{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T05:09:18Z","timestamp":1779167358907,"version":"3.51.4"},"reference-count":45,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T00:00:00Z","timestamp":1776643200000},"content-version":"vor","delay-in-days":19,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T00:00:00Z","timestamp":1775001600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Nanophotonics"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>We investigate exciton\u2013polariton condensation in square arrays, composed of either dielectric silicon (Si) or plasmonic silver (Ag) nanodisks, covered with a dye\u2010doped layer. Both arrays support symmetry\u2010protected bound states in the continuum (BICs) at normal incidence, featuring electric quadrupolar  and magnetic dipolar  characters. Due to differences in mode coupling, these BICs are split by  meV in the Si array, whereas they remain nearly degenerate in the Ag array. Simulations reveal that interference in the Ag array results in hybrid modes,  and , which are polarized along orthogonal directions. Interestingly, this results in similar condensation thresholds in both Si and Ag arrays, regardless of the inherent nonradiative losses of Ag, and the confinement of the polariton condensates in the Ag array. Although condensation in the Si array occurs in the  BIC, producing a characteristic donut\u2010shaped far\u2010field emission in k\u2010space, condensation in the Ag array populates the hybrid modes, leading to a double\u2010cross emission pattern extending over a broad range of wave vectors due to the quasi\u2010flat band nature of this mode. As a result, the Ag array also exhibits a strong confinement along the polarization axis in real space. However, for unpolarized emission, there is a similar spatial confinement in both Si and Ag arrays. This control over the confinement of condensates could also be exploited to control interactions. Our results highlight a novel mechanism for condensate confinement with potential applications in quantum computing and polaritonic circuitry.<\/jats:p>","DOI":"10.1002\/nap2.70092","type":"journal-article","created":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T11:21:47Z","timestamp":1776684107000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Confinement of Polariton Condensates in Quasi\u2010Flat Band BICs in Plasmonic and Dielectric Metasurfaces"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1896-7119","authenticated-orcid":false,"given":"Anton Matthijs","family":"Berghuis","sequence":"first","affiliation":[{"name":"Department of Applied Physics and Science Education and Eindhoven Hendrik Casimir Institute Eindhoven University of Technology  Eindhoven the Netherlands"},{"name":"Institute for Complex Molecular Systems\u2010ICMS, Eindhoven University of Technology  Eindhoven the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose Luis","family":"Pura","sequence":"additional","affiliation":[{"name":"Instituto de Estructura de la Materia (IEM\u2010CSIC), Consejo Superior de Investigaciones Cient\u00edficas  Madrid Spain"},{"name":"GdS\u2010Optronlab F\u00edsica de la Materia Condensada, Universidad de Valladolid  Valladolid Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rafael P.","family":"Argante","sequence":"additional","affiliation":[{"name":"Department of Applied Physics and Science Education and Eindhoven Hendrik Casimir Institute Eindhoven University of Technology  Eindhoven the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shunsuke","family":"Murai","sequence":"additional","affiliation":[{"name":"Department of Physics and Electronics, Graduate School of Engineering Osaka Metropolitan University  Osaka Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5370-3717","authenticated-orcid":false,"given":"Jos\u00e9 A.","family":"S\u00e1nchez\u2010Gil","sequence":"additional","affiliation":[{"name":"Instituto de Estructura de la Materia (IEM\u2010CSIC), Consejo Superior de Investigaciones Cient\u00edficas  Madrid Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8038-0968","authenticated-orcid":false,"given":"Jaime","family":"G\u00f3mez Rivas","sequence":"additional","affiliation":[{"name":"Department of Applied Physics and Science Education and Eindhoven Hendrik Casimir Institute Eindhoven University of Technology  Eindhoven the Netherlands"},{"name":"Institute for Complex Molecular Systems\u2010ICMS, Eindhoven University of Technology  Eindhoven the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,4,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature05131"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2010.86"},{"key":"e_1_2_8_4_1","doi-asserted-by":"crossref","unstructured":"T.Byrnes N. 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