2 résultat(s) recherche sur le tag 'Faraday effect'    

Etude théorique des propriétés magnéto-optiques de cristaux magnéto photoniques à structure ferrite grenat de bismuth (BIG) / Hamza Otmani  

Public ISBD 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) Tags : Cristaux magnéto photoniques  conversion de modes TE-TM  effet faraday  isolateur optique  Magneto photonic crystals  mode conversion TE-TM  Faraday Effect  optical isolators  ???????? ??????????? ???????  ????? ????? TE-TM  ????? ???????  ??????? ??????? 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 : pdf Permalink : https://bu.umc.edu.dz/md/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 (Route ain el bey, Algérie) : Université Constantine 1, 2014 . - 147 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : Cristaux magnéto photoniques  conversion de modes TE-TM  effet faraday  isolateur optique  Magneto photonic crystals  mode conversion TE-TM  Faraday Effect  optical isolators  ???????? ??????????? ???????  ????? ????? TE-TM  ????? ???????  ??????? ??????? 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 : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9871

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Etude des propriétés physiques dans les cristaux magnéto photoniques / Rachid Deghdak  

Public ISBD 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) Tags : 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  ?????? ?????? ?????? ??????? ?????????-?????? ????? ??????? ??????  ???? Bi:YIG/SiO2  ???? BIG/GGG  ?????? ?????? ???????? ??????  ????? ???????  ??????? ???? ???????? ???? Index. 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 : pdf Permalink : https://bu.umc.edu.dz/md/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 . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 130 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : 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  ?????? ?????? ?????? ??????? ?????????-?????? ????? ??????? ??????  ???? Bi:YIG/SiO2  ???? BIG/GGG  ?????? ?????? ???????? ??????  ????? ???????  ??????? ???? ???????? ???? Index. 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 : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11035

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