{"paper":{"title":"Dual-Polarization Quasi-BIC Refractive Index Sensing via Dielectric Symmetry Breaking in TiO$_2$-BeS Metasurfaces","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A TiO2 nanobar metasurface with a 20 nm BeS gap supports polarization-selective quasi-BIC and magnetic dipole resonances for refractive index sensing.","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Shoumik Debnath, Sudipta Saha","submitted_at":"2026-05-17T17:15:03Z","abstract_excerpt":"A dual-polarization dielectric metasurface sensor based on TiO$_2$ nanobar pairs with a 20\\,nm BeS gap insert is numerically investigated in the near-infrared. The BeS layer introduces dielectric symmetry breaking without requiring geometric asymmetry, enabling polarization-selective excitation of two distinct resonances. Under TE illumination, the structure supports a quasi-BIC resonance at 879.2\\,nm with $Q=128$, whereas TM excitation produces a broader magnetic dipole resonance at 910.8\\,nm with $Q=36$. The spectral separation between the two modes enables simultaneous tracking of both pola"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Under TE illumination the structure supports a quasi-BIC resonance at 879.2 nm with Q=128, whereas TM excitation produces a magnetic dipole resonance at 910.8 nm with Q=36; for background refractive indices from 1.00 to 1.05 the TE and TM resonances exhibit sensitivities of 243.1 and 178.8 nm/RIU respectively.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The numerical FDTD simulations accurately capture the electromagnetic behavior and material properties of the TiO2-BeS structure in a real fabricated device, including the precise effect of the 20 nm BeS gap on dielectric symmetry without unmodeled losses or fabrication imperfections.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A TiO2-BeS metasurface uses dielectric symmetry breaking to produce polarization-selective quasi-BIC and magnetic dipole resonances with reported sensitivities of 243 and 179 nm/RIU in the near-infrared.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A TiO2 nanobar metasurface with a 20 nm BeS gap supports polarization-selective quasi-BIC and magnetic dipole resonances for refractive index sensing.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"77f343d2ef6df68974c784bc73ed682eb298eb52dbc79573b8019216e324b546"},"source":{"id":"2605.17549","kind":"arxiv","version":1},"verdict":{"id":"3edfd7f7-a73a-4f31-8d02-92f6ec9799b2","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T22:32:36.535743Z","strongest_claim":"Under TE illumination the structure supports a quasi-BIC resonance at 879.2 nm with Q=128, whereas TM excitation produces a magnetic dipole resonance at 910.8 nm with Q=36; for background refractive indices from 1.00 to 1.05 the TE and TM resonances exhibit sensitivities of 243.1 and 178.8 nm/RIU respectively.","one_line_summary":"A TiO2-BeS metasurface uses dielectric symmetry breaking to produce polarization-selective quasi-BIC and magnetic dipole resonances with reported sensitivities of 243 and 179 nm/RIU in the near-infrared.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The numerical FDTD simulations accurately capture the electromagnetic behavior and material properties of the TiO2-BeS structure in a real fabricated device, including the precise effect of the 20 nm BeS gap on dielectric symmetry without unmodeled losses or fabrication imperfections.","pith_extraction_headline":"A TiO2 nanobar metasurface with a 20 nm BeS gap supports polarization-selective quasi-BIC and magnetic dipole resonances for refractive index sensing."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.17549/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T23:01:19.456875Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T22:41:13.626683Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T21:33:23.608059Z","status":"skipped","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T21:21:57.542232Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"bd32241f874a1fd3e9508af87cfe8600c9d3f50510d9c3c100df4cebbe4ce91d"},"references":{"count":56,"sample":[{"doi":"","year":2008,"title":"Surface plasmon resonance sensors for detection of chemical and biological species.Chem","work_id":"4da57fa1-5373-4506-9ee3-b18403100ad1","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2022,"title":"Dielectric metasurfaces for next-generation optical biosensing: a comparison with plasmonic sensing.Nanotechnology, 34(40):402001, 2022","work_id":"dfe599fd-150e-4b6b-ad8c-0f549f977846","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"Andreas Tittl, Aleksandrs Leitis, Mingkai Liu, Filiz Yesilkoy, Duk-Yong Choi, Dragomir N. 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