{"id":37161,"date":"2019-06-18T16:19:51","date_gmt":"2019-06-18T14:19:51","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=37161"},"modified":"2019-07-22T10:06:41","modified_gmt":"2019-07-22T08:06:41","slug":"soutenance-de-these","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/actualites\/soutenance-de-these.html","title":{"rendered":"Soutenance de Th\u00e8se: Yuxin LI \u2013 Etude de cristaux phononiques \u00e0 base des mat\u00e9riaux micro\/nano structur\u00e9s pour la manipulation des ondes de love"},"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_n1kejjswz2kv\" 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-37161'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-op7ond-8dc6ec6da02637451bcc591404f9dd2d\">\n#top .av-special-heading.av-op7ond-8dc6ec6da02637451bcc591404f9dd2d{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-op7ond-8dc6ec6da02637451bcc591404f9dd2d .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-op7ond-8dc6ec6da02637451bcc591404f9dd2d .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-op7ond-8dc6ec6da02637451bcc591404f9dd2d 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: Etude de cristaux phononiques \u00e0 base des mat\u00e9riaux micro\/nano structur\u00e9s pour la manipulation des ondes de love<\/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-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   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<h5><strong style=\"font-size: 16px;\">Yuxin LIU<\/strong><\/h5>\n<p><strong>Vendredi 12 juillet 2019 \u00e0 10h00<br \/>\n<\/strong>FST &#8211; Centrale Lille, Salle Goubet B08<\/p>\n<\/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-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><strong><span style=\"color: #800000;\">Jury:<\/span><\/strong><\/h5>\n<ul>\n<li>Abdelkrim\u00a0TALBI, Professeur des Universit\u00e9s, Centrale Lille (Directeur de th\u00e8se)<\/li>\n<li>Philippe\u00a0PERNOD, Professeur, Centrale Lille, (Codirecteur de th\u00e8se)<\/li>\n<li>Olivier\u00a0BOU MATAR, Professeur, Centrale Lille (Codirecteur de th\u00e8se)<\/li>\n<li>Corinne\u00a0DEJOUS, Professeure des Universit\u00e9s, Universit\u00e9 de Bordeaux (Rapporteur)<\/li>\n<li>Bernard BONELLO, Directeur de Recherche, CNRS (Rapporteur)<\/li>\n<li>El Houssaine\u00a0EL BOUDOUTI, Professeur, Universit\u00e9 Mohammed I (Examinateur)<\/li>\n<li>Virginie\u00a0BLONDEAU-PATISSIER, Ma\u00eetre de Conf\u00e9rences, Universit\u00e9 de Franche-Comt\u00e9 (Examinateur)<\/li>\n<li>Bahram\u00a0DJAFARI-ROUHANI, Professeur Em\u00e9rite, Universit\u00e9 de Lille (Examinateur)<\/li>\n<\/ul>\n<h5>Summary:<\/h5>\n<p>The control of elastic wave propagation relies mainly on the design of artificial media based on structured materials to achieve advanced engineering of propagation dispersion. During the thesis, the dispersion of the guided horizontal transverse polarisation mode (Love mode) in the SiO2\/Quartz multilayer structure (ST-90\u00b0 cut) was numerically investigated and the resulting applications explored. The properties of phononic crystals based on holes micromachined in the SiO2 layer were studied, as were the interaction mechanisms of this mode with studs deposited on the surface of this guiding layer. In the case of hole-based phononic crystals, we have shown that it is possible to open band gaps, and this property has been exploited in the design of a cavity resonator. The performance of the modes of this resonator is studied as a function of the geometrical parameters characterising the phononic crystal. It is also proposed to study the interaction of the cavity resonator modes with the resonance modes of studs deposited on the surface of the cavity. The geometric parameters of the studs are chosen so that the resonance modes of the studs and the cavity coincide. This results in better confinement of the modes and therefore a drastic improvement in the quality factor of the different modes. We also looked at the interaction between the Love mode and meta-surfaces based on studs deposited on the SiO2 surface. Couplings between pads of identical or different geometries gave rise to various phenomena such as the acoustic analogue of Autler-Townes Splitting (ATS), Fabry-Perot resonance, cavity modes, acoustically induced transparency (AIT) and Fano resonance. The results presented in this study could be used for potential acoustic applications such as signal processing, wave control, metamaterials and biosensors.<\/p>\n<h5>Abstract:<\/h5>\n<p>The control of the propagation of elastic waves relies mainly on the design of artificial medium based on structured materials to obtain an advanced engineering of the dispersion of the propagation. During the thesis, the dispersion of the shear horizontal polarised guided mode (Love mode) in the multilayer SiO2 \/ Quartz structure (90ST-cut) was numerically investigated and the resulting applications were explored. The properties of phononic crystals based on micro-machined holes in the SiO2 layer, as well as the interaction mechanisms of this mode with pillars deposited on the surface of this guiding layer, have been studied. In the case of hole-based phononic crystals we have shown that it is possible to open band gaps, this property has been exploited for the design of a cavity resonator. The performances of the modes of this resonator are studied according to the geometrical parameters characterizing the phononic crystal. It is also proposed to study the interaction of the modes of the cavity resonator with the resonance modes of pillars deposited on the surface of the cavity. The geometric parameters of the pillars are chosen so as to match the resonance modes of the pillars and the cavity. This has the effect of a better confinement of the modes and thus a drastic improvement of the quality factor of the different modes. We also investigated the interaction between the Love mode and meta-surfaces based on pillars deposited on the surface of SiO2. The couplings between pillars of identical or different geometries gave rise to various phenomena like acoustic analogue of Autler-Townes Splitting (ATS), Fabry-Perot resonance, cavity modes, acoustically induced transparency (AIT) and Fano resonance. The results presented in this study could be used for potential acoustic applications such as signal processing, wave control, meta-materials and biosensors.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":37170,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-37161","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37161","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=37161"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37161\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/37170"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=37161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=37161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=37161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}