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Adv."],"published-print":{"date-parts":[[2026,8,28]]},"abstract":"<jats:p>From atomic crystals to macroscopic material structures, twisted bilayer systems have emerged as a promising route to control wave phenomena. In few-layer van der Waals materials, however, the intrinsically weak interlayer coupling typically demands precise control of small twist angles to reach magic-angle conditions. Here, we show that twisted one-dimensional photonic crystal bilayers can overcome this limitation by accessing a regime of strong interlayer coupling\u2014comparable to intralayer coupling. This strong coupling enables ultrawide flat-band formation even at large twist angles. We experimentally realize this regime by stacking tungsten disulfide gratings using a two-step lithography method, resulting in ultrawide chiral flat-band cascades in magic-angle twisted bilayer gratings. Our work not only provides a platform for designing photonic applications with a tunable photonic band but also explores a previously unidentified regime of physics that is unattainable in conventional solid-state\u2013based moir\u00e9 systems.<\/jats:p>","DOI":"10.1126\/sciadv.aed8846","type":"journal-article","created":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T17:58:31Z","timestamp":1787939911000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Strong interlayer coupling and chiral flat-band cascades in twisted bilayer gratings"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3102-2918","authenticated-orcid":true,"given":"Daegwang","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Physics, Korea University, Seoul 02841, Republic of Korea."},{"name":"Department of Physics and Semiconductor Science, Gachon University, Seongnam 13120, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-8012-3543","authenticated-orcid":true,"given":"Soon-Jae","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics, Korea University, Seoul 02841, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seung-Woon","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Physics, Korea University, Seoul 02841, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3736-5061","authenticated-orcid":true,"given":"Chan Bin","family":"Bark","sequence":"additional","affiliation":[{"name":"Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seik","family":"Pak","sequence":"additional","affiliation":[{"name":"Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-3127-1406","authenticated-orcid":true,"given":"Dong-Jin","family":"Shin","sequence":"additional","affiliation":[{"name":"Department of Physics, Korea University, Seoul 02841, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5991-6055","authenticated-orcid":true,"given":"Moon Jip","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8652-714X","authenticated-orcid":true,"given":"Su-Hyun","family":"Gong","sequence":"additional","affiliation":[{"name":"Department of Physics, Korea University, Seoul 02841, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/nphys1463"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41567-020-0906-9"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41565-022-01165-6"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1108174108"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature26160"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature26154"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41377-022-00977-4"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1364\/JOSAB.19.002052"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2008.139"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-019-1851-6"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41377-021-00601-x"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41565-021-00956-7"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.126.223601"},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.126.136101"},{"key":"e_1_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-023-41068-1"},{"key":"e_1_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-024-54262-6"},{"key":"e_1_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41566-025-01650-z"},{"key":"e_1_3_2_19_2","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adx2361"},{"key":"e_1_3_2_20_2","doi-asserted-by":"crossref","unstructured":"M. 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