{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T05:58:49Z","timestamp":1785131929499,"version":"3.55.0"},"reference-count":45,"publisher":"Wiley","issue":"14","license":[{"start":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T00:00:00Z","timestamp":1784592000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T00:00:00Z","timestamp":1784592000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12474388"],"award-info":[{"award-number":["12474388"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100017610","name":"Shenzhen Science and Technology Innovation Program","doi-asserted-by":"publisher","award":["JCYJ20230807111706014"],"award-info":[{"award-number":["JCYJ20230807111706014"]}],"id":[{"id":"10.13039\/501100017610","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005145","name":"Basic Research Program of Jiangsu Province","doi-asserted-by":"publisher","award":["BK20243029"],"award-info":[{"award-number":["BK20243029"]}],"id":[{"id":"10.13039\/501100005145","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Nanophotonics"],"published-print":{"date-parts":[[2026,7,27]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Existing realizations of Janus bound states in the continuum (BICs) rely primarily on manipulating polarization singularities derived from accidental BICs. Here, we introduce a distinct strategy to engineer high\u2010order Janus BICs by leveraging interband\u2010coupling\u2010induced unidirectional guided resonances (UGRs). By breaking the out\u2010of\u2010plane symmetry in a square\u2010lattice photonic crystal slab, we manipulate the momentum\u2010space evolution of UGRs, driving them to coalesce with an intrinsic symmetry\u2010protected BIC at the Brillouin zone center. This process gives rise to a high\u2010order Janus BIC exhibiting extreme radiative asymmetry: it yields an upward\u2010radiated vortex beam with a topological charge of \u22123, while maintaining a +1 charge downward. Our findings establish a novel paradigm for tailoring momentum\u2010space polarization singularities, unlocking new potential for generating vortex beams with direction\u2010dependent topological charges in advanced optical information processing.<\/jats:p>","DOI":"10.1002\/nap2.70219","type":"journal-article","created":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T06:38:49Z","timestamp":1784702329000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Order Janus Bound States in the Continuum Assisted by Unidirectional Guided Resonances"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0932-5568","authenticated-orcid":false,"given":"Zengping","family":"Su","sequence":"first","affiliation":[{"name":"Tsinghua Shenzhen International Graduate School Tsinghua University  Shenzhen 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