Дисертації з теми "Composés ternaires – Propriétés optiques"
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Tchounkeu, Magloire. "Etudes des propriétés optiques et physiques de GaN-Al2O3 : caractérisation et effets de contraintes." Montpellier 2, 1998. http://www.theses.fr/1998MON20029.
Sefiani, Saïd. "Caractérisation et élaboration de couches minces d'alliages ternaires amorphes silicium-carbone-germanium par décomposition thermique de molécules organogermanosiliciées." Toulouse, INPT, 1992. http://www.theses.fr/1992INPT062G.
Mabrouk, Salima. "Synthèse par voie colloïdale et étude des propriétés optiques et structurales de nanocristaux ternaires ZnSeS dopés." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0169.
In recent years, ternary QDs have experienced an exponential development thanks to their properties, especially their photoluminescence, which can be controlled not only by their size but also by their composition. As part of this thesis, we developed a new "green" synthesis in aqueous media of ZnSeS-doped ternary QDs and we studied the effect of the variation of the dopant (Mn2+, Cu2+, or Cu2+/Al3+) as well as its localization (in the core or in the shell) on their optical and structural properties. The first part of this work describes the synthesis of ZnSeS:Mn ternary QDs and ZnSeS:Mn/ZnS core/shell using 2-MPA as a ligand. The results obtained show that these nanocrystals can be prepared with quantum yields of 22% and 41%, respectively. These QDs have shown excellent photostability under UV irradiation and can easily be transferred to the organic phase using the hydrophobic octanethiol ligand without altering their optical properties. Subsequently, core/shell ZnSeS/ZnS:Cu/ZnS QDs for which the Cu dopant is introduced into the first shell were prepared using 3-MPA as a ligand. Excellent (photo)stability in the presence of air and oxygen was observed. ZnSeS/ZnS:Cu/ZnS core/shell QDs have a 20% photoluminescence quantum yield and have been used as photoluminescent probes for the detection of Pb2+ ions in aqueous media. A selective extinction of the photoluminescence emission in the presence of Pb2+ ions was observed. Finally, Cu and Al co-doped QDs, ZnSeS/ZnS:Cu/ZnS:Al/ZnS (first shell doped with Cu2+ and second shell doped with Al3+) were prepared. Co-doping allows the improvement of the optical properties, including quantum efficiency (up to 32%) as well as the photoluminescence lifetime of Cu-doped QDs
Juillaguet, Sandrine. "Effets d'interruptions de croissance sur les propriétés optiques des puits quantiques ultra minces GaInAs/InP." Montpellier 2, 1992. http://www.theses.fr/1992MON20218.
Achargui, Nour-Eddine. "Elaboration de ZnSiAs2 par E. P. V. Et E. P. V. O. M : caractérisations optiques et électriques." Montpellier 2, 1991. http://www.theses.fr/1991MON20263.
Aloui, Thamer. "Synthèse et caractérisations d'oxydes de molybdate pour des applications environnementales et/ou énergétiques." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASN003.
