{"id":75024,"date":"2025-08-16T08:16:24","date_gmt":"2025-08-16T06:16:24","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=75024"},"modified":"2025-09-23T08:53:46","modified_gmt":"2025-09-23T06:53:46","slug":"these-alexis-melot-17-09-2025-traitement-de-signaux-neuronaux-a-base-de-reseaux-de-neurones-a-decharges-optimises-pour-accelerateurs-neuromorphiques","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/a-la-une\/these-alexis-melot-17-09-2025-traitement-de-signaux-neuronaux-a-base-de-reseaux-de-neurones-a-decharges-optimises-pour-accelerateurs-neuromorphiques.html","title":{"rendered":"THESE : Alexis MELOT &#8211; 17\/09\/2025 &#8211; Traitement de signaux neuronaux \u00e0 base de r\u00e9seaux de neurones \u00e0 d\u00e9charges optimis\u00e9s pour acc\u00e9l\u00e9rateurs neuromorphiques"},"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_17adspxnjh7er\" 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-75024'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k5dohoxw-906f8d851625a8e215745d3216856448\">\n#top .av-special-heading.av-k5dohoxw-906f8d851625a8e215745d3216856448{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-k5dohoxw-906f8d851625a8e215745d3216856448 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-k5dohoxw-906f8d851625a8e215745d3216856448 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-k5dohoxw-906f8d851625a8e215745d3216856448 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 : Alexis MELOT &#8211; 17\/09\/2025 &#8211; Traitement de signaux neuronaux \u00e0 base de r\u00e9seaux de neurones \u00e0 d\u00e9charges optimis\u00e9s pour acc\u00e9l\u00e9rateurs neuromorphiques<\/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-44fe40f13a111d27df33ba3c835a0709\">\n.av_font_icon.av-13ewzjw-44fe40f13a111d27df33ba3c835a0709{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-13ewzjw-44fe40f13a111d27df33ba3c835a0709 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-44fe40f13a111d27df33ba3c835a0709 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<h4><strong>Alexis MELOT<\/strong><\/h4>\n<p>Soutenance : 17 septembre 2025 \u00e0 14h00<strong><br \/>\n<\/strong>IEMN Amphitheatre - Central Laboratory - Villeneuve d'Ascq<\/p>\n<\/div><\/section>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_hr-502af03c65eeef94f9e53b82918eae8d\">\n#top .hr.av-av_hr-502af03c65eeef94f9e53b82918eae8d{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-av_hr-502af03c65eeef94f9e53b82918eae8d .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-av_hr-502af03c65eeef94f9e53b82918eae8d hr-custom  avia-builder-el-5  el_after_av_textblock  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-jtefqx33-26fa44c544b10063385818eda37e027b'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h5><strong><span style=\"color: #800000;\"><span style=\"color: #f16728;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mqde7m-5b0c0995ed306af0497b0057884807b7\">\n.av_font_icon.av-mqde7m-5b0c0995ed306af0497b0057884807b7{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-mqde7m-5b0c0995ed306af0497b0057884807b7 .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-mqde7m-5b0c0995ed306af0497b0057884807b7 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='\ue80b' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><\/span><span style=\"color: #f16728;\">Jury :<\/span><\/strong><\/h5>\n<p data-start=\"757\" data-end=\"798\"><strong><em data-start=\"783\" data-end=\"796\">Rapporteurs :<br \/>\n<\/em><\/strong>Radu Ranta, MCF HDR, CRAN-Univ. Lorraine<br \/>\nSylvain Sa\u00efghi,\u00a0Professeur des Universit\u00e9s, IMS-Univ. Bordeaux<\/p>\n<p data-start=\"983\" data-end=\"999\"><strong><em data-start=\"983\" data-end=\"997\">Examiners :<br \/>\n<\/em><\/strong>Blaise Yvert, Directeur de recherche Inserm, GIN-Univ. Grenoble-Alpes &#8211; <i>en visioconf\u00e9rence<br \/>\n<\/i>Virginie Ho\u00ebl, Professeure des Universit\u00e9s, IEMN-Univ. Lille<br \/>\nR\u00e9jean Fontaine, Professeur, Universit\u00e9 de Sherbrooke (Canada) &#8211;\u00a0<i>en visioconf\u00e9rence\u00a0<\/i><\/p>\n<p><strong><i>Encadrants c\u00f4t\u00e9 fran\u00e7ais :<br \/>\n<\/i><\/strong>Directeur : Pierre Yger,\u00a0Charg\u00e9 de recherche HDR Inserm (LilNCog, Lille)<br \/>\nCo-directeur : Yannick Coffinier, Directeur de recherche CNRS (IEMN)<\/p>\n<p><i><strong>Encadrants c\u00f4t\u00e9 Canadien<\/strong> (Universit\u00e9 de Sherbrooke, LN2) :<br \/>\n<\/i>Directeur de th\u00e8se : Sean Wood, Professeur, Universit\u00e9 de Sherbrooke (Canada) &#8211;\u00a0<i>en visioconf\u00e9rence<br \/>\n<\/i>Co-directeur : Fabien Alibart,\u00a0Charg\u00e9 de recherche HDR CNRS, LN2, Universit\u00e9 de Sherbrooke &#8211;\u00a0<i>en visioconf\u00e9rence<\/i><\/p>\n<h5><strong><span style=\"color: #800000;\"><span style=\"color: #f16728;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mqde7m-2-95c84989509c0f6e8d55e9783714dbb4\">\n.av_font_icon.av-mqde7m-2-95c84989509c0f6e8d55e9783714dbb4{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-mqde7m-2-95c84989509c0f6e8d55e9783714dbb4 .