{"id":72013,"date":"2025-01-30T12:17:53","date_gmt":"2025-01-30T10:17:53","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=72013"},"modified":"2025-02-25T11:54:06","modified_gmt":"2025-02-25T09:54:06","slug":"une-nouvelle-dimension-en-acoustique-picoseconde","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/une-nouvelle-dimension-en-acoustique-picoseconde.html","title":{"rendered":"Une nouvelle dimension en acoustique picoseconde"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9\">\n#top .av-special-heading.av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9{\npadding-bottom:10px;\ncolor:#b50000;\n}\nbody .av-special-heading.av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9 .special-heading-inner-border{\nborder-color:#b50000;\n}\n.av-special-heading.av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-m6j6ipl0-7e2d206e77a0800c9f4e8a36b00d99e9 av-special-heading-h2 custom-color-heading blockquote modern-quote modern-centered  avia-builder-el-0  el_before_av_textblock  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Une nouvelle dimension en acoustique picoseconde<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n<section  class='av_textblock_section av-m6j7q3j8-f0a79c8c993a0bd14946be5da4341769'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-72034 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5.jpg\" alt=\"\" width=\"2000\" height=\"102\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5.jpg 2000w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-300x15.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-1030x53.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-768x39.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-1536x78.jpg 1536w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-18x1.jpg 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-1500x77.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/montage_nanoson5-705x36.jpg 705w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/><\/a><\/p>\n<\/div><\/section>\n<div  class='flex_column av-oycd3h-9310b11ef030ae96b42b55c7bd8b6468 av_one_half  avia-builder-el-2  el_after_av_textblock  el_before_av_one_half  first flex_column_div  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m6j6i7e2-dc5fe49bf194199c51685ae09f0c4698\">\n#top .av_textblock_section.av-m6j6i7e2-dc5fe49bf194199c51685ae09f0c4698 .avia_textblock{\ntext-align:justify;\n}\n<\/style>\n<section  class='av_textblock_section av-m6j6i7e2-dc5fe49bf194199c51685ae09f0c4698'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div id=\"attachment_72029\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-72029\" class=\"wp-image-72029\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2.jpg\" alt=\"\" width=\"500\" height=\"361\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2-300x217.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2-1030x744.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2-768x555.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2-18x12.jpg 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2025\/01\/croquis_arnaud2-705x509.jpg 705w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-72029\" class=\"wp-caption-text\">Acoustique picoseconde dans une couche mince transparente : un film m\u00e9tallique est excit\u00e9 par une impulsion laser femtoseconde, une impulsion acoustique d\u2019ultra-haute fr\u00e9quence traverse la couche et une oscillation est d\u00e9tect\u00e9e. Les deux signaux sont obtenus avec un film standard (courbe noire) et un film inclin\u00e9 (courbe rouge). La transform\u00e9e de Fourier visible \u00e0 droite confirme qu\u2019avec le film inclin\u00e9 deux fr\u00e9quences acoustiques sont d\u00e9tect\u00e9es, les ondes transverse et longitudinale.<\/p><\/div>\n<p><strong><span style=\"color: #006278;\"><a href=\"https:\/\/www.nature.com\/articles\/s41598-024-53082-4\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #ff7b00;\"><span style=\"color: #008080;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mqde7m-c95ffd3c85dc0a6a771b1f41c40fa860\">\n.av_font_icon.av-mqde7m-c95ffd3c85dc0a6a771b1f41c40fa860{\ncolor:#006278;\nborder-color:#006278;\n}\n.av_font_icon.av-mqde7m-c95ffd3c85dc0a6a771b1f41c40fa860 .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-mqde7m-c95ffd3c85dc0a6a771b1f41c40fa860 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue889' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><\/span><\/a>Une \u00e9quipe de l\u2019Institut d\u2019\u00e9lectronique, de micro\u00e9lectronique et de\u00a0nanotechnologie en collaboration avec FEMTO-ST de Besan\u00e7on et le LMI de Lyon (Laboratoire des multimat\u00e9riaux et interfaces) a \u00e9tendu les capacit\u00e9s m\u00e9trologiques de l\u2019acoustique picoseconde. Cette technique laser permet de mesurer les propri\u00e9t\u00e9s \u00e9lastiques des couches minces mais jusque-l\u00e0 uniquement dans la direction perpendiculaire \u00e0 la couche. Gr\u00e2ce \u00e0 une couche m\u00e9tallique faite de colonnes inclin\u00e9es, l\u2019\u00e9lasticit\u00e9 dans le plan devient \u00e9galement accessible.\u00a0 Les r\u00e9sultats sont publi\u00e9s dans la revue\u00a0Applied Physics Letters.