Development of green advanced processes for energy production and/or environmental protection is of prime importance. For this purpose, transition metal ternary oxides have been synthesized in the laboratory by a coprecipitation method. These are AMoO4 bifunctional molybdate particles (A = Co, Ni and Cd), of which we have sought to master the key parameters that make it possible to modulate the sizes and or shapes while ensuring reproducibility of the synthesis process. Several characterization techniques (DRX, FTIR, MEB, AFM, EDS) were used to access different characteristic parameters: crystal structure, lattice parameters, the crystallites size and strain. Measurements highlighted differences between the three molybdates concerning the mesh parameters and the existence of micro-stresses (extension or compression) as well as of defects and vacancies. This difference also concerned the surface roughness (mean square height values of a few tens of nanometers) as well as the size (from a hundred nanometers to tens micrometers) and the shape (agglomerated nano-rods for CoMoO4, nano-sheets for NiMoO4 and spheroids for CdMoO4). These features have been used to illustrate the combined multi-scale structural effects on the photo-catalytic performance of AMoO4 ternary systems. Beforehand, the optical properties of these compounds were evaluated by UV-Visible diffuse reflectance spectrophotometry (DRS). The optical band gaps were estimated by fitting the experimental measurements by the Kubelka-Munk model: 2.8, 2.4 and 3.7 eV in the cases of Co, Ni and Cd respectively. The concept of band diagram (EC and EV energy levels), associated with that of electrochemical potential (electronegativity and free energy of electrons), made it possible to establish an energy diagram verifying the adequacy between the potential energies (EC and EV) involved and the redox potentials of the couples H2O/•OH, OH-/•OH et O2/•O2‐ and therefore the potential of these ternary oxides to be efficiently used in the field of photocatalysis.The photo-catalytic tests, carried out on methylene blue (BM) considered as a dye (pollutant) model, were very conclusive with a degradation efficiency, under only one-hour irradiation, of order of 87% with NiMoO4 and of the order of 52% for CoMoO4. For the latter, the simplified model of Langmuir-Hinshelwood, proposed by Vollbrecht was suitable for fitting the experimental data, while it is the pseudo second order Nelson-Yoon model which proved to be the more suitable for nickel. The values of the kinetic constants then being much higher than those estimated from the simplified Langmuir model, sign of higher degradation process speed, in disagreement with other works relating to the same AMoO4 compounds.The reuse of molybdate particles in successive photo-catalytic cycles has shown that the degradation rates of MB under the effect of NiMoO4 remain quite remarkable despite the observed decrease: 80%, 74%, 65% and 55% from the second cycle to the last one. Under identical conditions, CoMoO4, showed a slower decrease in the photo-degradation efficiency: 47% and 46% for the second and third cycles against 52% for the first
Mrad, Maroua. "Nouveaux procédés de synthèse en milieu aqueux de quantum dots ternaires AgInS₂ (AIS) et quaternaires AgInS₂/ZnS (AIZS). Dopage de ces nanocristaux par Ni²⁺ ou Co²⁺. Application à la photocatalyse hétérogène." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0119.
Quantum dots (QDs) have high potential for biological detection, photovoltaics and catalysis due to their unique photophysical properties. The most studied semiconductors contain heavy metals such as cadmium and lead and their fields of application are very limited. As part of this thesis, we developed new aqueous synthesis processes for ternary QDs AgInS₂ and quaternary AgInS₂/ZnS and studied their doping by the Ni(+2) and Co(+2) cations to prepare nanocrystals with fluorescent and magnetic properties. We first optimized the synthesis of AIZS QDs in aqueous media using 3-MPA as ligand and produced nanocrystals with a fluorescence quantum yield of 65%. Then, the doping of these nanocrystals by cations Ni(2+) and Co(2+) was studied. A drop in quantum fluorescence efficiency is observed after doping. The best magnetic properties were observed at low temperature (10 K) and the magnetization values increase with the dopant concentration. The AIZS QDs have been associated with the ZnO nanorods by heterojunction to form a good photocatalyst ZnO/AIZS(10%) which degrades 98% of the Orange II in visible during 90 min under intensity 40 W/cm². This material can be reused, its photocatalytic activity only slightly decreases after 8 cycles (91% photodegradation)
Amanowicz, Michel. "Etude des propriétés de transport galvanomagnétique de composés de neptunium et de plutonium." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10038.
Courtois, Denis. "Contribution à l'étude des propriétés cristallographiques et magnétiques des composés R3(Fe,T')29 (R=terre rare, T'=Ti ou V)." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10247.
Tomey, Lopez Estanislao Pablo. "Contribution à l'étude des propriétés structurales et magnétiques des composés intermétalliques de terre rare RFe10,5Mo1,5 : effets des éléments interstitiels H, C et N." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10245.
Reyes, Heredia José Antonio De Los. "Systèmes ternaires nickel-ruthénium-soufre supportés sur alumine : propriétés catalytiques et caractérisations." Lyon 1, 1991. http://www.theses.fr/1991LYO10121.
Awad, Abdel salam. "Nouveaux composés ternaires à base de magnésium : structure, propriétés de sorption d'hydrogène et propriétés physiques." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0215/document.
