{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T06:34:30Z","timestamp":1782801270538,"version":"3.54.5"},"reference-count":56,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T00:00:00Z","timestamp":1776297600000},"content-version":"vor","delay-in-days":15,"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>\n                    Metasurfaces have emerged as a revolutionary platform for high\u2010performance terahertz (THz) sensing, particularly for biochemical trace detection. However, traditional metasurface sensors are fundamentally constrained by their inherent narrowband response, which restricts their molecular identification to isolated resonance frequencies. In this study, we propose a broadband and high\u2010sensitivity THz fingerprint metasensor by exploiting the scalability of perturbed Brillouin zone folding bound states in the continuum (BZF\u2010BIC). The design utilizes a mirror\u2013symmetric, dual\u2010plasmonic elliptical resonator structure where a\n                    <jats:italic>C<\/jats:italic>\n                    <jats:sub>2<\/jats:sub>\n                    symmetry\u2010breaking perturbation is introduced to excite high\u2010\n                    <jats:italic>Q<\/jats:italic>\n                    scalable quasi\u2010BIC (q\u2010BIC) modes characterized by strong localized field enhancement. Crucially, unlike traditional single\u2010frequency detection, our strategy establishes a series of high\u2010\n                    <jats:italic>Q<\/jats:italic>\n                    resonant probes across discrete frequency channels, enabling the high\u2010sensitivity retrieval of molecular absorption fingerprints over a broad THz regime. Numerical simulations demonstrate that the proposed metasensor achieves an average 14\u2010fold enhancement in the extracted molecular absorption signal compared to bare substrate across 0.3 to 0.8\u00a0THz, facilitating the accurate identification of\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010lactose,\n                    <jats:italic>cis<\/jats:italic>\n                    \u2010azobenzene (\n                    <jats:italic>cis<\/jats:italic>\n                    \u2010AB), and benzoic acid. Furthermore, the sensor's capability for trace molecule identification and quantitative concentration analysis is experimentally validated using\n                    <jats:italic>cis<\/jats:italic>\n                    \u2010AB. This work offers a robust and versatile avenue for highly sensitive, broadband on\u2010chip THz spectroscopic analysis systems.\n                  <\/jats:p>","DOI":"10.1002\/nap2.70076","type":"journal-article","created":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T07:23:42Z","timestamp":1776324222000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Broadband THz Molecular Fingerprinting Enabled by Brillouin Zone Folded Quasi\u2010BICs in Plasmonic Metasurfaces"],"prefix":"10.1002","volume":"15","author":[{"given":"Yihan","family":"Xu","sequence":"first","affiliation":[{"name":"Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University  Tianjin 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