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Partager le résultat de cette recherche Interroger des sources externesÉtude des propriétés magnétiques de structure à cristaux photoniques à base de ferrites / Khadidja Saker
Titre : Étude des propriétés magnétiques de structure à cristaux photoniques à base de ferrites : Application à la détection. Type de document : texte imprimé Auteurs : Khadidja Saker, Auteur ; Touraya Bouchemat, Directeur de thèse ; Mahieddine Lahoubi, Directeur de thèse Mention d'édition : 30/01/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 143 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Electronique: Micro et Nanotechnologies Capteur de champ magnétique magnétite guide d'ondes à cristal magnétophotonique planaire YIG effet Faraday couplage des modes TE-TM fibres à cristal magnétophotoniques Magnetic field sensor Fe3O4 planar magneto-photonic crystal waveguide complete photonic band gap Faraday rotation TE-TM mode coupling conventional
fibers and magneto-photonic crystal fibers مستشعر المجال المغنطيسي المغنتيت دليل الموجة البلورية الممغنطة الضوئية المستوية الألياف البلورية المغناطيسيةIndex. décimale : 621 Electronique Résumé :
This thesis is dedicated to the study and the design of new magnetic structures based on photonic crystals for optical systems. To perform these simulations, three softwares are used, the first is called BandSOLVE, which is based on the plane wave method (PWE), the second is the Fullwave based on the finite time difference method (FDTD) and the last is the BeamPROP, based on the Beam Propagation Method (BPM). In the first part, a magnetic sensor based on a two-dimensional photonic-crystal nanocavity infiltrated by Fe3O4 and a broadband W1 waveguide is presented. In order to improve the performance of the structure, the geometrical parameters such as the size of the cavity, the diameter of the air holes have been optimized. An optimal quality factor of 8655 is obtained for L = 4. Subsequently, the principle of the detection is realized by infiltrating different concentrations of Fe3O4 as well as the various local magnetic field factors. We analyzed the detection properties, based on the properties of the cavity and the number of functional holes. For N = 12 air holes, a sensitivity of 146.97 nm / RIU, a magnetic sensitivity of 20.4 nm and a factor of merit of 22.66 are obtained. The optical properties of this sensor are numerically determined by performing simulations using the finite difference method in the 2D time domain. The combination of these performances makes this device a promising platform for the design and development of magnetic field sensors. The second part of this work concerns the improvement of the magneto-optical properties of optical isolators based on YIG, for this purpose, three concepts have been proposed. The first concept is based on the study of a polarization-independent waveguide based on a planar magneto-photonic crystal of YIG developed on an Al2O3 substrate. First, the width and position of the complete photonic band gap of the waveguide are optimized. Then we studied the influence of gyrotropy on the non-reciprocal properties of the waveguide. The results reveal a Faraday rotation of 6.11 × 104 ° / cm and a modal birefringence of 7 × 10-6. Then, we studied optical fibers, starting with a conventional optical fiber structure, followed by magneto-photonic crystal fibers based on YIG / GGG. In order to obtain a non-reciprocal effect, the coupling of TE-TM modes as well as the magneto-optical properties are studied as a function of the gyrotropy. These results show a remarkable development in the magneto-optical behavior, which helps to improve the performance of optical isolators and make it suitable for non-reciprocal devices.Note de contenu :
Br/-liste des Publications International
Diplôme : Doctorat En ligne : ../theses/electronique/SAK7614.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11450 Étude des propriétés magnétiques de structure à cristaux photoniques à base de ferrites : Application à la détection. [texte imprimé] / Khadidja Saker, Auteur ; Touraya Bouchemat, Directeur de thèse ; Mahieddine Lahoubi, Directeur de thèse . - 30/01/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 143 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Electronique: Micro et Nanotechnologies Capteur de champ magnétique magnétite guide d'ondes à cristal magnétophotonique planaire YIG effet Faraday couplage des modes TE-TM fibres à cristal magnétophotoniques Magnetic field sensor Fe3O4 planar magneto-photonic crystal waveguide complete photonic band gap Faraday rotation TE-TM mode coupling conventional
fibers and magneto-photonic crystal fibers مستشعر المجال المغنطيسي المغنتيت دليل الموجة البلورية الممغنطة الضوئية المستوية الألياف البلورية المغناطيسيةIndex. décimale : 621 Electronique Résumé :