A drastic reduction of emissions requires a partial or a full phase-out of fossil fuels and switch to renewable based energy production. Hydrogen appears to be a potential candidate to replace hydrocarbon fuels for producing clean energy. In this context, production and storage of hydrogen is one of the key challenges in developing the hydrogen economy.The objective of this thesis is to produce hydrogen from Mg-based materials using (i) hydrolysis and (ii) microwaves methods.The first aim of this thesis is to elaborate Mg-based materials with good hydrolysis kinetics and high yield of hydrogen generation (i.e. reducing the formation of the passivation layer on magnesium). For this study, we focalize essentially on the effect of various additives (Transition metals, Carbon or Oxides) on the hydrolysis reaction of Mg-based materials. The mixtures were prepared by ball milling. Chloride solution (3.5 wt. % NaCl, i.e. sea water) was used as reaction medium to beneficiate of chloride ions effect. Our strategy, to solve the problems related to the low absorption/desorption kinetics (even at high temperature (i.e. 350°C) of Mg-based materials, is based on microwaves energy application. Our second goal for this thesis is to investigate the dehydriding reaction of magnesium hydride catalyzed by carbon (i.e.MgH2 – C) under microwave irradiations. We have studied the effects of microwaves on the kinetics of hydrogen desorption, the morphology and sorption properties of Mg powder after microwave treatment. On the other hand, we have presented another microwaves application which appears very promising: production of fine titanium powder from titanium hydride
Ammarguellat, Chafika. "Contribution à l'étude des propriétés des composés ternaires intermétalliques de type TM2Si2." Paris 6, 1986. http://www.theses.fr/1986PA066007.
Demange, Valérie. "Seléction, élaboration et caractérisation d'alliages et de couches minces approximants Al-Cr-Fe." Vandoeuvre-les-Nancy, INPL, 2001. http://www.theses.fr/2001INPL568N.
Jean, Bruno. "Propriétés électriques, optiques et électro-optiques du semiconducteur CdIn2 Te4." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10553.
Bouchouit, Karim. "Préparation, caractérisation et propriétés optiques non linéaires de composés semi-organiques." Phd thesis, Université d'Angers, 2008. http://tel.archives-ouvertes.fr/tel-00433814.
Selsane, Mohamed. "Synthèse, caractérisation et étude des propriétés physiques d'une nouvelle famille de composés ternaires de type. ." Paris 6, 1994. http://www.theses.fr/1994PA066819.
Mirambet, François. "Propriétés structurales et physiques de nouveaux stannures ternaires à base d'uranium et d'élément de transition (Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt)." Bordeaux 1, 1993. https://tel.archives-ouvertes.fr/tel-00139024.
Welter, Richard. "Propriétés structurales et magnétiques de siliciures et germaniures ternaires RTX et RT#2X#2 : R=CA, BA, SC, Y, LA et lanthanoides; T=MN et métaux des groupes 8 à 10." Nancy 1, 1994. http://docnum.univ-lorraine.fr/public/SCD_T_1994_0067_WELTER.pdf.
Bouragba, Tarik. "Propriétés optiques de puits quantiques GaInAsN/GaAs." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00688818.
Paccard, Liliane. "Structures et propriétés physiques d'alliages ternaires du diagramme Y-Rh-Si et des composés RM3 Ga2." Lyon 1, 1985. http://www.theses.fr/1985LYO11649.
Vitucci, Francesco Maria. "Propriétés optiques et magnétiques de matériaux multiferroïques : gaFeO3 et LuFe2O4." Thesis, Tours, 2010. http://www.theses.fr/2010TOUR4017/document.
We present a contribution to the study of structural, electronic and magnetic propertiesof multiferroic compounds. These materials – characterized by the coexistence and coupling of different types of long-range orders, such as magnetic and ferroelectic – have recently become a subject of great importance because of their academic interest and their significance for potential applications. In this context we have studied the two compounds GaFeO₃ and LuFe₂O₄. The study involved the use of several techniques : electronic spin resonance (ESR), magnetic measurements by magnetometry and infrared spectroscopy (IR).Local and macroscopic magnetic measurements reveal an anomalous paramagnetic phase in GaFeO3. This is attributed to the existence of short-range magnetic correlations in a wide temperature range above the ordering temperature. On the other hand, the analysis of IR phonon spectra recorded at different temperatures (10 ≤ T ≤ 1000 K) shows that the ordering of magnetic moments does not affect the structural properties of GaFeO₃ For LuFe₂O₄, conversely, the magnetic degrees of freedom are coupled to the structural properties via the charge ordering of Fe³+/Fe²+ ions, as suggested by ESR and IR spectroscopy
Brousse, Elodie. "Modélisation et caractérisation de nouveaux matériaux en couches As2GenTe3+n." Montpellier 2, 1998. http://www.theses.fr/1998MON20163.
