Download or read book Contribution la r alisation de fonctions optiques base de cristaux photoniques sur LiNbO3 written by Sandrine Massy and published by . This book was released on 2004 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude démontre la faisabilité de composants dédiés aux télécommunications optiques par gravure d'une structure à Bande Interdite Photonique (BIP) bidimensionnelle dans le niobate de lithium avec guide protonique. Un bombardement électronique, issu d'un Microscope Electronique à Balayage (MEB), associé à une attaque chimique permet d'obtenir des réseaux de tiges ou de trous dans le matériau. Le processus physique à la base de la création des tiges est l'inversion des domaines ferroélectriques du cristal. L'influence des paramètres expérimentaux de preparation et d'irradiation de l'échantillon est étudiée. Des tiges et des trous de, respectivement, 1 æm et 400 nm de diamètre sont obtenus. Des simulations ont permis de déterminer les dimensions du réseau nécessaires à l'obtention d'un filtre à ? = 1,55 æm. La structure ainsi réalisée expérimentalement et caractérisée optiquement montre un comportement sélectif en longueur d'onde autour de 1,55 æm

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 Experimental Chaos written by Stefano Boccaletti and published by A I P Press. This book was released on 2004-12-14 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.

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.