This thesis is dedicated to the study and the design of new magnetic structures based on photonic crystals for optical systems. To perform these simulations, three softwares are used, the first is called BandSOLVE, which is based on the plane wave method (PWE), the second is the Fullwave based on the finite time difference method (FDTD) and the last is the BeamPROP, based on the Beam Propagation Method (BPM). In the first part, a magnetic sensor based on a two-dimensional photonic-crystal nanocavity infiltrated by Fe3O4 and a broadband W1 waveguide is presented. In order to improve the performance of the structure, the geometrical parameters such as the size of the cavity, the diameter of the air holes have been optimized. An optimal quality factor of 8655 is obtained for L = 4. Subsequently, the principle of the detection is realized by infiltrating different concentrations of Fe3O4 as well as the various local magnetic field factors. We analyzed the detection properties, based on the properties of the cavity and the number of functional holes. For N = 12 air holes, a sensitivity of 146.97 nm / RIU, a magnetic sensitivity of 20.4 nm and a factor of merit of 22.66 are obtained. The optical properties of this sensor are numerically determined by performing simulations using the finite difference method in the 2D time domain. The combination of these performances makes this device a promising platform for the design and development of magnetic field sensors. The second part of this work concerns the improvement of the magneto-optical properties of optical isolators based on YIG, for this purpose, three concepts have been proposed. The first concept is based on the study of a polarization-independent waveguide based on a planar magneto-photonic crystal of YIG developed on an Al2O3 substrate. First, the width and position of the complete photonic band gap of the waveguide are optimized. Then we studied the influence of gyrotropy on the non-reciprocal properties of the waveguide. The results reveal a Faraday rotation of 6.11 × 104 ° / cm and a modal birefringence of 7 × 10-6. Then, we studied optical fibers, starting with a conventional optical fiber structure, followed by magneto-photonic crystal fibers based on YIG / GGG. In order to obtain a non-reciprocal effect, the coupling of TE-TM modes as well as the magneto-optical properties are studied as a function of the gyrotropy. These results show a remarkable development in the magneto-optical behavior, which helps to improve the performance of optical isolators and make it suitable for non-reciprocal devices.Note de contenu :
Br/-liste des Publications International
Diplôme : Doctorat En ligne : ../theses/electronique/SAK7614.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11450 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité SAK/7614 SAK/7614 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude des propriétés physiques dans les cristaux magnéto photoniques Type de document : texte imprimé Auteurs : Rachid Deghdak, Auteur ; Mouhamed Bouchemat, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 130 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Guide d'ondes cristal magnéto-photonique bidimensionnel planaire structure Bi:YIG/SiO2 structure BIG/GGG Bande interdite photonique complète Effet Faraday Capteur de champ magnétique sensible 2D MPC slab waveguide Bi:YIG/SiO2 structure BIG/GGG structure Complete
PBG Faraday effect Sensitive magnetic field sensor الدليل الموجة الموجي البلوري المغنطيسو-فوتوني ثنائي الابعاد اللوحي بنية Bi:YIG/SiO2 بنية BIG/GGG الشريط العازل الفوتوني الكامل تأثير فاراداي ،مستشعر مجال مغناطيسي حساسIndex. décimale : 621 Electronique Résumé : This thesis is essentially dedicated to the study of physical properties in magneto-photonic crystals. The aim is to optimize a two-dimensional magneto-photonic crystal slab waveguide structure for producing a sensitive magnetic field sensor. We used two simulation software's that are perfectly suited to the study of structures based on magneto-photonic crystals. BandSOLVE uses the plane wave method (PWE) and BeamPPROP using the beam propagation method (BPM). We studied two types of structures: (Bi:YIG/SiO2) and (BIG/GGG), whose materials are bismuth iron garnet BIG and bismuth substituted yttrium iron garnet Bi:YIG which have very interesting magneto-optical properties. A kind of magnetic field sensor (MFS) using a two-dimensional (2D) magnetic photonic crystal (MPC) slab waveguide as the sensing structure is proposed and investigated numerically. The slab structure is based on bismuth iron garnet (BIG), a well-known magnetic material with effective magneto-optical (MO) properties, sandwiched with gadolinium gallium garnet (GGG) as substrate. The complete photonic band gap (PBG) of the 2D MPC is simulated and optimized for realization of polarization-independent waveguides. The simulation results show that the width and position of the complete PBG depend on the thickness of the BIG slab and the radius of the air holes used in the design. By reducing the lightwave propagation losses and enhancing the mode conversion ratio, increased sensitivity is obtained. Based on the Faraday effect, a good linear relationship is observed between the normalized output light intensity and the magnetic field strength as the gyrotropy parameter g is varied from 0.13 to 0.19, a g-range used as the sensor dynamic range. The remarkable enhancement in sensing performance due to the MO effect makes the designed device suitable for magnetic field sensing. The results are discussed to provide a basis for investigation of 2D MPC slab waveguides based on the same structure, which are of particular interest for development of highly sensitive MFSs.
