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Lett."],"published-print":{"date-parts":[[2026,5,15]]},"abstract":"<jats:p>\n                    Angle sensitivity to incident light remains a fundamental limitation in conventional Fabry\u2013P\u00e9rot (F-P) and guided-mode resonance (GMR) filters due to the angular dependence of the transverse wave vector. In this work, we propose a compact planar notch filter based on localized guided-mode resonance (LGMR) by embedding a metallic grating within a tri-layer SiO\n                    <jats:sub>2<\/jats:sub>\n                    \u2013Si\u2013SiO\n                    <jats:sub>2<\/jats:sub>\n                    structure. The design achieves three-dimensional (3D) confinement of the transverse wave vector, effectively suppressing angular dispersion and stabilizing the resonance condition. Numerical simulations based on the finite-difference time-domain (FDTD) method demonstrate a flat stop band near 1.55\u2009\u00b5m with a minimal wavelength shift of only 7.4\u2009nm over a broad angular range of 0\u00b0\u201370\u00b0. Spectral tunability in the near-infrared (NIR) region is realized through controlled adjustment of the grating period. The proposed LGMR notch filter provides a robust and integrable solution for angle-insensitive spectral filtering in applications such as Raman spectroscopy and optical communication.\n                  <\/jats:p>","DOI":"10.1364\/ol.598816","type":"journal-article","created":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T12:00:08Z","timestamp":1777636808000},"page":"2972","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Localized guided-mode resonance-enabled highly angle-insensitive optical filtering"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4964-0557","authenticated-orcid":true,"given":"Iqra","family":"Mamoon","sequence":"first","affiliation":[{"name":"Chinese Academy of Sciences"},{"name":"East China Normal University"},{"name":"Shanxi University"},{"name":"University of Chinese Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingquan","family":"Liu","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Md. 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