{"id":78821,"date":"2026-10-01T14:50:28","date_gmt":"2026-10-01T12:50:28","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=78821"},"modified":"2026-10-01T14:53:06","modified_gmt":"2026-10-01T12:53:06","slug":"78821","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/a-la-une\/78821.html","title":{"rendered":"Nouh KRAI &#8211; 30\/09\/2026 : &lsquo;\u00c9tats de bord et interface topologiques de vall\u00e9e dans les cristaux phononiques et photoniques&rsquo;"},"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_1hur2jj7xvtwh\" 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-78821'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k5dohoxw-887c5f756a4441561efde979c6759084\">\n#top .av-special-heading.av-k5dohoxw-887c5f756a4441561efde979c6759084{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-k5dohoxw-887c5f756a4441561efde979c6759084 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-k5dohoxw-887c5f756a4441561efde979c6759084 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-k5dohoxw-887c5f756a4441561efde979c6759084 av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : Nouh KRAI &#8211; \u00c9tats de bord et interface topologiques de vall\u00e9e dans les cristaux phononiques et photoniques<\/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-jriy64i8-fd5f2e9d63bf552d6910d12f255eb26e'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-68e036126b913e5028f77311dc66b825\">\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825{\ncolor:#bfbfbf;\nborder-color:#bfbfbf;\n}\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-68e036126b913e5028f77311dc66b825 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='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<p><strong>Nouh KRAI<\/strong><\/p>\n<p>Soutenance : 30 septembre 2026 \u00e0 14h00<strong><br \/>\n<\/strong>Amphith\u00e9\u00e2tre Eug\u00e8ne Constant &#8211; IEMN &#8211; Laboratoire central &#8211; Villeneuve d&rsquo;Ascq<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-26fa44c544b10063385818eda37e027b'   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-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><span style=\"color: #800000;\">Summary:<\/span><\/h5>\n<p>Les isolants topologiques constituent une classe de mat\u00e9riaux p\u00e9riodiques caract\u00e9ris\u00e9s par des propri\u00e9t\u00e9s topologiques intrins\u00e8ques permettant un contr\u00f4le particulier de la propagation des ondes. Initialement d\u00e9velopp\u00e9s dans le contexte des syst\u00e8mes quantiques \u00e9lectroniques, ces concepts ont ensuite \u00e9t\u00e9 transpos\u00e9s \u00e0 des syst\u00e8mes artificiels, notamment les cristaux photoniques et phononiques.<\/p>\n<p>Au cours de cette th\u00e8se, nous avons men\u00e9 une \u00e9tude th\u00e9orique et num\u00e9rique de ces syst\u00e8mes afin d\u2019approfondir la compr\u00e9hension de leurs propri\u00e9t\u00e9s topologiques. Nous nous sommes notamment int\u00e9ress\u00e9s \u00e0 la propagation des modes d\u2019interface topologiques de vall\u00e9e, dans les domaines phononique et photonique, ainsi qu\u2019\u00e0 leur contr\u00f4le et leur manipulation \u00e0 travers des guides d\u2019ondes contenant des d\u00e9fauts.<\/p>\n<p>Nous avons \u00e9galement \u00e9tudi\u00e9 la possibilit\u00e9 de contr\u00f4ler simultan\u00e9ment des modes photoniques et phononiques au sein d\u2019une m\u00eame structure, ouvrant ainsi la voie \u00e0 de nouvelles recherches et \u00e0 des applications potentielles dans des domaines tels que les t\u00e9l\u00e9communications et l\u2019optom\u00e9canique.<\/p>\n<h5><span style=\"color: #800000;\">Abstract:<\/span><\/h5>\n<p>Topological insulators constitute a class of periodic materials characterized by intrinsic topological properties that enable enhanced control over wave propagation. Initially developed in the context of quantum electronic systems, these concepts have subsequently been extended to artificial systems, including photonic and phononic crystals.<\/p>\n<p>During this PhD thesis, we conducted theoretical and numerical studies of these systems to gain a deeper understanding of their topological properties. In particular, we investigated the propagation of valley topological interface modes in both phononic and photonic systems, as well as their control and manipulation using waveguides containing defects.<\/p>\n<p>We also explored the possibility of controlling photonic and phononic modes simultaneously within the same structure. This work opens the way to further research and potential technological applications in fields such as telecommunications and optomechanics.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":71083,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3,8],"tags":[],"class_list":["post-78821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une","category-actualites"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/78821","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=78821"}],"version-history":[{"count":4,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/78821\/revisions"}],"predecessor-version":[{"id":78823,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/78821\/revisions\/78823"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/71083"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=78821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=78821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=78821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}