{"id":56120,"date":"2023-02-06T15:27:56","date_gmt":"2023-02-06T13:27:56","guid":{"rendered":"https:\/\/www.iemn.fr\/articles-temporaires-anglais\/these-r-akiki-surface-phoxonique-aleatoire-2.html"},"modified":"2023-02-06T15:27:56","modified_gmt":"2023-02-06T13:27:56","slug":"these-r-akiki-surface-phoxonique-aleatoire-2","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/theses-2022\/these-r-akiki-surface-phoxonique-aleatoire-2.html","title":{"rendered":"Copy of THESIS : R. AKIKI - Random phoxonic surface (Duplicated)"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_1jix2kog4eyf9\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-56120'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_heading-87fdb69a9e63b0680238f658be2136b7\">\n#top .av-special-heading.av-av_heading-87fdb69a9e63b0680238f658be2136b7{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-av_heading-87fdb69a9e63b0680238f658be2136b7 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-av_heading-87fdb69a9e63b0680238f658be2136b7 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-av_heading-87fdb69a9e63b0680238f658be2136b7 av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : R. AKIKI \u2013 Surface phoxonique al\u00e9atoire <\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-pcsuag-b698dd08966dd2317f86ff97076218d9'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-628129dba2299b2ecd65ebfc92eac29d'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-5  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<p>Le 30 novembre 2022.<\/p>\n<h5>Summary:<\/h5>\n<p>Au d\u00e9but des ann\u00e9es 1990, une nouvelle discipline de la physique est apparue \u00e0 travers l\u2019\u00e9tude des cristaux phononiques. Ce travail s\u2019int\u00e9resse aux cristaux phononiques, cristaux artificiels dont les propri\u00e9t\u00e9s physiques peuvent \u00eatre modul\u00e9es par la nature et\/ou la g\u00e9om\u00e9trie de leurs composants. Ces mat\u00e9riaux ont ainsi permis la manipulation et le contr\u00f4le des ondes \u00e9lastiques avec des structurations d\u2019inclusions dans l\u2019ordre de grandeur de la longueur d\u2019onde excitatrice. Avec les ann\u00e9es 2000, les m\u00e9tamat\u00e9riaux acoustiques ouvrent de nouvelles perspectives, bas\u00e9es sur le concept physique de milieu effectif aux grandes longueurs d\u2019onde. L\u2019origine des m\u00e9tamat\u00e9riaux acoustique s\u2019appuie alors sur le concept physique de la r\u00e9sonance propre des inclusions et offrent ainsi de nouvelles applications comme la r\u00e9fraction n\u00e9gative, le cloaking ou l\u2019hyperfocalisation. Ce travail est une premi\u00e8re approche sur l\u2019effet du d\u00e9sordre dans des m\u00e9tamat\u00e9riaux acoustiques. Pour cela, nous \u00e9tudions une structure de m\u00e9tamat\u00e9riau acoustique form\u00e9e de cylindres sur un substrat semi-infini. Les effets des mat\u00e9riaux et de la g\u00e9om\u00e9trie constitutifs des cylindres et de la surface sur les ondes acoustiques de surface seront \u00e9tudi\u00e9s. Nous \u00e9tudions alors le couplage entre piliers et la possibilit\u00e9 de propagation le long d\u2019une chaine. Nous mettons en \u00e9vidence l\u2019effet de couplage \u00e9lastique entre piliers \u00e0 partir du mode de compression et la possibilit\u00e9 de propagation et de contr\u00f4le des ondes acoustiques dans les milieux sub-longueur d\u2019onde. L\u2019\u00e9tude est \u00e9tendue \u00e0 une surface \u00e0 deux dimensions et une distribution p\u00e9riodique, hyperuniforme et al\u00e9atoire de la position des piliers.<\/p>\n<h5>Abstract:<\/h5>\n<p>In the early 1990s, a new discipline of physics appeared through the study of phononic crystals. This work focuses on phononic crystals, artificial crystals whose physical properties can be modulated by the nature and\/or the geometry of their components. These materials have allowed the manipulation and control of elastic waves with inclusion structures in the order of magnitude of the exciting wavelength. With the 2000\u2019s, acoustic metamaterials open new perspectives, based on the physical concept of effective medium at long wavelengths. The origin of acoustic metamaterials is based on the physical concept of the proper resonance of inclusions and thus offer new applications such as negative refraction, cloaking or hyperfocusing. This work is a first approach on the effect of disorder in acoustic metamaterials. For this purpose, we study an acoustic metamaterial structure formed by cylinders on a semi-infinite substrate. The effects of the constituent materials and geometry of the cylinders and the surface on the surface acoustic waves will be studied. We then study the coupling between pillars and the possibility of propagation along a chain. We highlight the effect of elastic coupling between pillars from the compression mode and the possibility of propagation and control of acoustic waves in sub-wavelength media. The study is extended to a two-dimensional surface and a periodic, hyperuniform and random distribution of the pillar positions.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[316],"tags":[],"class_list":["post-56120","post","type-post","status-publish","format-standard","hentry","category-theses-2022"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/56120","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\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=56120"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/56120\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=56120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=56120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=56120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}