{"id":64258,"date":"2020-02-10T11:18:20","date_gmt":"2020-02-10T11:18:20","guid":{"rendered":"https:\/\/\/microlentilles-transparentes-transformant-leffet-moire-en-images-3d\/"},"modified":"2020-02-10T11:18:20","modified_gmt":"2020-02-10T11:18:20","slug":"microlentilles-transparentes-transformant-leffet-moire-en-images-3d","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/microlentilles-transparentes-transformant-leffet-moire-en-images-3d\/","title":{"rendered":"Microlentilles transparentes transformant l&rsquo;effet moir\u00e9 en images 3D"},"content":{"rendered":"<p><span class=\"tlid-translation translation\" lang=\"fr\">La technologie invisible et peu co\u00fbteuse pourrait trouver des applications non seulement \u00e0 des fins d\u00e9coratives \u00e0 grande \u00e9chelle (sur les fen\u00eatres et les \u00e9l\u00e9ments d\u00e9coratifs sur les b\u00e2timents), mais aussi pour concevoir des marqueurs anti-contrefa\u00e7on. Un moir\u00e9 est l&rsquo;effet optique qui se produit lorsque deux ensembles de lignes ou de grilles sont superpos\u00e9es, consistant en des motifs cr\u00e9\u00e9s \u00e0 partir de l&rsquo;interf\u00e9rence entre les lignes.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Dans un article intitul\u00e9 \u00ab<\/span>\u00ab\u00a0Level-line moir\u00e9s by superposition of cylindrical microlens gratings&nbsp;<span class=\"tlid-translation translation\" lang=\"fr\">\u00bb publi\u00e9 dans le Journal of the Optical Society of America, les chercheurs d\u00e9taillent comment ils ont superpos\u00e9 des r\u00e9seaux de lentilles cylindriques de la m\u00eame p\u00e9riode sur les deux c\u00f4t\u00e9s d&rsquo;un substrat transparent, tout en d\u00e9pla\u00e7ant localement certaines des lentilles cylindriques selon la th\u00e9orie du moir\u00e9 pour cr\u00e9er des motifs mobiles d&rsquo;intensit\u00e9s lumineuses ou de couleurs constantes \u00e0 travers les \u00e9l\u00e9ments graphiques, lorsque le substrat est \u00e9clair\u00e9 par derri\u00e8re.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" alt=\"\" height=\"213\" data-src=\"https:\/\/eenews.cdnartwhere.eu\/sites\/default\/files\/images\/01-picture-library\/eenews\/2020\/led-moire2.jpg\" style=\"--smush-placeholder-width: 320px; --smush-placeholder-aspect-ratio: 320\/213;float:right\" width=\"320\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/> <span class=\"tlid-translation translation\" lang=\"fr\">Cette nouvelle technologie est le r\u00e9sultat d&rsquo;une collaboration entre le Laboratoire des microsyst\u00e8mes de l&rsquo;EPFL (LMIS) et son Laboratoire d&rsquo;image et de repr\u00e9sentation visuelle (IVRL). En utilisant des techniques de microfabrication, les chercheurs commencent avec un substrat plat transparent de chaque c\u00f4t\u00e9 duquel ils gravent un r\u00e9seau complexe de micro-lentilles cylindriques.<\/span><br \/>\n<span class=\"tlid-translation translation\" lang=\"fr\">\u00ab\u00a0Le diam\u00e8tre des microlentilles peut \u00eatre r\u00e9duit \u00e0 cinq microns, ce qui est extr\u00eamement petit\u00a0\u00bb, explique Thomas Walger, Ph.D. \u00e9tudiant qui travaille dans les deux laboratoires. En d\u00e9pla\u00e7ant certaines des lentilles selon un motif pr\u00e9d\u00e9fini par des algorithmes, les chercheurs sont en mesure de contr\u00f4ler l&rsquo;effet de moir\u00e9 r\u00e9sultant de la lumi\u00e8re tombant sur le mat\u00e9riau pour cr\u00e9er des images pr\u00e9cises et coh\u00e9rentes. Le mouvement et les couleurs peuvent \u00eatre cr\u00e9\u00e9s en jouant avec l&rsquo;angle et l&rsquo;intensit\u00e9 de la lumi\u00e8re traversant le substrat.<\/span><\/p>\n<p>Lire aussi:<\/p>\n<p><a href=\"https:\/\/www.electronique-eci.com\/news\/un-systeme-de-vision-stereoscopique-actif-accelere-ladoption-de-la-3d\">Un syst\u00e8me de vision st\u00e9r\u00e9oscopique actif acc\u00e9l\u00e8re l&rsquo;adoption de la 3D<\/a><\/p>\n<p><a href=\"https:\/\/phys.org\/partners\/ecole-polytechnique-federale-de-lausanne\/\">EPFL<\/a> &#8211; <a href=\"http:\/\/www.epfl.ch\/\">www.epfl.ch<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Related articles:<\/strong><\/p>\n<p><a href=\"https:\/\/www.eenewseurope.com\/news\/anti-counterfeiting-markers-merge-photonics-and-ar-nothing-copy\">Anti-counterfeiting markers merge photonics and AR: nothing to copy<\/a><\/p>\n<p><a href=\"https:\/\/www.eenewseurope.com\/news\/colour-microprints-project-multiple-authentication-patterns-under-laser-exposure\">Colour microprints project multiple authentication patterns under laser<\/a><\/p>\n<p><a href=\"https:\/\/www.eenewseurope.com\/news\/3d-micro-optics-top-singled-out-quantum-dots\">3D micro optics on top of singled-out quantum dots<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tirant parti de l&rsquo;effet moir\u00e9 de surfaces de micro-optique savamment superpos\u00e9es, les chercheurs de l&rsquo;Ecole Polytechnique Federale de Lausanne (EPFL) ont d\u00e9velopp\u00e9 une nouvelle fa\u00e7on de cr\u00e9er des images 3D \u00e0 partir de mat\u00e9riaux apparemment transparents.<\/p>\n","protected":false},"author":22,"featured_media":64259,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[913,907],"domains":[47],"ppma_author":[1149],"class_list":["post-64258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-materials-processes-fr","tag-optoelectronics-fr","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Microlentilles transparentes transformant l&#039;effet moir\u00e9 en ima...<\/title>\n<meta name=\"description\" content=\"Tirant parti de l&#039;effet moir\u00e9 de surfaces de micro-optique savamment superpos\u00e9es, les chercheurs de l&#039;Ecole Polytechnique Federale de Lausanne (EPFL) ont...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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