for advanced control of light\u2013matter interactions in non-Hermitian photonic systems.\n                  <\/jats:p>","DOI":"10.1364\/ol.591451","type":"journal-article","created":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T12:00:08Z","timestamp":1772712008000},"page":"1808","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["BIC slow light waveguides based on interband coupling"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-9742-5014","authenticated-orcid":true,"given":"Sae R.","family":"Endo","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02kn6nx58","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuta","family":"Tanimura","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02kn6nx58","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takahiro","family":"Ito","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02kn6nx58","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6282-3510","authenticated-orcid":true,"given":"Kenta","family":"Takata","sequence":"additional","affiliation":[{"name":"NTT Research, Inc. 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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"}]}}