Rosso, Giraud-Sauveur Christine. "Elaboration et caractérisation de l'iodate de lithium (LiIO3) pour l'optique guidée." Chambéry, 1995. http://www.theses.fr/1995CHAMS015.
Vernière, Anne. "Etude de siliciures ternaires : élaboration, propriétés structurales et magnétiques." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10213.
Serpaggi, Fabien. "Composés de terres rares à charpente ouverte : synthèse hydrothermale, structure et propriétés optiques." Versailles-St Quentin en Yvelines, 1998. http://www.theses.fr/1998VERS0018.
Fossier-Passaquit, Sandrine. "Métrologie des propriétés optiques de cristaux massifs : étude de LiInS2, matériau optiquement non linéaire pour l'infrarouge moyen." Dijon, 2002. http://www.theses.fr/2002DIJOS011.
Alasmar, Eliane. "Systèmes ternaires à base de magnésium : synthèse, structure, propriétés physiques, stockage et/ou production d’hydrogène." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0023/document.
The use of fossil fuels (non-renewable energy) is responsible for the increase of the concentration of greenhouse gases in the atmosphere. Among the considered alternatives, hydrogen is seen as the most attractive energy vector. Production and storage of hydrogen is one of the key challenges in developing the hydrogen economy.The first objective of this thesis deal with the synthesis and characterization of magnesium-based ternary compounds in the RE-TM-Mg ternary system (with RE = Rare Earth and TM = transition metals) which could be good candidates for hydrogen storage. These compounds could also have other applications than the hydrogen storage in the future such as light structured material. The NdNiMg15 compound has been the subject of a completed study. This phase crystallizes with a tetragonal symmetry (a= 10.0602(1) and c= 7.7612(2) Å and a space group P4/nmm). It showed an antiferromagnetic ordering at 9 K and a reversible hydrogen storage capacity of 4 %mass. This phase exhibited a hardening effect respect to magnesium compound.The second objective of this thesis concerns the hydrogen production by hydrolysis of i) RE-TM-Mg ternary compounds, which could be considered as an economic and energetic possibility to valorize the waste of these compounds and ii) RE-TM-Mg ternary mixtures prepared by ball milling. The grinding creates defects thus promoting the corrosion of the metals. In addition, the hydrogen production by hydrolysis of the Mg-NdNiMg15 composites (70, 80 and 90 %mass. Mg) was carried out and compared with that of the NdNiMg15 compound (64 %mass. Mg). The main corrosion mechanism determined from the electrochemical measurements of the composites is the galvanic corrosion
Busch, Alexandrine. "Synthèse de dérivés de benzo- et pyridodiazines à propriétés optiques non linéaires potentielles." Rouen, INSA, 2005. http://www.theses.fr/2005ISAM0004.
Caye, Florence. "Synthèse et étude de la réactivité de monomères méthacryliques comportant un hétéroatome : étude de leurs propriétés optiques." Metz, 1997. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1997/Caye.Florence.SMZ9760.pdf.
Opticals (thio)methacrylic monomers cotaining heteroatom have been synthesized in this thesis. Various heterocycles and 1,3-dithioacetals derivatives have been introduced in the esterificant chain of the methacrylic system. Refractive index and Abbe number have been measured by using an Abbe refractometer for each compound in order to establish correlation between chemical structur and optical properties. In the third part of this thesis, the reactivity of methacrylic monomers containing sulfur have been studied. We have considered the dethioacetalization of 1,3-dithioacetal acrylic monomers as an entry to a new type of functionalized acrylic monomers. Pummerer reaction has also been studied
Berthebaud, David. "Synthèse, structure cristalline et propriétés électroniques des composés intermétalliques dans les systèmes ternaires (U,Ce)-Fe-(Ge,Si)." Rennes 1, 2007. http://www.theses.fr/2007REN1S089.
