{"id":2083,"date":"2026-06-16T15:40:09","date_gmt":"2026-06-16T15:40:09","guid":{"rendered":"https:\/\/www.unilim.fr\/labex_sigmalim\/?p=2083"},"modified":"2026-06-17T06:44:44","modified_gmt":"2026-06-17T06:44:44","slug":"publication-extreme-sensitivity-label-free-biosensing-platform-based-on-topologically-disruptive-phase-nano-optics","status":"publish","type":"post","link":"https:\/\/www.unilim.fr\/labex_sigmalim\/2026\/06\/16\/publication-extreme-sensitivity-label-free-biosensing-platform-based-on-topologically-disruptive-phase-nano-optics\/","title":{"rendered":"[Publication] Extreme sensitivity label-free biosensing platform based on topologically disruptive phase nano-optics"},"content":{"rendered":"<p>La d\u00e9tection de mol\u00e9cules en quantit\u00e9s infimes, qu\u2019il s\u2019agisse de marqueurs de maladies, de polluants ou de toxines, constitue un d\u00e9fi majeur pour la sant\u00e9 et la protection de l\u2019environnement. Les capteurs actuels peinent encore \u00e0 identifier ces substances \u00e0 l\u2019\u00e9tat de trace ultime, d\u2019autant qu\u2019elles sont souvent dispers\u00e9es dans des milieux tr\u00e8s complexes, en pr\u00e9sence de nombreuses autres esp\u00e8ces.<\/p>\n<p>Nos recherches men\u00e9es dans le cadre d\u2019une collaboration multidisciplinaire entre plusieurs \u00e9quipes de recherche &#8211; <strong>IRCER <\/strong>et<strong> XLIM<\/strong>*, \u00e0 Limoges et <strong>L2n<\/strong>* \u00e0 Troyes, ayant b\u00e9n\u00e9fici\u00e9 du soutien du LABEX \u2211-LIM**, ont abouti \u00e0 la conception et la fabrication d\u2019un <strong>biocapteur nanocomposite in\u00e9dit<\/strong>. Son originalit\u00e9 r\u00e9side dans une architecture nanocomposite parfaitement contr\u00f4l\u00e9e, sp\u00e9cialement optimis\u00e9e pour exploiter une m\u00e9thode de d\u00e9tection plasmonique ultrasensible\u00a0: le <strong>d\u00e9calage de Goos H\u00e4nchen<\/strong>.<\/p>\n<p>Les nano-architectures int\u00e8grent des nanoparticules d\u2019argent de 2 \u00e0 3 nm de diam\u00e8tre, noy\u00e9es dans un film d\u2019oxyde d\u2019aluminium de 12 nm d\u2019\u00e9paisseur, le tout recouvert d\u2019un film d\u2019or de 48 nm.<\/p>\n<p>Leur fabrication repose sur des proc\u00e9d\u00e9s d\u2019ablation laser en r\u00e9gime nanoseconde, combinant la formation des nanoparticules d\u2019argent par nucl\u00e9ation homog\u00e8ne en phase gazeuse et le d\u00e9p\u00f4t des films d\u2019oxyde d\u2019aluminium et d\u2019or par ablation laser conventionnelle, r\u00e9alis\u00e9s en un seul cycle gr\u00e2ce \u00e0 un syst\u00e8me sp\u00e9cifique d\u00e9velopp\u00e9 \u00e0 l\u2019IRCER.<\/p>\n<p>La d\u00e9tection biologique s\u2019appuie sur la mesure optique du d\u00e9calage lat\u00e9ral de r\u00e9flexion, amplifi\u00e9 par la singularit\u00e9 de phase (d\u00e9calage de Goos H\u00e4nchen), qui est particuli\u00e8rement sensible aux variations d\u2019indice de r\u00e9fraction du milieu environnant\u00a0: le milieu \u00e0 analyser ici. L\u2019amplification significative de l\u2019extinction optique et du d\u00e9calage a \u00e9t\u00e9 confirm\u00e9e par des mod\u00e9lisations th\u00e9oriques, notamment la m\u00e9thode de matrice de transfert (TMM), les simulations des diff\u00e9rences finies dans le domaine temporel (FDTD) et la m\u00e9thode des \u00e9l\u00e9ments finis (FEM).<\/p>\n<p>Les nanocomposites avec une concentration volumique de 16 %vol. en nanoparticules d\u2019argent de taille 2,3 \u00b1 0,9 nm permettent une <strong>d\u00e9tection record et reproductible \u00e0 une concentration de 0,1 attomole par litre de biomarqueurs tumoraux<\/strong> comme TNF-\u03b1 (Tumor Necrosis Factor alpha) [1].<\/p>\n<p>Une telle sensibilit\u00e9 ouvre des perspectives prometteuses pour la d\u00e9tection pr\u00e9coce de <b>pathologies, notamment\u00a0canc\u00e9reuses,\u00a0<\/b> bien avant l\u2019apparition des premiers sympt\u00f4mes, \u00e0 partir d\u2019un simple pr\u00e9l\u00e8vement sanguin.