<\/span><\/strong><\/p>\n<p>L&rsquo;acoustique picoseconde d\u00e9signe une acoustique ultra-haute fr\u00e9quence qui produit des hypersons (bien au-del\u00e0 des ultrasons), qu&rsquo;on n&rsquo;entend pas plus bien s\u00fbr, mais qui sont tr\u00e8s utiles \u00e0 la mesure de propri\u00e9t\u00e9s de couches minces et autres nanostructures. La technique a vu le jour dans les ann\u00e9es 1980 et a depuis connu un engouement aussi bien dans le monde acad\u00e9mique que dans l\u2019industrie, o\u00f9 elle est utilis\u00e9e pour contr\u00f4ler les microprocesseurs sur les lignes de production. Pour acc\u00e9der au monde des hyper ou encore \u00ab\u00a0nanosons\u00a0\u00bb, pas de micro, ni de transducteur, juste de la lumi\u00e8re laser sous forme de flashs extr\u00eamement brefs, des impulsions femtosecondes.<\/p>\n<\/div><\/section><\/div>\n<div  class='flex_column av-tsystp-ac90398b8538b879ca47dccffe941adc av_one_half  avia-builder-el-5  el_after_av_one_half  avia-builder-el-last  flex_column_div  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m6jcczt7-f8046806a4abff40588d34267132fedb\">\n#top .hr.hr-invisible.av-m6jcczt7-f8046806a4abff40588d34267132fedb{\nheight:80px;\n}\n<\/style>\n<div  class='hr av-m6jcczt7-f8046806a4abff40588d34267132fedb hr-invisible  avia-builder-el-6  el_before_av_textblock  avia-builder-el-first'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m6j6najf-4b93c102b925605a8cdce0f2f786a9b2\">\n#top .av_textblock_section.av-m6j6najf-4b93c102b925605a8cdce0f2f786a9b2 .avia_textblock{\ntext-align:justify;\n}\n<\/style>\n<section  class='av_textblock_section av-m6j6najf-4b93c102b925605a8cdce0f2f786a9b2'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Mais cette technique a une limite intrins\u00e8que : seules certaines ondes acoustiques sont accessibles, les ondes longitudinales. Et c&rsquo;est un probl\u00e8me, car on apprend bien plus de choses sur l&rsquo;\u00e9tat de la mati\u00e8re, quand on mesure la vitesse de plusieurs types d&rsquo;onde (longitudinales et transverses). De nombreux travaux ant\u00e9rieurs avaient montr\u00e9 qu\u2019il est parfois possible de contourner cette limitation, mais toujours dans des configurations d\u2019\u00e9chantillons particuli\u00e8res. Impossible en particulier de g\u00e9n\u00e9raliser \u00e0 des \u00e9chantillons de type couche mince sur silicium, LA g\u00e9om\u00e9trie de base des applications, ces tentatives restaient donc vaines.<\/p>\n<blockquote>\n<p><strong>En utilisant une couche mince m\u00e9tallique d\u00e9pos\u00e9e en colonnes inclin\u00e9es, nous avons montr\u00e9 que n\u2019importe quelle couche transparente sur silicium peut \u00eatre caract\u00e9ris\u00e9e en ondes longitudinales et transverses. La couche inclin\u00e9e agit comme un \u00e9metteur mixte longitudinal\/transverse lorsqu\u2019elle est soumise au laser et l\u2019acoustique picoseconde gagne une nouvelle dimension.<\/strong> Si l\u2019\u00e9tude \u00e9tait initialement d\u00e9di\u00e9e aux couches minces transparentes, silice, nitrure d\u2019aluminium, carbure de silicium, le proc\u00e9d\u00e9 se g\u00e9n\u00e9ralise \u00e0 des couches non transparentes, les couches m\u00e9talliques par exemple. Les applications sont nombreuses car la mesure des propri\u00e9t\u00e9s \u00e9lastiques des couches minces est incontournable dans la conception d\u2019objets technologiques aussi vari\u00e9s que les filtres pour la t\u00e9l\u00e9phonie mobile, les miroirs spatiaux, le verre intelligent\u2026<\/p>\n<\/blockquote>\n<p><strong>References<\/strong><br \/>\n<em>Tilted columnar metal film as transducer of transverse coherent acoustic phonons in Picosecond Acoustics.<\/em><br \/>\n<em> Asma Chargui, Nicolas Martin, Gabriel Ferro, et Arnaud Devos.<\/em><br \/>\n<em> Applied Physics Letters,\u00a08 novembre 2024.<\/em><br \/>\n<a href=\"https:\/\/doi.org\/10.1063\/5.0228331\" target=\"_blank\" rel=\"noopener\"><em> https:\/\/doi.org\/10.1063\/5.0228331<\/em><\/a><br \/>\n<em><a href=\"https:\/\/hal.science\/hal-04774895v1\" target=\"_blank\" rel=\"noopener\">https:\/\/hal.science\/hal-04774895v1<\/a><\/em><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-m6j73job-367cc9634111588a80d23ae1ad07b845'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div><div  class='avia-button-wrap av-rpqvoq-62216f8d0422b5d2931cc59a1713615e-wrap avia-button-left  avia-builder-el-9  avia-builder-el-no-sibling'><a href='mailto:arnaud.devos@iemn.fr'  class='avia-button av-rpqvoq-62216f8d0422b5d2931cc59a1713615e av-link-btn avia-icon_select-yes-left-icon avia-size-light avia-position-left avia-color-silver'   aria-label=\"Arnaud Devos\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >Arnaud Devos<\/span><\/a><\/div><\/div>\n<div><\/div>\n<\/div><\/section><\/p><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-72013","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/72013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=72013"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/72013\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=72013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=72013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=72013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}