{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T12:47:32Z","timestamp":1785415652633,"version":"3.56.0"},"reference-count":30,"publisher":"Optica Publishing Group","issue":"14","license":[{"start":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T00:00:00Z","timestamp":1783296000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T00:00:00Z","timestamp":1783296000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"Postgraduate Scientific Research Innovation Project of Hunan Province","award":["CX20240410"],"award-info":[{"award-number":["CX20240410"]}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Lett."],"published-print":{"date-parts":[[2026,7,15]]},"abstract":"<jats:p>\n                    Nonlinear metasurfaces have emerged as a versatile platform for photon-pair generation through spontaneous parametric down-conversion (SPDC). However, the angular dispersion of optical resonances restricts the emission range and momentum-space uniformity of the generated photon pairs, thereby hindering practical applications in quantum sensing and imaging. Here, we propose and numerically investigate an all-dielectric InGaP metasurface that supports angle-robust photon-pair generation enabled by tailored multipolar flatband resonances. By introducing elliptical nanopores into nonlinear nanodisks, we engineer the far-field coupling and polarization response of weakly dispersive flatband modes while preserving strong field confinement. As a result, the tailored structure exhibits a more than one-order-of-magnitude enhancement in second-harmonic generation efficiency compared with the unperforated design. Based on the quantum-classical correspondence between SPDC and sum-frequency generation (SFG), we further reveal a pronounced enhancement of the nonlinear response and demonstrate stable photon-pair generation with rates up to approximately 2\u00d710\n                    <jats:sup>5<\/jats:sup>\n                    Hz over an angular range of \u00b112\u00b0. In addition, the generated photon pairs remain robust over a broad momentum range and show tunable polarization properties under different pump wavelengths. These results provide a practical route toward compact and efficient quantum light sources in nonlinear metasurfaces, and highlight the potential of flatband engineering for applications in quantum imaging and integrated quantum photonics.\n                  <\/jats:p>","DOI":"10.1364\/ol.605823","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T14:00:12Z","timestamp":1782136812000},"page":"3838","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dispersion-free photon-pair generation enabled by tailored multipolar flatband resonances from a nonlinear metasurface"],"prefix":"10.1364","volume":"51","author":[{"given":"Yu","family":"Mao","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05htk5m33","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Runhai","family":"Hu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05htk5m33","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7225-5411","authenticated-orcid":true,"given":"Yuanjiang","family":"Xiang","sequence":"additional","affiliation":[{"name":"Wenzhou University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7821-7010","authenticated-orcid":true,"given":"Zhixiang","family":"Tang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05htk5m33","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,7,6]]},"reference":[{"key":"ol-51-14-3838-R1","doi-asserted-by":"publisher","first-page":"165","DOI":"10.1038\/nphoton.2007.22","type":"journal-article","volume":"1","author":"Gisin","year":"2007","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"}]}}