This work reports on synthesis, structural characterization of new compounds, and physical properties of new phases from the ternary systems (Ce,U)-Fe-(Ge,Si). These systems have been choosing to discover new heavy fermion compounds, which are characterized by their high values of the Seebeck coefficient. The first part is devoted to the silicides ternary systems. Three new phases have been characterized and found stable at 900°C namely, U₆Fe₁₆Si₇, UFe₅Si₃ and CeFe₁₃-xSix. The second part is devoted to the ternary systems U-Fe-Ge and Ce-Fe-Ge. Experimental work have evidenced new phases: CeFe₆Ge₆, U₃Fe₄Ge₄, UFe₀. ₄Ge₂ U₆Fe₂₂Ge₁₃, U₉Fe₇Ge₂₄ and U₆₈Fe₈-xGe₆₆, the last three being original structure types. Electronics and structural properties from the ternary phases have been studied
Kerbellec, Nicolas. "Polymères de coordination à base de Terres Rares : porosité et propriétés optiques." Rennes, INSA, 2007. http://www.theses.fr/2007ISAR0009.
We have developed a computational method that allows us to estimate the potential porosity of coordination polymers. This method, based only on crystallographic data, leads to a value which does not depend on sample geometry. It is particularly useful for studying coordination polymers with low thermal stability. It is also useful for comparing the potential porosity of materials with complex networks. We have been then interested in the development of lanthanide terephthalate compounds. All these compounds present only two type of crystallographic structure and one of them contains thirteen different lanthanides with the structure Ln2(TER)3(H2O)4. These compounds have been more particularly studied. We have synthesized nanoparticules using polymer encapsulation technique. Then we have worked on a new type of compounds which simultaneously contain several different lanthanides. The synergy between the different lanthanides ions leads to new compounds exhibiting original properties
Archidi, Moulay el Hassane. "Caractérisation du dispositif implanté p+/n à base de Ga0. 96Al0. 04Sb : application aux mesures des coefficients d'ionisation." Montpellier 2, 1990. http://www.theses.fr/1990MON20164.
Andenet, Alemu. "Propriétés optiques du nitrure de gallium épitaxié sur la face A du saphir." Montpellier 2, 1999. http://www.theses.fr/1999MON20086.
Halich, Khalid. "Contribution à la synthèse et à l'étude des propriétés magnétiques de phases intermétalliques RTX et RT2X2 (R = Ca, La et lanthanoi͏̈des, T = métaux de transition, X = métalloi͏̈des) de symétrie quadratique." Université Louis Pasteur (Strasbourg) (1971-2008), 2004. https://publication-theses.unistra.fr/public/theses_doctorat/2004/HALICH_Khalid_2004.pdf.
This thesis gathers data relating to crystal chemistry analysis and magnetic behavior of various new phases adopting the tetragonal crystal structures of CeFeSi, CeScSi and/or ThCr2Si2 type. Magnetic measurements and neutron diffraction permit us to characterize the magnetic behavior of the CeFeSi-type R(Ru1-xFex)Si systems with R= Nd and Pr. An antiferromagnetic - ferromagnetic transition is observed for 0. 6< x <0. 7 in the Nd(Ru1-xFex)Si system and we highlighted the first canted ferromagnetic structure laid in the isotypic compounds of CeFeSi. Other CeFeSi-type solid solution Pr(Ru1-xFex)Si is characterized by an antiferromagnetic order for 0< x <0. 8 with a strong reduction in the magnetic moment of praseodymium when x value increases. Complete study of the magnetic properties of the RZrSb phases with R = Gd-Tm enabled us to determine their magnetic structures which is very influenced by the nature of lanthanoi͏̈d element. Indeed, the structure is ferromagnetic for TbZrSb and purely antiferromagnetic for ErZrSb. We succeeded in structural and magnetic characterization for ThCr2Si2 -type structure RIr2Si2 silicides and the RPd2Ge2 germaniures with R= Nd and Pr. This magnetic study enabled us to determine two new magnetic structure for the NdIr2Si2 and PrPd2Ge2 compounds and to show that the magnetic temperature ordre is higher in the PrIr2Si2 compound (TN = 47K) compared to that observed in the PrPd2Ge2 compound (TN =5K). Finally, we contributed to analyse magnetic behavior of manganese sub-network in the ThCr2Si2 type pseudoternary CaMn2-xTxGe2 (T= Cr, Co, Ni) compounds. The substitution of manganese by chromium and nickel in the CaMn2Ge2 compounds showed the stabilization of the antiferromagnetic coupling Whatever x value, whereas ferromagnetic component appears in the series of CaMn2-xCoxGe2 with increase of x value. The CaMnCoGe2 compound appears completely interesting to technological use for futur investigation, since this compound presents a antiferro-ferromagnetic transition around 325 K
Darracq, Stéphane. "Contribution à l'étude des corrélations entre stœchiométrie, structure, liaison chimique et propriétés physico-chimiques de perovskites oxygénées renfermant un élément 3d à un degré d'oxydation inusuel (Cu(III), Cu(IV), Fe(IV))." Bordeaux 1, 1993. http://www.theses.fr/1993BOR10564.
