{"id":25855,"date":"2024-12-05T10:27:55","date_gmt":"2024-12-05T09:27:55","guid":{"rendered":"https:\/\/www.ummto.dz\/fs\/?p=25855"},"modified":"2024-12-05T11:07:56","modified_gmt":"2024-12-05T10:07:56","slug":"avis-de-soutenance-de-these-de-doctorat-lmd-de-mlle-djemaiai-lylia","status":"publish","type":"post","link":"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-de-these-de-doctorat-lmd-de-mlle-djemaiai-lylia\/","title":{"rendered":"Avis de soutenance de th\u00e8se de Doctorat LMD de Mlle DJEMAIAI Lylia"},"content":{"rendered":"\n[et_pb_section fb_built=\u00a0\u00bb1″ _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb120%\u00a0\u00bb custom_margin=\u00a0\u00bb|-60px||auto||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_accordion _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb90.1%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_accordion_item title=\u00a0\u00bbSOUTENANCE DE TH\u00c8SE DE DOCTORAT 3EME Cycle LMAVIS DE SD EN PHYSIQUE SP\u00c9CIALIT\u00c9 : MATI\u00c8RE ET RAYONNEMENT DE Mlle. DJEMAIAI Lylia\u00a0\u00bb open=\u00a0\u00bbon\u00a0\u00bb _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb110%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]

Mlle. DJEMAIAI Lylia<\/strong><\/span><\/p>\n

Soutiendra publiquement sa th\u00e8se de Doctorat 3\u00e8me Cycle LMD en Physique<\/p>\n

Intitul\u00e9 :\u00a0\u00ab Mod\u00e9lisation par FDTD de m\u00e9tamat\u00e9riaux di\u00e9lectriques pour le contr\u00f4le et la manipulation de la lumi\u00e8re\u00a0: excitation des SP-BICs et applications. \u00bb<\/strong><\/span><\/p>\n

Le : <\/strong>08 d\u00e9cembre 2024<\/strong><\/span>, \u00e0 la salle de conf\u00e9rences de la facult\u00e9 des sciences de l\u2019Universit\u00e9 Mouloud Mammeri de Tizi-Ouzou, \u00e0 09h00.<\/strong><\/p>\n

Directeur de Th\u00e8se\u00a0<\/span>:<\/span> Pr.<\/span><\/strong> MEZEGHRANE Abdelaziz<\/strong><\/span>\u00a0\u00a0<\/span>\u00a0\u00a0 <\/strong><\/p>\n

Co-directeur de Th\u00e8se\u00a0:<\/span> BELKHIR Abderrahmane<\/span><\/strong><\/p>\n

Devant le jury d\u2019examen suivant\u00a0:<\/u><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n
Nom et Pr\u00e9nom<\/strong><\/td>\n\u00a0Grade<\/strong><\/td>\nLieu d\u2019exercice<\/strong><\/td>\nQualit\u00e9<\/strong><\/td>\n<\/tr>\n
M. \u00a0\u00a0LAMROUS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Omar<\/strong><\/td>\nProfesseur<\/strong><\/td>\nUMMTO<\/strong><\/td>\nPr\u00e9sident<\/strong><\/td>\n<\/tr>\n
M. MEZEGHRANE \u00a0\u00a0\u00a0Abdelaziz<\/strong><\/td>\nProfesseur<\/strong><\/td>\nUMMTO<\/strong><\/td>\nDirecteur de Th\u00e8se<\/strong><\/td>\n<\/tr>\n
M. BELKHIR \u00a0\u00a0Abderrahmane <\/strong><\/td>\nProfesseur<\/strong><\/td>\nUMMTO<\/strong><\/td>\nCo- Directeur de th\u00e8se <\/strong><\/td>\n<\/tr>\n
M. BOUDRIOUA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Azzedine<\/strong><\/td>\nProfesseur<\/strong><\/td>\nU. Sorbonne Paris Nord<\/strong><\/td>\nExaminateur<\/strong><\/td>\n<\/tr>\n
M. FELIDJ\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Nordin <\/strong><\/td>\nProfesseur<\/strong><\/td>\nU. Paris Cit\u00e9<\/strong><\/td>\nExaminateur<\/strong><\/td>\n<\/tr>\n
M. DJOUDER\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Madjid<\/strong><\/td>\nMCA<\/strong><\/td>\nUMMTO<\/strong><\/td>\nExaminateur<\/strong><\/td>\n<\/tr>\n
M. BAIDA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Fadi Issam <\/strong><\/td>\nProfesseur<\/strong><\/td>\nU. Franche -Comt\u00e9<\/strong><\/td>\nInvit\u00e9<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

