{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T17:00:30Z","timestamp":1792083630961,"version":"4.4.0"},"reference-count":25,"publisher":"Optica Publishing Group","issue":"20","license":[{"start":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T00:00:00Z","timestamp":1792022400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T00:00:00Z","timestamp":1792022400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"National Natural Science Foundation of China","award":["11974188"],"award-info":[{"award-number":["11974188"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"National Natural Science Foundation of China","award":["11304159"],"award-info":[{"award-number":["11304159"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"China Postdoctoral Science Foundation","award":["2021T140339"],"award-info":[{"award-number":["2021T140339"]}],"id":[{"id":"https:\/\/ror.org\/0426zh255","id-type":"ROR","asserted-by":"publisher"}]},{"name":"China Postdoctoral Science Foundation","award":["2018M632345"],"award-info":[{"award-number":["2018M632345"]}],"id":[{"id":"https:\/\/ror.org\/0426zh255","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Postdoctoral Science Foundation of Jiangsu Province","award":["2021K617C"],"award-info":[{"award-number":["2021K617C"]}]},{"name":"Qinglan Project of Jiangsu Province of China"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2026,10,15]]},"abstract":"<jats:p>\n                    Chiral metasurfaces have emerged as powerful platforms for manipulating light polarization, with broad applications in sensing and optical communication. However, achieving high-performance, multiband chiral responses remains challenging because it requires simultaneously managing multiple resonances. In this work, we propose a planar all-dielectric chiral metasurface based on an array of bowtie-shaped nanostructures that enables versatile multiband intrinsic and extrinsic chiral responses. By strategically introducing perturbations to break structural symmetry, we successfully excite three distinct quasi-bound states in the continuum (quasi-BICs). At a geometric perturbation of\n                    <jats:italic>\u03b4<\/jats:italic>\n                    = 40\u2009nm, Mode 1 achieves near-perfect left-handed circularly polarized (LCP) transmission (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>LCP<\/jats:sub>\n                    = 0.994,\n                    <jats:italic>C<\/jats:italic>\n                    <jats:italic>D<\/jats:italic>\n                    = \u22120.93). Under oblique incidence (\n                    <jats:italic>\u03b8<\/jats:italic>\n                    = 4\u00b0), Modes 1 and 2 exhibit strong LCP (\n                    <jats:italic>C<\/jats:italic>\n                    <jats:italic>D<\/jats:italic>\n                    = \u22120.84) and RCP (\n                    <jats:italic>C<\/jats:italic>\n                    <jats:italic>D<\/jats:italic>\n                    = 0.63) responses. Multipole decomposition confirms that magnetic dipole (MD) and toroidal dipole (TD) moments, respectively, dominate these resonances. Furthermore, the metasurface achieves a high FOM of 4830.4 RIU\n                    <jats:sup>\u22121<\/jats:sup>\n                    for intrinsic chirality. This work provides an efficient strategy for multiband chiral photonics and integrated devices.\n                  <\/jats:p>","DOI":"10.1364\/ol.611717","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T13:41:56Z","timestamp":1791466916000},"page":"5894","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multiband opposite-sign chirality and sensing empowered by multiple quasi-BICs in all-dielectric metasurfaces"],"prefix":"10.1364","volume":"51","author":[{"given":"Ting","family":"Zhang","sequence":"first","affiliation":[{"name":"Nanjing University of Posts and Telecommunications"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Wang","sequence":"additional","affiliation":[{"name":"Nanjing University of Posts and Telecommunications"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8568-8390","authenticated-orcid":true,"given":"Jing","family":"Chen","sequence":"additional","affiliation":[{"name":"Nanjing University of Posts and Telecommunications"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,10,15]]},"reference":[{"key":"ol-51-20-5894-R1","doi-asserted-by":"publisher","first-page":"e1801790","DOI":"10.1002\/adma.201801790","type":"journal-article","volume":"32","author":"Kong","year":"2020","journal-title":"Adv. Mater."},{"key":"ol-51-20-5894-R2","doi-asserted-by":"publisher","first-page":"3069","DOI":"10.1039\/d1sc06378b","type":"journal-article","volume":"13","author":"Sun","year":"2022","journal-title":"Chem. Sci."},{"key":"ol-51-20-5894-R3","doi-asserted-by":"publisher","first-page":"33429","DOI":"10.1039\/d4ra05694a","type":"journal-article","volume":"14","author":"Senkuttuvan","year":"2024","journal-title":"RSC Adv."},{"key":"ol-51-20-5894-R4","doi-asserted-by":"publisher","first-page":"22242","DOI":"10.1021\/jacs.2c10309","type":"journal-article","volume":"144","author":"Zhang","year":"2022","journal-title":"J. Am. Chem. Soc."},{"key":"ol-51-20-5894-R5","doi-asserted-by":"publisher","first-page":"1700040","DOI":"10.1002\/adom.201700040","type":"journal-article","volume":"5","author":"Luo","year":"2017","journal-title":"Adv. Opt. 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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"}]}}