Diplôme : Doctorat En ligne : ../theses/electronique/DEG7385.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11035 Etude des propriétés physiques dans les cristaux magnéto photoniques [texte imprimé] / Rachid Deghdak, Auteur ; Mouhamed Bouchemat, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 130 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Guide d'ondes cristal magnéto-photonique bidimensionnel planaire structure Bi:YIG/SiO2 structure BIG/GGG Bande interdite photonique complète Effet Faraday Capteur de champ magnétique sensible 2D MPC slab waveguide Bi:YIG/SiO2 structure BIG/GGG structure Complete
PBG Faraday effect Sensitive magnetic field sensor الدليل الموجة الموجي البلوري المغنطيسو-فوتوني ثنائي الابعاد اللوحي بنية Bi:YIG/SiO2 بنية BIG/GGG الشريط العازل الفوتوني الكامل تأثير فاراداي ،مستشعر مجال مغناطيسي حساسIndex. décimale : 621 Electronique Résumé : This thesis is essentially dedicated to the study of physical properties in magneto-photonic crystals. The aim is to optimize a two-dimensional magneto-photonic crystal slab waveguide structure for producing a sensitive magnetic field sensor. We used two simulation software's that are perfectly suited to the study of structures based on magneto-photonic crystals. BandSOLVE uses the plane wave method (PWE) and BeamPPROP using the beam propagation method (BPM). We studied two types of structures: (Bi:YIG/SiO2) and (BIG/GGG), whose materials are bismuth iron garnet BIG and bismuth substituted yttrium iron garnet Bi:YIG which have very interesting magneto-optical properties. A kind of magnetic field sensor (MFS) using a two-dimensional (2D) magnetic photonic crystal (MPC) slab waveguide as the sensing structure is proposed and investigated numerically. The slab structure is based on bismuth iron garnet (BIG), a well-known magnetic material with effective magneto-optical (MO) properties, sandwiched with gadolinium gallium garnet (GGG) as substrate. The complete photonic band gap (PBG) of the 2D MPC is simulated and optimized for realization of polarization-independent waveguides. The simulation results show that the width and position of the complete PBG depend on the thickness of the BIG slab and the radius of the air holes used in the design. By reducing the lightwave propagation losses and enhancing the mode conversion ratio, increased sensitivity is obtained. Based on the Faraday effect, a good linear relationship is observed between the normalized output light intensity and the magnetic field strength as the gyrotropy parameter g is varied from 0.13 to 0.19, a g-range used as the sensor dynamic range. The remarkable enhancement in sensing performance due to the MO effect makes the designed device suitable for magnetic field sensing. The results are discussed to provide a basis for investigation of 2D MPC slab waveguides based on the same structure, which are of particular interest for development of highly sensitive MFSs.
Diplôme : Doctorat En ligne : ../theses/electronique/DEG7385.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11035 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DEG/7385 DEG/7385 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude théorique des propriétés magnéto-optiques de cristaux magnéto photoniques à structure ferrite grenat de bismuth (BIG) Type de document : texte imprimé Auteurs : Hamza Otmani, Auteur ; Mohamed Bouchemat, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 147 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Cristaux magnéto photoniques conversion de modes TE-TM effet faraday isolateur optique Magneto photonic crystals mode conversion TE-TM Faraday Effect optical isolators البلورات المغناطيسية الضوئية تحويل الوضع TE-TM تأثير فاراداي العوازل البصرية Index. décimale : 621 Electronique Résumé : Laser sources are the most important elements in a channel of optical telecommunications.
However these are unstable, and have fluctuations. To overcome this drawback it is necessary to place an optical isolator in the output of the cavity which will eliminate reflections.
