{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T15:02:44Z","timestamp":1790348564576,"version":"4.1.0"},"reference-count":40,"publisher":"Optica Publishing Group","issue":"28","license":[{"start":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T00:00:00Z","timestamp":1790294400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR"},{"start":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T00:00:00Z","timestamp":1790294400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"name":"Shaanxi Fundamental Science Research Project for Mathematics and Physics","award":["25JSY014"],"award-info":[{"award-number":["25JSY014"]}]},{"name":"Innovation Capability Support Program of Shaanxi","award":["2024CX-GXPT-21"],"award-info":[{"award-number":["2024CX-GXPT-21"]}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Appl. Opt."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:p>\n                    Bound states in the continuum (BICs) have attracted extensive attention in nanophotonics and sensing because they support exceptional optical confinement and ultrahigh quality factors. Dielectric BIC platforms based on high-refractive-index materials are particularly appealing because of their low radiative loss, strong field localization, and rich multipolar responses. Here, we propose a symmetry-protected quasi-BIC metasurface based on the anisotropic dielectric material\n                    <jats:italic>\u03b1<\/jats:italic>\n                    -MoO\n                    <jats:sub>3<\/jats:sub>\n                    for mid-infrared (mid-IR) sensing. By introducing an in-plane symmetry-breaking perturbation through the displacement of the central cylinder within the unit cell, an anisotropic quasi-BIC resonance is excited in the mid-IR regime. Near-field distributions and multipole decomposition reveal that the resonance originates from the hybrid contribution of the electric quadrupole (EQ) and magnetic dipole (MD) modes. The optimized device exhibits a high sensitivity of up to 6000\u00a0nm\/RIU and a Q factor of 553. These results deepen our understanding of anisotropic BICs and provide theoretical guidance for the design of compact photonic devices with enhanced sensing functionality.\n                  <\/jats:p>","DOI":"10.1364\/ao.612001","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T14:09:12Z","timestamp":1788962952000},"page":"9835","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Anisotropic quasi-bound states in the continuum in an \u03b1-MoO\n                    <sub>3<\/sub>\n                    metasurface for high-Q mid-IR sensing"],"prefix":"10.1364","volume":"65","author":[{"given":"Shao-Peng","family":"Li","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/034t3zs45","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu-Qing","family":"Kong","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/034t3zs45","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pei-Jin","family":"Shang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/034t3zs45","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6109-7163","authenticated-orcid":true,"given":"Dao-Bin","family":"Luo","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/034t3zs45","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,9,25]]},"reference":[{"key":"ao-65-28-9835-R1","doi-asserted-by":"publisher","first-page":"5753","DOI":"10.1038\/ncomms6753","type":"journal-article","volume":"5","author":"Yang","year":"2014","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"}]}}