Propriétés optiques linéaires et non linéaires des couches mincesde carbone déposées par ablation laser PDF Download
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Author: Jacques Thibodeau
Publisher:
ISBN: 9781392184325
Category :
Languages : fr
Pages :
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Book Description
Author: Jacques Thibodeau
Publisher:
ISBN: 9781392184325
Category :
Languages : fr
Pages :
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Book Description
Author: XAVIER.. DIAZ
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Book Description
LE BUT DE CETTE THESE EST L'ETUDE DES PARAMETRES PHYSIQUES QUI FONT VARIER LES PROPRIETES ELECTRONIQUES ET MECANIQUES DES COUCHES MINCES DE CARBONE AMORPHE (A-C) EVAPOREES PAR LA TECHNIQUE DE DEPOSITION PAR LASER PULSE (PLD). TOUT D'ABORD, ON A FAIT DES EXPERIENCES POUR CONNAITRE LE SYSTEME EXPERIMENTAL: ON A ETUDIE LA COMPOSITION DU MATERIAU EVAPORE ET LA CINETIQUE DE DEPOSITION DES PARTICULES SUR LA SURFACE DE SI (111) 7X7. CETTE DERNIERE A ETE OBSERVE A L'ECHELLE ATOMIQUE AVEC UN MICROSCOPE A EFFET TUNNEL DANS L'ULTRA VIDE. DANS UNE DEUXIEME PARTIE, ON A CARACTERISE LES DEPOTS DE A-C. CES FILMS ONT UNE DENSITE ENTRE 2.45 G/CM#3 ET 2.8 G/CM#3 ET UNE DURETE JUSQU'A 50 GPA. ILS SONT SEMICONDUCTEURS AVEC UN GAP OPTIQUE DE 0.3 EV ET UNE RESISTIVITE ELECTRIQUE DE 10#5 CM. CES PROPRIETES SONT DEGRADEES SI L'ENERGIE CINETIQUE DES PARTICULES EVAPOREES EST DIMINUEE. L'ANALYSE PHYSICO-CHIMIQUE DE CES COUCHES MINCES A ETE FAITE EN UTILISANT LES SPECTROSCOPIES DE PHOTOEMISSION (XPS ET UPS), D'ABSORPTION DES RAYONS X (NEXAFS) ET RAMAN. CETTE ANALYSE REVELE QUE CES COUCHES SONT CONSTITUEES PAR DES ATOMES DE CARBONE HYBRIDES SP#2 ET SP#3. LA PROPORTION DES LIAISONS SP#3 PAR RAPPORT AUX LIAISONS SP#2 EST DE 40% POUR LES COUCHES DURES (45 GPA) ET 25% POUR LES MOINS DURES (22 GPA). LES RESULTATS NEXAFS OBTENUS EN DETECTION D'ELECTRON ET EN FLUORESCENCE SEMBLENT INDIQUER UN GRADIENT DE DENSITE DU MATERIAU, CELLE-CI AUGMENTANT DE LA SURFACE VERS LE VOLUME. FINALEMENT, LA SIMILITUDE OBSERVEE ENTRE LES SPECTRES RAMAN DE FILMS DE A-C AVEC DES DURETES SEMBLABLES MAIS DES GAP OPTIQUES RADICALEMENT DIFFERENTS INDIQUENT QUE LA SPECTROSCOPIE RAMAN EST PLUS SENSIBLE A L'ORGANISATION STRUCTURALE QU'AUX PROPRIETES ELECTRONIQUES DES DEPOTS DE A-C
Author: Zackaria Kaboré
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
"Les couches minces à base de carbone nanostructuré ont été déposées sur un substrat de verre par la technique de déposition par laser pulsé. Cette technique consiste en l'ablation d'une cible (le graphite dans notre cas) par un laser pulsé. L'ensemble cible - substrat est placé dans une chambre à vide. Les couches minces ainsi déposées en utilisant les longueurs d'onde d'émission laser de 1064 nm, 532 nm et 266 nm ont subi plusieurs caractérisations. Les analyses ellipsométriques nous permettent d'estimer l'indice de réfraction complexe ainsi que l'épaisseur de nos couches. Nous constatons que la partie imaginaire de l'indice de réfraction de nos couches élaborées en utilisant les longueurs d'onde d'émission laser de 532 et 1064 nm diminue avec la fluence dans la gamme des basses fluences puis augmente avec la fluence dans la gamme des fluences plus élevées. Au cours de nos travaux, nous essayons de proposer une explication physique de l'évolution de la partie imaginaire de l'indice de réfraction en fonction de la fluence à travers l'étude spectroscopique du plasmagénéré lors de l'ablation laser du graphite." --Extrait du résumé.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: M. Muruganant
Publisher: Springer
ISBN: 9811048193
Category : Technology & Engineering
Languages : en
Pages : 403
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Book Description
This volume comprises the select proceedings of FiMPART 2015. The volume covers advances in major areas of materials research under one umbrella. This volume covers all aspects of materials research, processing, fabrication, structure/property evaluation, applications of ferrous, non-ferrous, ceramic, polymeric materials and composites including biomaterials, materials for energy, fuel cells/hydrogen storage technologies, batteries, super-capacitors, nano-materials for energy and structural applications, aerospace structural metallic materials, bulk metallic glasses and other advanced materials. The book will be useful to researchers, students, and professional working in areas related to materials innovation and applications.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Author: Philostratus (the Athenian)
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070
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Book Description
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