<\/p>\n<p>Cette avanc\u00e9e pourrait transformer\u00a0la m\u00e9decine pr\u00e9ventive et le suivi environnemental, en rendant accessible<b><span style=\"font-size: large\">\u00a0<\/span><\/b>la d\u00e9tection de substances jusqu\u2019alors ind\u00e9tectables.<\/p>\n<p>*IRCER, UMR 7315 CNRS\/Universit\u00e9 de Limoges, *XLIM, UMR 7252 CNRS\/Universit\u00e9 de Limoges, *L2n, UMR 7076 CNRS\/Universit\u00e9 Technologique de Troyes.<\/p>\n<p>** Projet de recherche \u2211-PIX et co-financement de la th\u00e8se de Manon Gireau <em>\u00ab\u00a0<\/em><em>Films composites nano-architectur\u00e9s \u00e9labor\u00e9s par ablation laser impulsionnelle\u00a0: Vers des biocapteurs plasmoniques ultra-sensibles<\/em>\u00a0\u00bb, nov. 2025.<\/p>\n<p>Publication\u00a025 mars 2026 :<\/p>\n[1] <strong><em>Extreme sensitivity label-free biosensing platform based on topologically disruptive phase nano-optics<\/em><\/strong> &#8211; Microsystems &amp; Nanoengineering (2026), 12,106<\/p>\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41378-026-01222-3\">https:\/\/doi.org\/10.1038\/s41378-026-01222-3<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Fusheng DU<\/strong> (<strong>Light, Nanomaterials &amp; Nanotechnologies (L2n), CNRS-UMR 7076, University of Technology of Troyes, 10004, Troyes, France)<\/strong>, <strong>Manon GIREAU<\/strong> (<strong>Institute of research for ceramics (IRCER), CNRS-UMR 7315, University of Limoges, 12 rue Atlantis, 87068, Limoges, France)<\/strong>, <strong>Joelle YOUSSEF<\/strong>, <strong>Georges HUMBERT<\/strong> (<strong>XLIM Research Institute, CNRS-UMR 7252 CNRS, University of Limoges, 123, Av. A. Thomas, 87000, Limoges, France)<\/strong>, <strong>S\u00e9bastien VERGNOLE <\/strong>(<strong>ALPhANOV, Centre technologique Optique &amp;Lasers, 87200, Limoges, France)<\/strong>, <strong>Fr\u00e9d\u00e9ric DUMAS-BOUCHIAT<\/strong>, <strong>Corinne CHAMPEAUX <\/strong>(<strong>Institute of research for ceramics (IRCER), CNRS-UMR 7315, University of Limoges, 12 rue Atlantis, 87068, Limoges, France)<\/strong>, <strong>Shuwen ZENG<\/strong> (<strong>Light, Nanomaterials &amp; Nanotechnologies (L2n), CNRS-UMR 7076, University of Technology of Troyes, 10004, Troyes, France)<\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La d\u00e9tection de mol\u00e9cules en quantit\u00e9s infimes, qu\u2019il s\u2019agisse de marqueurs de maladies, de polluants ou de toxines, constitue un d\u00e9fi majeur pour la sant\u00e9 et la protection de l\u2019environnement. Les capteurs actuels peinent encore \u00e0 identifier ces substances \u00e0 l\u2019\u00e9tat de trace ultime, d\u2019autant qu\u2019elles sont souvent dispers\u00e9es dans des milieux tr\u00e8s complexes, en [&hellip;]<\/p>\n","protected":false},"author":268,"featured_media":2084,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-recherche"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Publication] Extreme sensitivity label-free biosensing platform based on topologically disruptive phase nano-optics - Laboratoire d&#039;Excellence \u2211-LIM<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.unilim.fr\/labex_sigmalim\/2026\/06\/16\/publication-extreme-sensitivity-label-free-biosensing-platform-based-on-topologically-disruptive-phase-nano-optics\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Publication] Extreme sensitivity label-free biosensing platform based on topologically disruptive phase nano-optics - Laboratoire d&#039;Excellence \u2211-LIM\" \/>\n<meta property=\"og:description\" content=\"La d\u00e9tection de mol\u00e9cules en quantit\u00e9s infimes, qu\u2019il s\u2019agisse de marqueurs de maladies, de polluants ou de toxines, constitue un d\u00e9fi majeur pour la sant\u00e9 et la protection de l\u2019environnement. 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