{"id":1367,"date":"2024-10-15T16:51:18","date_gmt":"2024-10-15T16:51:18","guid":{"rendered":"https:\/\/novanta.com\/fr\/precision-manufacturing\/resources\/whitepapers\/livre-blanc-sur-la-microscopie-a-super-resolution\/"},"modified":"2026-09-02T11:01:38","modified_gmt":"2026-09-02T11:01:38","slug":"livre-blanc-sur-la-microscopie-a-super-resolution","status":"publish","type":"novanta_tech_paper","link":"https:\/\/novanta.com\/fr\/precision-manufacturing\/ressources\/documents-blancs\/livre-blanc-sur-la-microscopie-a-super-resolution\/","title":{"rendered":"La microscopie \u00e0 super-r\u00e9solution atteint les 14 nm"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-technical-paper-overview\">Pr\u00e9sentation de l&rsquo;article technique<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-choosing-the-right-laser-source-for-14-nm-gsd-super-resolution-donut-zero-contrast-not-laser-wattage-decides-gsd-s-resolution-floor\"><strong>Choisir la source laser adapt\u00e9e \u00e0 la super-r\u00e9solution GSD de 14 nm<\/strong><br><em>C&rsquo;est le contraste \u00ab donut-zero \u00bb, et non la puissance du laser, qui d\u00e9termine la limite inf\u00e9rieure de r\u00e9solution de la GSD.<\/em><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le crit\u00e8re d\u2019Abbe limite les microscopes confocaux conventionnels \u00e0 environ la moiti\u00e9 de la longueur d\u2019onde d\u2019excitation \u2014 ce qui convient pour les cellules, mais s\u2019av\u00e8re inutile pour d\u00e9tecter des paires de centres NV dans le diamant espac\u00e9s de quelques nanom\u00e8tres. La technique GSD (Ground State Depletion) d\u00e9passe cette limite en saturant la fluorescence \u00e0 l\u2019aide d\u2019un faisceau \u00e0 profil en anneau. Mais la r\u00e9solution atteignable d\u00e9pend de l\u2019intensit\u00e9 r\u00e9elle du minimum du \u00ab donut \u00bb. Un laser incapable de maintenir la puret\u00e9 de son mode TEM\u2080\u2080, ou dont le point de vis\u00e9e d\u00e9rive lorsque la puissance augmente, produit un fond de \u00ab donut \u00bb qui n\u2019est pas v\u00e9ritablement sombre \u2014 et la courbe r\u00e9solution-puissance s\u2019aplatit pr\u00e9matur\u00e9ment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cet article technique pr\u00e9sente une configuration optique GSD mise au point par le groupe du professeur Fedor Jelezko \u00e0 l\u2019universit\u00e9 d\u2019Ulm, permettant de r\u00e9soudre les centres NV avec <strong>une largeur \u00e0 mi-hauteur (FWHM) de 14 nm<\/strong> \u2014 r\u00e9sultat obtenu en faisant varier la puissance d\u2019excitation du laser Novanta Laser Quantum gem \u00e0 532 nm de 8,3, 17,3, 38 et 85 mW, tout en pr\u00e9servant la puret\u00e9 du faisceau et la stabilit\u00e9 de pointage sur toute la plage de puissance, la courbe r\u00e9solution-puissance s\u2019ajustant au mod\u00e8le de saturation GSD.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-key-takeaways-include\">Principaux enseignements :<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pourquoi la qualit\u00e9 du faisceau en forme de \u00ab donut \u00bb \u2014 et non la puissance laser brute \u2014 d\u00e9termine la limite inf\u00e9rieure ultime de r\u00e9solution : un minimum non nul du \u00ab donut \u00bb plafonne la r\u00e9solution avant que la saturation ne le fasse<\/li>\n\n\n\n<li>Comment la saturation de la fluorescence du centre NV transforme l\u2019imagerie limit\u00e9e par diffraction en une super-r\u00e9solution \u00e0 puissance modulable \u2014 et quelles sp\u00e9cifications de la source laser r\u00e9sistent \u00e0 cette modulation<\/li>\n\n\n\n<li>Quand privil\u00e9gier un Gem 532 stabilis\u00e9 plut\u00f4t que des sources g\u00e9n\u00e9riques de 532 nm : les applications o\u00f9 un m\u00eame laser doit atteindre 8 mW et 85 mW tout en conservant la pr\u00e9cision de pointage et la puret\u00e9 du mode<\/li>\n\n\n\n<li>Ce que le Gem 532 apporte au GSD : une puret\u00e9 de mode TEM\u2080\u2080, une faible d\u00e9rive de pointage sur toute la plage de puissance, et la stabilit\u00e9 \u00e0 long terme qui rend fiable l&rsquo;\u00e9talonnage r\u00e9solution-puissance<\/li>\n\n\n\n<li>Remarque pratique et prospective : la super-r\u00e9solution par centre NV se situe \u00e0 la crois\u00e9e du traitement de l\u2019information quantique (qubits coupl\u00e9s) et de la biologie (prot\u00e9ines sur nano-diamants) \u2014 deux march\u00e9s en pleine croissance desservis par le m\u00eame laser<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"h-\">T\u00e9l\u00e9chargez l\u2019article technique complet pr\u00e9sentant le sch\u00e9ma de configuration optique du GSD, r\u00e9alis\u00e9 par le groupe de l\u2019universit\u00e9 d\u2019Ulm, la s\u00e9rie de quatre images montrant l\u2019effondrement de la tache sombre, passant de la limite confocale \u00e0 14 nm, ainsi que la courbe de r\u00e9solution en fonction de la puissance \u2014 avant de choisir une source de 532 nm en vous basant uniquement sur ses sp\u00e9cifications de puissance moyenne et de d\u00e9couvrir, \u00e0 85 mW, que c\u2019est la qualit\u00e9 du faisceau, et non la puissance du laser, qui limite votre r\u00e9solution.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9sentation de l&rsquo;article technique Choisir la source laser adapt\u00e9e \u00e0 la super-r\u00e9solution GSD de 14 nmC&rsquo;est le contraste \u00ab donut-zero \u00bb, et non la puissance du laser, qui d\u00e9termine la limite inf\u00e9rieure de r\u00e9solution de la GSD. Le crit\u00e8re d\u2019Abbe limite les microscopes confocaux conventionnels \u00e0 environ la moiti\u00e9 de la longueur d\u2019onde d\u2019excitation \u2014 [&hellip;]<\/p>\n","protected":false},"author":342,"featured_media":385,"template":"","meta":{"_acf_changed":false,"card_thumbnail_id":0,"show_table_of_content":true},"class_list":["post-1367","novanta_tech_paper","type-novanta_tech_paper","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Superresolution Microscopy | Novanta Laser Solutions<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez comment un syst\u00e8me de microscopie confocale \u00e0 laser permet la microscopie \u00e0 super-r\u00e9solution, d\u00e9passant ainsi la limite de diffraction dans le domaine de la recherche sur l&#039;imagerie biom\u00e9dicale par laser.\" \/>\n<meta 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