{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T12:27:58Z","timestamp":1791980878731,"version":"4.4.0"},"reference-count":37,"publisher":"Optica Publishing Group","issue":"9","license":[{"start":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T00:00:00Z","timestamp":1777420800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T00:00:00Z","timestamp":1777420800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["12464050"],"award-info":[{"award-number":["12464050"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["62065007"],"award-info":[{"award-number":["62065007"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["62275112"],"award-info":[{"award-number":["62275112"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["12104402"],"award-info":[{"award-number":["12104402"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"},{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004479","name":"Natural Science Foundation of Jiangxi Province","doi-asserted-by":"crossref","award":["20232ACB201009"],"award-info":[{"award-number":["20232ACB201009"]}],"id":[{"id":"10.13039\/501100004479","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Postgraduate Innovation Fund Project Supported by Jiangxi Provincial Department of Education","award":["YC2025-S410"],"award-info":[{"award-number":["YC2025-S410"]}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2026,5,1]]},"abstract":"<jats:p>\n                    Simultaneously achieving giant chirality, high-efficiency nonlinearity, and robust nonreciprocity remains elusive due to the inherent trade-off between the structural asymmetry required for chiroptics and the high quality (\n                    <jats:italic toggle=\"yes\">Q<\/jats:italic>\n                    ) factors essential for nonlinearity. Here, we overcome this fundamental limitation in silicon metasurfaces by exploiting symmetry-protected bound states in the continuum (BICs). By implementing a two-stage symmetry-breaking mechanism that combines an in-plane structural rotation with out-of-plane height perturbations, we engineer high-\n                    <jats:italic toggle=\"yes\">Q<\/jats:italic>\n                    (\n\t    10\n                    <jats:sup>4<\/jats:sup>\n                    ) resonances dominated by magnetic quadrupole modes. Linearly, the device exhibits robust asymmetric transmission with a forward circular dichroism (CD) of 0.98 and a backward CD of \u22120.79. Leveraging intense near-field confinement, we realize third- and fifth-harmonic generation efficiencies of 3.6 \u00d7 10\n                    <jats:sup>\u22123<\/jats:sup>\n                    and 2.9 \u00d7 10\n                    <jats:sup>\u22129<\/jats:sup>\n                    at a moderate pump intensity of 1\u2009MW\/cm\n                    <jats:sup>2<\/jats:sup>\n                    . Crucially, the chiral-nonlinear coupling enables perfect nonlinear nonreciprocity, yielding near-unity nonlinear CD values of \n\t    \u00b10.99\n\t  . This work establishes a compact paradigm for high-performance chiral nonlinear isolators.\n                  <\/jats:p>","DOI":"10.1364\/ol.593071","type":"journal-article","created":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T11:00:10Z","timestamp":1776769210000},"page":"2680","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Giant nonreciprocal chirality in photonic quasi-BIC systems"],"prefix":"10.1364","volume":"51","author":[{"given":"Yujie","family":"He","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kuihui","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuang","family":"Hu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2373-9089","authenticated-orcid":true,"given":"Xiaoshan","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianping","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6071-326X","authenticated-orcid":true,"given":"Guiqiang","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3435-8177","authenticated-orcid":true,"given":"Chaojun","family":"Tang","sequence":"additional","affiliation":[{"name":"Zhejiang University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2382-4128","authenticated-orcid":true,"given":"Juan","family":"Deng","sequence":"additional","affiliation":[{"name":"Zhejiang University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0087-8871","authenticated-orcid":true,"given":"Zhengqi","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05nkgk822","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,4,29]]},"reference":[{"key":"ol-51-9-2680-R1","doi-asserted-by":"publisher","first-page":"5077","DOI":"10.1038\/s41467-024-49436-1","type":"journal-article","volume":"15","author":"Tripathi","year":"2024","journal-title":"Nat. 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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"}]}}