Couillaud, Samuel. "Synthèse, structure, propriétés physiques et réactivité vis-à-vis de l'hydrogène de nouveaux composés ternaires à base de magnésium." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00649384.
Couillaud, Samuel. "Synthèse, structure, propriétés physiques et réactivité vis-à-vis de l’hydrogène de nouveaux composés ternaires à base de magnésium." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14288/document.
Nowadays, the decrease of fossil fuel resources, and the increase of energy requirements and concentration of greenhouse gases in the atmosphere induces the development of new energies. The use of hydrogen as energetic vector is a solution. Indeed, it is abundant and its combustion is highly energetic (3 times more than petrol). However, its utilisation is limited by problems of production, storage and use. In this work, we have focused on the problem of solid hydrogen storage. It allows for high volumetric capacity (≈ 140 g/L) but is restricted by low weight capacity and by slow sorption kinetics. Because magnesium is potentially a good candidate according to its high weight capacity (7.6 %wt), we have chosen to work on the ternary compounds RE-M-Mg (RE = Rare earth, M = transition metal). The goal was double: to keep the good capacity of the magnesium and to decrease the enthalpy of formation of the hydride. The RE4NiMg system (with RE = Y and Gd) and the derived solid solutions were studied. An irreversible hydrogen uptake of 2.5% wt and a magnetic properties change from antiferromagnetic to spin glass behaviour were observed.A more exploratory work allowed us to discover two new magnesium rich compounds: LaCuMg8 and Gd13Ni9.5Mg77.5. Both lead to a phase mixture induced by their decomposition during the first absorption. This mixture allows a very significant improvement of the hydrogen sorption properties of magnesium
Kany, François. "Étude des propriétés magnéto-optiques d'hétérostructures quantiques à base de semiconducteurs semimagnétiques." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10251.
Almuneau, Guilhem. "Etude et réalisation de lasers à cavité verticale à 1,55 mum sur GaSb." Montpellier 2, 1998. https://tel.archives-ouvertes.fr/tel-00006831.
Essaïdi, Zacaria. "Photo-structuration et propriétés optiques non-linéaires de composés organiques azoïques : azoazulène, azocarbazole et azobenzène." Angers, 2009. http://www.theses.fr/2009ANGE0061.
Organic materials are interesting and promising systems for a wide range of applications : photonic, optoelectronic, optical data storage, electronic, and son on. The unique properties of these organic molecular or polymer systems can be modulated by grafting functional groups so as to target specific functions. Research and development of new photosensitive materials and optically active is hence a major challenge. We treat in this study the photo-ordering and nonlinear optical properties of three families of organic azo-dye compounds ; azo-azulenes, carbazoles and azo-azo-benzenes. These systems are designed by adding a donor group and acceptor group separated by a π-conjugated chain. This association leads to asymmetric distribution of charge and allow large optical nonlinearities. The experimental results obtained by different experimental techniques show quadratic susceptibilities are higher relative to the reference material (quartz), and cubic susceptibilities is in the order of that of the reference (carbon disulfide). We report also the potential of these compounds for formation of surface photo-induced grating. The obtained results in picosecond regime showed the formation of one or two-dimensional periodic structures and a located photostructuration
Julier, Michel. "Etudes optiques de GaN et d'InGaN." Montpellier 2, 1999. http://www.theses.fr/1999MON20099.