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-mqde7m-2-95c84989509c0f6e8d55e9783714dbb4 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='\ue84c' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><\/span><span style=\"color: #f16728;\">Summary:<\/span><\/strong><\/h5>\n<p>Les communications aux fr\u00e9quences terahertz sont \u00e9tudi\u00e9es dans un contexte de transmissions en espace libre. L\u2019objectif de la th\u00e8se est de proposer une \u00e9tude comparative de diff\u00e9rentes topologies d\u2019\u00e9lectrodes sup\u00e9rieures appliqu\u00e9es aux photodiodes UTC ainsi qu\u2019un module d\u2019int\u00e9gration de ces composants. Ces composants permettent de r\u00e9aliser des liens de communications sans fils aux fr\u00e9quences terahertz. Ce travail pr\u00e9sente une \u00e9tude th\u00e9orique, num\u00e9rique et exp\u00e9rimentale des photodiodes UTC r\u00e9alis\u00e9es. Une \u00e9lectrode sup\u00e9rieure d\u00e9di\u00e9e avec diff\u00e9rents motifs a \u00e9t\u00e9 d\u00e9velopp\u00e9e afin de limiter la d\u00e9pendance \u00e0 la polarisation optique de la structure et d\u2019en augmenter la fiabilit\u00e9 dans un contexte de transmission de donn\u00e9es vid\u00e9os aux fr\u00e9quences terahertz. Un module d\u2019int\u00e9gration d\u00e9di\u00e9, en guide WR-3, pour ces photodiodes, est \u00e9tudi\u00e9 num\u00e9riquement sous le logiciel CST ainsi qu\u2019un package sur antenne et des lignes de transmission au r\u00e9cepteur. Enfin, les liens terahertz r\u00e9alis\u00e9s ont permis d\u2019atteindre des distances jusqu\u2019\u00e0 800 m\u00e8tres en situation de transmission vid\u00e9o 4K en espace libre.<\/p>\n<h5><strong><span style=\"color: #800000;\"><span style=\"color: #f16728;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mqde7m-1-1a4e487971ce6a668ee285547773520b\">\n.av_font_icon.av-mqde7m-1-1a4e487971ce6a668ee285547773520b{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-mqde7m-1-1a4e487971ce6a668ee285547773520b .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-mqde7m-1-1a4e487971ce6a668ee285547773520b 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='\ue84c' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><\/span><\/strong><strong><span style=\"color: #f16728;\">Abstract:<\/span><\/strong><\/h5>\n<p>The terahertz frequency communications are studied in a context of free space transmissions. The objective of this thesis is to propose a comparative study of different topologies of top electrode applied to UTC photodiode and a module for packaging this type of components. Those components permit to produce wireless communications links at terahertz frequencies. This work presents a theoretical, numerical and experimental study of UTC photodiodes. The use of a dedicated top contact and the study of different patterns are developed in order to limit the optical polarization dependence of this structure, in order to increase the reliability in a context of data video transmission at terahertz frequencies. A dedicated WR-3 packaging module for these photodiodes is studied numerically under CST software and package on antennas and lines of transmission are studied in receiver. Finally, the terahertz links permits to reach 800 meters for a wireless transmission of 4K video.<\/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":""},"categories":[3,8,199],"tags":[],"class_list":["post-75024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une","category-actualites","category-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/75024","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=75024"}],"version-history":[{"count":4,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/75024\/revisions"}],"predecessor-version":[{"id":75026,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/75024\/revisions\/75026"}],"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=75024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=75024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=75024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}