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Lett."],"published-print":{"date-parts":[[2026,7,1]]},"abstract":"<jats:p>Bound states in the continuum (BICs) provide an exceptional platform for light\u2013matter interactions with ultrahigh quality factors. However, multifunctional metasurfaces with simple structures for polarization manipulation and dynamic modulation, especially chiroptical response, remain challenging. Here, we propose a planar dielectric metasurface capable of generating and dynamically switching optical chirality. Maximum intrinsic chirality with reversible near-unity circular dichroism (|CD| &gt; 0.992) is realized via a simple one-step in-plane geometric perturbation. Furthermore, by integrating non-volatile Sb\u2082S\u2083, we demonstrate dynamic switching of the chiral response between \u201con\u201d and \u201coff\u201d states with high chirality contrast (\u0394CD~1), functioning as an ultra-narrowband transmissive optical switch for circular polarization. This work provides a promising avenue for compact, reconfigurable chiral photonic devices.<\/jats:p>","DOI":"10.1364\/ol.600503","type":"journal-article","created":{"date-parts":[[2026,6,5]],"date-time":"2026-06-05T12:00:07Z","timestamp":1780660807000},"page":"3509","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Switchable chirality in non-volatile planar metasurfaces based on quasi-bound states in the continuum"],"prefix":"10.1364","volume":"51","author":[{"given":"Yijie","family":"Wei","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00wk2mp56","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingqi","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00wk2mp56","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wujin","family":"Yan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00wk2mp56","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaochuan","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00wk2mp56","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuepei","family":"Cai","sequence":"additional","affiliation":[{"name":"Hohai University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1158-5601","authenticated-orcid":true,"given":"Yong","family":"Huang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00wk2mp56","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,17]]},"reference":[{"key":"ol-51-13-3509-R1","doi-asserted-by":"publisher","first-page":"2306414","DOI":"10.1002\/adma.202306414","type":"journal-article","volume":"36","author":"Gu","year":"2024","journal-title":"Adv. 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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"}]}}