La communaut\u00e9 universitaire est cordialement invit\u00e9e<\/strong><\/p>\n

T\u00e9l\u00e9charger : Avis de soutenance DJEMAIAI Lylia<\/a><\/span><\/strong><\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=\u00a0\u00bbR\u00e9sum\u00e9\u00a0\u00bb _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb110%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb toggle_text_color=\u00a0\u00bb#E02B20″ open=\u00a0\u00bboff\u00a0\u00bb]

Les r\u00e9seaux di\u00e9lectriques 1D sub-longueur d’onde ne cessent d’exhiber de nouvelles fonctionnalit\u00e9s pour des applications de plus en plus vari\u00e9es en nano-optique. Ils sont notamment utilis\u00e9s dans la d\u00e9tection, en acousto-optique ou pour des applications n\u00e9cessitant une forte exaltation du champ local. En effet, ils sont connus pour leur propri\u00e9t\u00e9 \u00e0 supporter des modes dits \u00e0 sym\u00e9trie prot\u00e9g\u00e9s (SPM pour Symmetry-Protected Modes) qui exhibent en th\u00e9orie un facteur de qualit\u00e9 infini, cependant leur excitation demeure probl\u00e9matique. Une brisure de sym\u00e9trie extrins\u00e8que (en inclinant le faisceau incident) ou intrins\u00e8que (imperfection exp\u00e9rimentale par exemple) permet l’excitation de ces quasi-SPM avec des facteurs de qualit\u00e9 finis mais tr\u00e8s \u00e9lev\u00e9s impliquant une forte exaltation du champ \u00e9lectromagn\u00e9tique local.<\/span><\/p>\n

Une \u00e9tude modale par la m\u00e9thode N-ordre FDTD soutenue par des calculs de transmission FDTD et FMM sur des structures 1D p\u00e9riodiques supportant des modes GMR SP-BIC a permis l\u2019optimisation des param\u00e8tres g\u00e9om\u00e9triques de la structure pour localiser la r\u00e9sonance dans le domaine optique. Le SP-BIC ainsi excit\u00e9 pr\u00e9sente un facteur de qualit\u00e9 de l\u2019ordre de <\/span>10<\/span>4<\/span>. Les valeurs de la sensibilit\u00e9 (S) et de la Figure de M\u00e9rite (FOM) estim\u00e9es s\u2019\u00e9l\u00e8vent \u00e0 <\/span>680<\/span>nm<\/span>RIU<\/span> et <\/span>2\u00d7<\/span>10<\/span>4<\/span> respectivement. Des valeurs quasi-similaires ont \u00e9t\u00e9 obtenues sur un r\u00e9seau finie compos\u00e9e de 200 p\u00e9riodes. Ces propri\u00e9t\u00e9s en font de notre structure un candidat remarquable pour des applications de d\u00e9tection.<\/span><\/p>\n

La caract\u00e9risation optique de notre structure lorsqu\u2019elle est travers\u00e9e par une onde acoustique a \u00e9t\u00e9 r\u00e9alis\u00e9e. Les r\u00e9sultats de simulation montrent que l\u2019excitation du SP-BIC est compl\u00e8tement inhib\u00e9e \u00e0 la moindre d\u00e9formation asym\u00e9trique de notre structure. Ce r\u00e9sultat remarquable permet de concevoir une porte optique logique (ON\/OFF) command\u00e9e par une onde acoustique.<\/span><\/p>\n