Photonic crystals are materials whose optical properties are used to manipulate the light across the wavelength. These crystals are structures whose refractive index varies periodically in one, two or three directions in space.
When combined magneto-optical materials and photonic crystals, it appears the new components based on magneto photonic crystals, which exalt the non-reciprocal effects of the propagation.
This work is a contribution to digital studies magneto photonic crystals, we simulated planar structures of photonic band gap materials we focus on their physical properties such as Bands diagram and Gaps map.
These simulations are designed to check the position of the photonic band gap in the studied structure. Our structure is a planar photonic crystal consisting of a magneto-optical material layer referred to as BIG (bismuth garnet ferrite or called bismuth iron garnet) deposited on a layer of GGG (gadolinium garnet and gallium), in a triangular structure and then for a square structure. We study the optical fibres in BIG material, it begins with a conventional optical fibre structure, and we move to a study of magneto photonic crystal fibre based BIG. It was these simulations to study the mode coupling TE-TM, which is originally identical to the Faraday rotation to obtain a non-reciprocal effect in guided configuration.
By varying the gyrotropy, we observed its effect on the coupling efficiency, and changes in other physical parameters affect the conversion rate TE-TM. The coupling output of TE-TM depends on the birefringence and Faraday rotation, for this we made another simulation to determine the birefringence and consequently to find the Faraday rotation which is the main objective of our work. To perform these simulations we used two software of Rsoft CAD, the first module is called BandSOLVE which is based on the plane wave method (PWE), and the second called BeamPROP, based on the beam propagation method (BPM).
We show a significant increase of the Faraday rotation which improves the performance of the optical isolators.
Diplôme : Doctorat En ligne : ../theses/electronique/OTM6745.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9871 Etude théorique des propriétés magnéto-optiques de cristaux magnéto photoniques à structure ferrite grenat de bismuth (BIG) [texte imprimé] / Hamza Otmani, Auteur ; Mohamed Bouchemat, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 147 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Cristaux magnéto photoniques conversion de modes TE-TM effet faraday isolateur optique Magneto photonic crystals mode conversion TE-TM Faraday Effect optical isolators البلورات المغناطيسية الضوئية تحويل الوضع TE-TM تأثير فاراداي العوازل البصرية Index. décimale : 621 Electronique Résumé : Laser sources are the most important elements in a channel of optical telecommunications.
However these are unstable, and have fluctuations. To overcome this drawback it is necessary to place an optical isolator in the output of the cavity which will eliminate reflections.
Photonic crystals are materials whose optical properties are used to manipulate the light across the wavelength. These crystals are structures whose refractive index varies periodically in one, two or three directions in space.
When combined magneto-optical materials and photonic crystals, it appears the new components based on magneto photonic crystals, which exalt the non-reciprocal effects of the propagation.
This work is a contribution to digital studies magneto photonic crystals, we simulated planar structures of photonic band gap materials we focus on their physical properties such as Bands diagram and Gaps map.
These simulations are designed to check the position of the photonic band gap in the studied structure. Our structure is a planar photonic crystal consisting of a magneto-optical material layer referred to as BIG (bismuth garnet ferrite or called bismuth iron garnet) deposited on a layer of GGG (gadolinium garnet and gallium), in a triangular structure and then for a square structure. We study the optical fibres in BIG material, it begins with a conventional optical fibre structure, and we move to a study of magneto photonic crystal fibre based BIG. It was these simulations to study the mode coupling TE-TM, which is originally identical to the Faraday rotation to obtain a non-reciprocal effect in guided configuration.
By varying the gyrotropy, we observed its effect on the coupling efficiency, and changes in other physical parameters affect the conversion rate TE-TM. The coupling output of TE-TM depends on the birefringence and Faraday rotation, for this we made another simulation to determine the birefringence and consequently to find the Faraday rotation which is the main objective of our work. To perform these simulations we used two software of Rsoft CAD, the first module is called BandSOLVE which is based on the plane wave method (PWE), and the second called BeamPROP, based on the beam propagation method (BPM).
We show a significant increase of the Faraday rotation which improves the performance of the optical isolators.
Diplôme : Doctorat En ligne : ../theses/electronique/OTM6745.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9871 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité OTM/6745 OTM/6745 Thèse Bibliothèque principale Thèses Disponible
