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Etude Par Diffusion Raman De Nanoparticules Metalliques En Matrice Dielectrique Amorphe
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Book Synopsis Étude par diffusion Raman de nanoparticules métalliques en matrice diélectrique amorphe by : Hervé Portales
Download or read book Étude par diffusion Raman de nanoparticules métalliques en matrice diélectrique amorphe written by Hervé Portales and published by . This book was released on 2001 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse réside notamment dans l'étude par diffusion Raman de la dynamique vibrationnelle de nanoparticules métalliques en matrice. Grâce au couplage des vibrations avec le plasmon de surface des particules (diffusion Raman résonnante), la diffusion est fortement amplifiée, ce qui conduit à un signal très intense au regard de al faible quantité de matière métallique présente dans les films nanocomposites étudiés. Les caractéristiques structurales de ces films diffèrent selon la méthode d'élaboration utilisée : source d'agrégats à vaporisation laser et co-déposition des particules et de la matrice par la technique LECBD, co-pulvérisation ionique du métal et de la matrice, ou encore fabrication de verres dopés. Les spectres Raman basse fréquence sont dominées par la bande correspondant à la diffusion par les quadrupolaires. Dans le cas de l'argent, la position de cette bande varie avec la taille des particules conformément aux prédictions du modèle de la sphère élastique, ainsi qu'avec la longueur d'onde d'excitation, ce qui reflète une sélection en forme des particules diffusant la lumière. Des mesures réalisées dans deux configurations de polarisation des lumières incidente et diffusée confirment cette hypothèse. Un effet de cohérence spatiale sur la diffusion Raman a été mis en évidence en comparant des spectres d'échantillons ayant ou non subis un recuit. L'origine de cet effet est justifiée par quelques considérations théoriques. La diffusion Raman par les vibrations radiales des résultats extérieurs, obtenus par une technique de spectroscopie résolue en temps. Le problème des particules mixtes est aussi abordé à travers l'étude de plusieurs systèmes bimétalliques formant, soit un alliage, comme l'or-argent, soit un "core-shell" lorsqu'il y a ségrégation des deux métaux, comme le suggèrent les mesures effectuées sur des particules d'argent-nickel et d'argent-cobalt. Ce travail de recherche a aussi fait l'objet d'une étude par diffusion haute fréquence sur les échantillons recuits de particules d'argent en matrice de silice. Une bande large, dont le maximum est localisé vers 1000 cm-1, est observée et présente des comportements, vis-à-vis de la taille des particules et de l'excitation, très semblables à ceux de la bande basse fréquence. Une discussion sur l'origine de cette diffusion attribuerait plutôt celle-ci à des excitations de paires électron-trou.
Book Synopsis Handbook of Nanophysics by : Klaus D. Sattler
Download or read book Handbook of Nanophysics written by Klaus D. Sattler and published by CRC Press. This book was released on 2016-04-19 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1990s, nanoparticles and quantum dots began to be used in optical, electronic, and biological applications. Now they are being studied for use in solid-state quantum computation, tumor imaging, and photovoltaics. Handbook of Nanophysics: Nanoparticles and Quantum Dots focuses on the fundamental physics of these nanoscale materials and struct
Book Synopsis Etude de nanoparticules métalliques par Diffusion Raman Exaltée de Surface et champ proche optique by : Laurent Billot
Download or read book Etude de nanoparticules métalliques par Diffusion Raman Exaltée de Surface et champ proche optique written by Laurent Billot and published by . This book was released on 2005 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de cette thèse est d’étudier des nanoparticules d’or par spectroscopie d’extinction, diffusion Raman exaltée de surface (DRES) et champ proche optique. Les mesures d’extinction sur ces particules fabriquées par lithographie électronique ont permis de mettre en évidence l’effet de la forme des particules sur la position de la résonance plasmon. Nous avons également pu mettre en évidence l’existence de modes multipolaires pour des nanoparticules de forme allongée. L’efficacité DRES de ces nanoparticules a été étudiée en déposant différents types de molécules (BPE, rhodamine 6G et acide benzoïque). La dépendance de l’exaltation Raman en fonction de la longueur des nanoparticules a été clairement démontrée et un maximum d’exaltation a été observé pour une longueur spécifique. Pour de tels réseaux de particules, nous avons également montré que l’efficacité DRES des modes multipolaires de plasmon de surface localisés était plus importante que l’exaltation observée pour l’ordre dipolaire. Nous avons également étudié ces nanoparticules métalliques par microscopie optique en champ proche. Lors du fonctionnement du microscope à force atomique (AFM) en mode tapping, nous avons observé la présence d’artefacts d’amplitude corrélés au signal d’erreur dû aux variations de l’amplitude de vibrations de la pointe. Celui-ci se produit pour un mauvais alignement du faisceau d’illumination sur la pointe. Cet artefact peu engendrer la formation d’images optiques n’ayant aucune réalité physique (champ proche). Pour finir nous présentons les premiers résultats sur un nouveau type de pointes appliquées au Raman en champ proche