La derni\u00e8re partie de cette th\u00e8se a \u00e9t\u00e9 consacr\u00e9e \u00e0 l\u2019impl\u00e9mentation et l\u2019int\u00e9gration de la technique GSTC \u00e0 nos codes FDTD pour une simulation efficiente et optimale des m\u00e9tasurfaces. Ainsi, nous avons r\u00e9ussi \u00e0 canaliser en transmission l\u2019essentiel de l\u2019\u00e9nergie incidente arrivant en incidence normale dans la direction souhait\u00e9e. Nous avons par la suite utilis\u00e9 cette m\u00e9tasurface pour exciter un mode de Bloch d\u2019une structure multicouche (excitable en incidence oblique \u00e0 =37\u00b0) avec une onde plane arrivant en incidence normale. <\/span><\/p>\n

Mots cl\u00e9s :<\/b><\/span> M\u00e9tasurfaces, SP-BIC, N-order FDTD, GSTC-FDTD, FMM.<\/span><\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=\u00a0\u00bbAbstract\u00a0\u00bb open_toggle_text_color=\u00a0\u00bb#E02B20″ _builder_version=\u00a0\u00bb4.27.4″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb119%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb open=\u00a0\u00bboff\u00a0\u00bb]

1D sub-wavelength dielectric networks continue to exhibit new features for increasingly varied applications in nano-optics. They are notably used in detection, acousto-optics, or for applications requiring strong local field enhancement. Indeed, they are known for their ability to support so-called symmetry-protected modes (SPM), which theoretically exhibit an infinite quality factor. However, their excitation remains problematic. Extrinsic symmetry breaking (by tilting the incident beam) or intrinsic symmetry breaking (experimental imperfections, for example) allows the excitation of these quasi-SPMs with finite but very high quality factors, leading to significant local electromagnetic field enhancement.<\/span><\/p>\n

A modal study using the N-order FDTD method supported by FDTD and FMM transmission calculations on 1D periodic structures supporting GMR SP-BIC modes allowed the optimization of the geometric parameters of the structure to locate the resonance in the optical domain. The excited SP-BIC presents a quality factor of the order of 104. The estimated values of sensitivity (S) and Figure of Merit (FOM) are and respectively 680nmRIU and 2\u00d7104. Quasi-similar values were obtained on a finite array composed of 200 periods. <\/span><\/p>\n

These properties make our structure a remarkable candidate for detection applications.<\/span><\/p>\n

The optical characterization of our structure when traversed by an acoustic wave was carried out. Simulation results show that the excitation of the SP-BIC is completely inhibited by the slightest asymmetric deformation of our structure. This remarkable result allows the design of an optical logic gate (ON\/OFF) controlled by an acoustic wave.<\/span><\/p>\n

The last part of this thesis was devoted to the implementation and integration of the GSTC technique into our FDTD codes for efficient and optimal metasurface simulation. Thus, we succeeded in channeling most of the incident energy arriving at normal incidence in the desired direction. We then used this metasurface to excite a Bloch mode of a multilayer structure (excitable at oblique incidence at <\/span>=37\u00b0<\/span>) with a plane wave arriving at normal incidence.\u00a0<\/span><\/p>\n

Keywords :<\/b><\/span>\u00a0 Metasurfaces, SP-BIC, N-order FDTD, GMR, GSTC-FDTD, FMM<\/span><\/p>\n

<\/span><\/p>[\/et_pb_accordion_item][\/et_pb_accordion][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"

Mlle. DJEMAIAI Lylia Soutiendra publiquement sa th\u00e8se de Doctorat 3\u00e8me Cycle LMD en Physique Intitul\u00e9 :\u00a0\u00ab Mod\u00e9lisation par FDTD de m\u00e9tamat\u00e9riaux di\u00e9lectriques pour le contr\u00f4le et la manipulation de la lumi\u00e8re\u00a0: excitation des SP-BICs et applications. \u00bb Le : 08 d\u00e9cembre 2024, \u00e0 la salle de conf\u00e9rences de la facult\u00e9 des sciences de l\u2019Universit\u00e9 Mouloud […]<\/p>\n","protected":false},"author":13,"featured_media":6032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1,13,10,9,19,11],"tags":[],"class_list":["post-25855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","category-actualites-pg","category-new_dep_chimie","category-new_dep_maths","category-new_dep_mi","category-new_dep_physique"],"yoast_head":"\nAvis de soutenance de th\u00e8se de Doctorat LMD de Mlle DJEMAIAI Lylia - 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