Download or read book Processus de recombinaison radiative dans des semiconducteurs fortement excit s written by Frank Salvan and published by . This book was released on 1970 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book EMISSION STIMULEE ET GAIN OPTIQUE DE SEMICONDUCTEURS A LARGE BANDE INTERDITE DIRECTE ZNS ZNSE ET GAN written by DRISS.. GUENNAN and published by . This book was released on 1998 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE TRAVAIL PRESENTE DANS CETTE THESE A POUR OBJET INITIAL LA CARACTERISATION DE COUCHES SEMICONDUCTRICES EPITAXIEES DE ZNS, ZNSE ET GAN PAR LA MESURE DE LEURS PROPRIETES OPTIQUES LINEAIRES AU VOISINAGE DE LEURS RESONANCES EXCITONIQUES (MESURE DES SPECTRES DE PHOTOLUMINESCENCE, DE REFLECTION ET D'ABSORPTION DES COUCHES). LEURS PROPRIETES OPTIQUES NONLINEAIRES, NOTAMMENT LEURS PHOTOLUMINESCENCES SOUS FORTE EXCITATION LUMINEUSE ET LEURS SPECTRES D'EXCITATION, ONT ETE ETUDIEES ENSUITE. DES PROCESSUS TELS QUE LA RECOMBINAISON RADIATIVE DE MOLECULES EXCITONIQUES (ZNS), DES EXCITONS PAR COLLISIONS EXCITON-EXCITON, EXCITON-ELECTRON (ZNSE), DE PLASMAS ELECTRON-TROU (GAN) ONT ETE MIS EN EVIDENCE DANS CES CONDITIONS D'EXCITATION. LES EMISSIONS STIMULEES OBSERVEES DANS CES COUCHES ET LES GAINS OPTIQUES CORRESPONDANTS ONT ETE ETUDIES GRACE A LA METHODE DE SHAKLEE PAR VARIATION DE LA LONGUEUR DE LA ZONE D'EXCITATION, A DIFFERENTES DENSITES D'EXCITATION ET A DIFFERENTES TEMPERATURES. LES MECANISMES DE GAIN ONT ETE DETERMINES AUX TRES BASSES TEMPERATURES. NOUS AVONS MONTRE QUE, DANS ZNS (30 CM#-#1), L'EMISSION STIMULEE EST SURTOUT DUE A LA RECOMBINAISON RADIATIVE DES MOLECULES EXCITONIQUES ; QUE, DANS ZNSE (90 CM#-#1), LES COLLISIONS EXCITON-EXCITON JOUENT UN ROLE IMPORTANT ; QUE, DANS GAN (450 CM#-#1), LE PROCESSUS QUI INTERVIENT EST LA RECOMBINAISON RADIATIVE D'UN PLASMA ELECTRON-TROU ; ENFIN, QUE, DANS UN PUITS QUANTIQUE DE ZNCDSE/ZNSE PLACE DANS UNE STRUCTURE GRINSCH (650 CM#-#1), L'EMISSION STIMULEE PEUT ETRE EXPLIQUEE PAR UN ELARGISSEMENT INHOMOGENE DES TRANSITIONS EXCITONIQUES DU AUX FLUCTUATIONS DE COMPOSITION DE L'ALLIAGE ET AUX VARIATIONS ALEATOIRES DE L'EPAISSEUR DU PUITS, COMME SUGGERE PAR DING. EN CONCLUSION, DANS CE TRAVAIL, NOUS MONTRONS QU'IL EST POSSIBLE DE CARACTERISER DES COUCHES SEMICONDUCTRICES PAR LA MESURE DE LEURS PROPRIETES OPTIQUES LINEAIRES ET NONLINEAIRES. IL CONTRIBUE AINSI A L'AMELIORATION DES METHODES DE CROISSANCE DE CES COUCHES MINCES SEMICONDUCTRICES.

Download or read book Recombinaison radiative dans les semiconductors written by and published by . This book was released on 1965 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Optical Properties Of Graphene written by Rolf Binder and published by World Scientific. This book was released on 2016-11-11 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.

Download or read book Color Television Receivers written by and published by . This book was released on 1978 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the President on investigation no. 332-95 under section 332 of the Tariff Act of 1930, as amended.

Download or read book TOF Range Imaging Cameras written by Fabio Remondino and published by Springer Science & Business Media. This book was released on 2013-04-09 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today the cost of solid-state two-dimensional imagers has dramatically dropped, introducing low cost systems on the market suitable for a variety of applications, including both industrial and consumer products. However, these systems can capture only a two-dimensional projection (2D), or intensity map, of the scene under observation, losing a variable of paramount importance, i.e., the arrival time of the impinging photons. Time-Of-Flight (TOF) Range-Imaging (TOF) is an emerging sensor technology able to deliver, at the same time, depth and intensity maps of the scene under observation. Featuring different sensor resolutions, RIM cameras serve a wide community with a lot of applications like monitoring, architecture, life sciences, robotics, etc. This book will bring together experts from the sensor and metrology side in order to collect the state-of-art researchers in these fields working with RIM cameras. All the aspects in the acquisition and processing chain will be addressed, from recent updates concerning the photo-detectors, to the analysis of the calibration techniques, giving also a perspective onto new applications domains.

Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

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.

Download or read book Microdosimetry written by Lennart Lindborg and published by CRC Press. This book was released on 2020-10-02 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental microdosimetry deals with the measurement of charged particle energy deposition in tissue equivalent volumes, ranging in size from nanometres to micrometres. Microdosimetry is employed to improve our understanding of the relationship between radiation energy deposition, the resulting biological effects, and the appropriate quantities to be used in characterizing and quantifying radiation quality. Although many reviews and contributions to the field have been published over the past fifty years, this new book is the first to provide a single, up to date, and easily accessible account of experimental microdosimetry. This book is designed to be used in medical, radiation, and health physics courses and by Master's and PhD students. In addition to serving as an introductory text to the field for graduate students, this book will also be of interest as a teaching and reference resource for graduate supervisors and established researchers. Drs. Lennart Lindborg and Anthony Waker have spent a life-time career in experimental microdosimetry research in academic, industrial and regulatory environments and have observed the development of the field from its early days as a recognized discipline; they bring to this book particular knowledge and experience in the design, construction, operation and use of tissue equivalent gas ionization counters and chambers.

Download or read book Preparative Methods of Polymer Chemistry written by Wayne Richard Sorenson and published by . This book was released on 1968 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Photodiodes written by Gian-Franco Dalla Betta and published by BoD – Books on Demand. This book was released on 2011-03-22 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photodiodes, the simplest but most versatile optoelectronic devices, are currently used in a variety of applications, including vision systems, optical interconnects, optical storage systems, photometry, particle physics, medical imaging, etc. Advances in Photodiodes addresses the state-of-the-art, latest developments and new trends in the field, covering theoretical aspects, design and simulation issues, processing techniques, experimental results, and applications. Written by internationally renowned experts, with contributions from universities, research institutes and industries, the book is a valuable reference tool for students, scientists, engineers, and researchers.

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.

Download or read book Industrial Uses of Large Radiation Sources written by International Atomic Energy Agency and published by . This book was released on 1963 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: