{"id":12206,"date":"2026-06-11T08:52:33","date_gmt":"2026-06-11T06:52:33","guid":{"rendered":"https:\/\/www.institut-foton.eu\/?p=12206"},"modified":"2026-06-11T08:52:34","modified_gmt":"2026-06-11T06:52:34","slug":"these-charikleia-tzimoragka-22-06-2026","status":"publish","type":"post","link":"https:\/\/www.institut-foton.eu\/en\/these-charikleia-tzimoragka-22-06-2026\/","title":{"rendered":"Th\u00e8se &#8211; Charikleia Tzimoragka &#8211; 22\/06\/2026"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat :<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center has-medium-font-size wp-block-paragraph\"><strong>R\u00e9seaux d\u2019antennes \u00e0 photom\u00e9lange pour les communications sans fil t\u00e9rahertz<\/strong><br><\/p>\n\n\n\n<p class=\"has-text-align-center has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-f3e84ce605b5bc3a0d020f02b8d578ab wp-block-paragraph\">Charikleia TZIMORAGKA<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dir.de th\u00e8se : David Gonz\u00e1lez-Ovejero (Charg\u00e9 de researche, HDR, CNRS, IETR UMR 6164, Rennes, France<\/li>\n\n\n\n<li>Co-dir. de th\u00e8se : Mehdi Alouini (Professeur des Universit\u00e9s, FOTON Institut, Rennes, France)<\/li>\n\n\n\n<li>Encadrant : Cyril Paranthoen (Ma\u00eetre de conf\u00e9rences, FOTON Institut, INSA, Rennes, France)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cette soutenance publique aura lieu le mercredi \u00a022 juin 2026\u00a0\u00e0 14h00 \u00e0 l&#8217;amphith\u00e9\u00e2tre du PNRB (Campus de Beaulieu, \u00e0 Rennes)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9sum\u00e9 :&nbsp;<\/strong>Ce manuscrit pr\u00e9sente une approche originale pour l\u2019int\u00e9gration h\u00e9t\u00e9rog\u00e8ne des r\u00e9seaux d\u2019antennes \u00e0 phases en bande D avec des photodiodes UTC. Un r\u00e9seau d\u2019alimentation en shunt-stub bas\u00e9 sur CPW et un sch\u00e9ma de polarisation continue en ligne \u00e0 fente assurent une polarisation inverse stable tout en pr\u00e9servant l\u2019int\u00e9grit\u00e9 des signaux haute fr\u00e9quence, enti\u00e8rement compatible avec la fabrication standard PCB. Deux strat\u00e9gies compl\u00e9mentaires de formation de faisceau sont \u00e9tudi\u00e9es. Une premi\u00e8re ap- proche de formation de faisceau optique utilise des cristaux liquides et des lasers doubles \u00e0 polarisation orthogonale, g\u00e9n\u00e9rant des signaux \u00e9lectroniques phas\u00e9s via photom\u00e9lange, avec verrouillage de phase pour compenser la d\u00e9rive de phase dans le temps. Une approche di\u00e9lectrique exploite des guides d\u2019onde HR-Si et des r\u00e9sonateurs annulaires comme blocs de construction reconfigurables \u00e0 faible perte pour un r\u00e9seau de formation de faisceau de type circuit, d\u00e9montr\u00e9e \u00e0 travers un r\u00e9sonateur en silicium fabriqu\u00e9. Les r\u00e9sultats confirment la faisabilit\u00e9 de l\u2019int\u00e9gration de transmetteurs photoniques avec des r\u00e9seaux d\u2019antennes \u00e0 phases avanc\u00e9s, offrant des solutions \u00e9volutives et \u00e9co\u00e9nerg\u00e9tiques pour les syst\u00e8mes 6G sub-THz. Les perspectives d\u2019am\u00e9lioration de la fabrication, de l\u2019extension des r\u00e9seaux et de la mise en \u0153uvre compl\u00e8te du syst\u00e8me sont \u00e9galement discut\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Title: <\/strong>Photomixing Antenna Arrays for Terahertz Wireless Communications<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Abstract:<\/strong> This manuscript presents an original approach for the heterogeneous integration of D-band phased antenna arrays with UTC photodiodes. A CPW-based shunt-stub feeding network and a slotline DC-biasing scheme provide stable reverse biasing while preserving high-frequency signal integrity, fully compatible with standard PCB fabrication. Two complementary beamforming strategies are investigated. An optical beamforming network using liquid crystals and dual orthogonally polarized lasers, generating phased electronic signals via photomixing, with phase locking to compensate phase drift over time and a dielectric approach employing HR-Si waveguides and ring resonators as reconfigurable, low-loss building blocks for a circuit-type beamforming network, demonstrated through a fabricated silicon resonator. The results confirm the feasibility of integrating photonic transmitters with advanced phased arrays, offering scalable, energy-efficient solutions for sub-THz 6G systems. Perspectives for improved fabrication, array scaling, and full system implementation are also discussed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat : R\u00e9seaux d\u2019antennes \u00e0 photom\u00e9lange pour les communications sans fil t\u00e9rahertz Charikleia TZIMORAGKA Cette soutenance publique aura lieu le mercredi \u00a022 juin 2026\u00a0\u00e0 14h00 \u00e0 l&#8217;amphith\u00e9\u00e2tre du<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[37],"tags":[],"class_list":["post-12206","post","type-post","status-publish","format-standard","hentry","category-agenda"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["fr","en"],"languages":{"fr":{"title":true,"content":true,"excerpt":false},"en":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/12206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/comments?post=12206"}],"version-history":[{"count":2,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/12206\/revisions"}],"predecessor-version":[{"id":12208,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/12206\/revisions\/12208"}],"wp:attachment":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media?parent=12206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/categories?post=12206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/tags?post=12206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}