Pernot, Paul. "Élaboration et caractérisation de composés binaires et ternaires du graphite avec les chlorures métalliques : Corrélations entre structures et propriétés physiques." Nancy 1, 1989. http://www.theses.fr/1989NAN10236.
Malonga, Frédéric. "Propriétés électroniques et optiques des superréseaux semiconducteurs contraints suivant [001] et [111]." Montpellier 2, 1995. http://www.theses.fr/1995MON20267.
Fkyerat, Abdallah. "Etude de la densité électronique dans un cristal à propriétés optiques non linéaires : le N-(4-nitrophényl)-(L)prolinol." Lille 1, 1993. http://www.theses.fr/1993LIL10083.
En outre, nous avons pu mesurer l'influence des phases des facteurs de structure sur la densité électronique de déformation et les propriétés électrostatiques dans le cas d'une structure non centrosymétrique
Ney, Pascal. "Etude de l'origine des propriétés électrooptiques et optiques non linéaires du métaborate de baryum (β-BaB2O4) par spectroscopie Raman". Metz, 1998. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1998/Ney.Pascal.SMZ9864.pdf.
The work presented in this thesis is devoted to the study of the origin of the electro-optic (EO) and the nonlinear optical (NLO) properties in barium metaborate (β-BBO). A new method for measuring EO coefficients, using a Michelson interferometer, has been developed during the thesis work This method allows to determine the EO coefficients of β-BBO which are used to calculate the ionic contributions. The comparison between the ionic and electronic EO coefficients underlines various behaviours. The microscopic origin of these contributions is analysed by using Raman scattering results as the frequencies and the intensities of the latter vibrations. So, after we have performed an assignment of the Raman vibrations modes of β-BBO, it is possible to link each EO coefficient to a Raman mode. A model is then established which is able to connect the EO coefficient with the properties of the vibrational modes. The various ionic and electronic contributions are estimated from the ratio calculated from the Raman scattering data. The good agreement between the results obtained by EO measurements and those deduced from the vibrational modes demonstrates the validity of the model and at the same time of the method used to estimate the EO coefficients contributions from Raman data. A deeper study allows then to distinguish the motions leading to the appearance of the Raman lines and to detect the mechanism responsible of the EO and NLO effects. So, only the (B3O6)3- rings are concerned by the EO and NLO mechanisms in β-BBO. The anions translations in the plane perpendicular to the optic axis and the rings breathings are the main motions related to the r51 and r22 coefficients. The electronic clouds distortion generated by the distortion of the rings permits to explain the electronic values of r51 and r22
Berkaïne, Nabil. "Propriétés optiques non-linéaires de composés métastables du système TeO2 - Bi2O3 : apports de la chimie quantique." Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/0553a07f-6261-48b5-a299-9696b78cdb0b/blobholder:0/2009LIMO4029.pdf.
This work consisted in the study of non-linear optical properties of orthorhombic metastable phases in the TeO2 rich part of the TeO2 - Bi2O phase diagram. After characterizing the structure of these phases, we focused on the study of their 2nd order non-linear optical properties (NLO) by performing second harmonic generation (SHG) experimental measurements. A surprising variation of the SHG efficiency with TeO2 rate was noted. In order to explain it, the 2nd NLO susceptibility for each TeO2 rate was calculated by applying a theoretical method based on the density functional theory (DFT). Such model was first validated. This method was also applied to α and γ TeO2 crystalline phases and cristobalite SiO2. We evidenced some relationships between the 3rd order NLO properties of tellurites and their structural arrangements (entities connection, tellurium lone pair)
Ali, Benamara Abdelkader. "Dopage du polyacétylène orienté par les alcalins en phase vapeur : propriétés de transport et propriétés optiques." Montpellier 2, 1992. http://www.theses.fr/1992MON20105.
Lacerda, Alex. "Propriétés magnétovolumiques des composés à fermions lourds CeRu2Si2 et CeCu6 à basse température." Grenoble 1, 1990. http://www.theses.fr/1990GRE10129.
Dal, Corso Sylvie. "Contribution à l'étude de systèmes ternaires de chalcogénures de plomb en vue de leur utilisation pour la détection infrarouge." Montpellier 2, 1994. http://www.theses.fr/1994MON20232.