Book Synopsis Nanoparticules métalliques en matrices vitreuses pour l'amplification Raman by : Éric Nardou
Download or read book Nanoparticules métalliques en matrices vitreuses pour l'amplification Raman written by Éric Nardou and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les fibres optiques utilisées pour le transfert d'information présentent des pertes de signal pendant leur propagation. Ainsi, ces signaux ont besoin d'être régulièrement amplifiés. De nos jours, l'Amplification Raman, basée sur le principe de diffusion Raman stimulée, est une des techniques utilisées pour réaliser ces amplifications. Les nanoparticules de métaux nobles ont des propriétés optiques uniques provenant de l'oscillation collective des électrons lorsqu'elles interagissent avec une onde électromagnétique. Ces particules absorbent fortement le champ électromagnétique à une fréquence appelée fréquence de résonance de plasmon de surface. Ce travail de thèse concerne l'influence des nanoparticules métalliques sur l'amélioration de l'Amplification Raman. Il s'inscrit dans le cadre du projet ANR Fenoptic (2010-2012), réunissant l'entreprise Draka et plusieurs laboratoires français (ICB Dijon, CMCP Paris, LPCML Lyon), qui s'intéressent à l'intégration des nanoparticules de métaux nobles à l'intérieur des fibres optiques afin d'utiliser la résonance de plasmon de surface pour améliorer l'efficacité des amplificateurs optiques. Dans ce travail, différentes sources de nanoparticules métalliques ont été examinées (suspensions, couches, préformes de fibre optique). Les expériences ont porté sur la caractérisation (forme et position du plasmon) de nanoparticules de métaux nobles incluses en matrices vitreuses ainsi que sur des mesures de spectroscopie Raman au travers desquelles le phénomène de Diffusion Raman Exaltée de Surface (SERS) a particulièrement été étudié. Pour la première fois, nous avons mis en évidence l'exaltation du signal Raman d'une matrice vitreuse.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Raman Spectroscopy for Nanomaterials Characterization by : Challa S.S.R. Kumar
Download or read book Raman Spectroscopy for Nanomaterials Characterization written by Challa S.S.R. Kumar and published by Springer Science & Business Media. This book was released on 2012-03-30 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: First volume of a 40-volume series on nanoscience and nanotechnology, edited by the renowned scientist Challa S.S.R. Kumar. This handbook gives a comprehensive overview about Raman spectroscopy for the characterization of nanomaterials. Modern applications and state-of-the-art techniques are covered and make this volume essential reading for research scientists in academia and industry.
Book Synopsis An Introduction To Plasmonics by : Olivier Pluchery
Download or read book An Introduction To Plasmonics written by Olivier Pluchery and published by World Scientific. This book was released on 2023-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant
Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Small Wonders, Endless Frontiers by : National Research Council
Download or read book Small Wonders, Endless Frontiers written by National Research Council and published by National Academies Press. This book was released on 2002-09-10 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale science and technology, often referred to as "nanoscience" or "nanotechnology," are science and engineering enabled by our relatively new ability to manipulate and characterize matter at the level of single atoms and small groups of atoms. This capability is the result of many developments in the last two decades of the 20th century, including inventions of scientific instruments like the scanning tunneling microscope. Using such tools, scientists and engineers have begun controlling the structure and properties of materials and systems at the scale of 10?9 meters, or 1/100,000 the width of a human hair. Scientists and engineers anticipate that nanoscale work will enable the development of materials and systems with dramatic new properties relevant to virtually every sector of the economy, such as medicine, telecommunications, and computers, and to areas of national interest such as homeland security. Indeed, early products based on nanoscale technology have already found their way into the marketplace and into defense applications. In 1996, as the tremendous scientific and economic potential of nanoscale science and technology was beginning to be recognized, a federal interagency working group formed to consider creation of a national nanotechnology initiative (NNI). As a result of this effort, around $1 billion has been directed toward NNI research since the start of FY 2001. At the request of officials in the White House National Economic Council and agencies that are participating in NNI, the National Research Council (NRC) agreed to review the NNI. The Committee for the Review of the National Nanotechnology Initiative was formed by the NRC and asked to consider topics such as the current research portfolio of the NNI, the suitability of federal investments, and interagency coordination efforts in this area.
Book Synopsis Scientific Canadian Mechanics' Magazine and Patent Office Record by : Canada. Patent Office
Download or read book Scientific Canadian Mechanics' Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forest Fire Research by : Universidade de Coimbra
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
