2 edition of Photorefractive studies in liquid crystal films. found in the catalog.
Photorefractive studies in liquid crystal films.
Written in English
Thesis (Ph.D.), Dept. of Physics, University of Toronto
|Contributions||Code, R. F. (supervisor)|
|The Physical Object|
|Number of Pages||133|
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The photorefractive effect in liquid crystals is especially pronounced, and both ferroelectric and nematic liquid crystals have been researched for this purpose, with the former showing special. Freely Suspended Liquid Crystalline Films Andrei A.
Sonin Centre d'Etudes Atomiques de Saclay, France and Institute of Crystallography, Russian Academy of Sciences with a Foreword by Professor Noel Clark University of Colorado, USA This book provides a brief introduction to the physics of liquid crystals and to macroscopic physical parameters characterising freely Cited by: Observation of perhaps the largest nonlinear index change mechanism in aligned methyl red- doped nematic liquid crystal film  has also been reported.
Nematic films under applied dc bias field 77 There is one important difference between liquid crystals and the usual photorefractive materials discussed in other chapters of this by: 1. The nonlinear optical response of polymer dispersed liquid crystal (PDLC) films has been measured with a pump -probe beam technique, using a CW Ar^+ laser (pump) and a.
In this chapter, the photorefractive effect in photoconductive ferroelectric liquid crystal blends is described. A blend of liquid crystals that form chiral smectic C phase and photoconductive compounds shows the photorefractive effect. The ferroelectric liquid crystal blends containing a photoconductive chiral compound were found to exhibit a gain coefficient of over cm-1 Cited by: 3.
A review of the field of photorefractive liquid crystals is presented. The first reports of photorefractive liquid crystals occurred inand the performance of these materials has dramatically improved since that time.
Liquid crystalline materials have proven to be highly versatile, showing photorefractive character under a wide range of conditions.
For example, Cited by: This is a new and greatly revised edition of Professor Chandrasekhar's classic book Liquid Crystals, first published in The subject of liquid crystals has grown into an exciting interdisciplinary research field with important practical applications.
This book presents a systematic and self-contained treatment of the physics of the different types of thermotropic. where E SC is the saturated space charge field and τ g is the grating formation constant.
This equation (11) is valid when T and τ g are much larger than the other time constants involved in the space charge field formation. In most cases this condition is fulfilled when the carrier lifetime τ R is much smaller than τ most common method for enhancing the TWM gain in a. Orientational photorefractive effects in nematic liquid crystal film.
Khoo, IEEE J. Quantum Electronics pp. Nonlinear Liquid Crystal Fiber Structures for Passive Optical Limiting of Short Laser Pulses. Polycrystalline thin films of small molecules hold promise for organic thin-film transistors because of their large charge mobility, but are currently limited by poor film homogeneity and thermal Cited by: In this book, the essential elements of liquid crystal science are introduced and explained from the perspectives of both the chemist and the physicist.; The text begins with an historical account of the discovery of liquid crystals and continues with a description of how different phases are generated and how different molecular architectures Cited by: The LLC films floating on isotropic substrates of a different chemical nature are easier to investigate than biphasic systems.
The temperature gradient is absent, and the parameters of the films can be controlled. Furthermore, the surface tension a at the liquid crystal-isotropic fluid and liquid crystal-air interfaces (- J/m2)s3 is. A series of pure congruent lithium niobate (LiNbO3, Photorefractive studies in liquid crystal films.
book crystals were grown and directly polarized under different electric currents in the growth furnace. Their holographic properties were investigated from the ultraviolet to the visible range. The response time shortened, whereas the diffraction efficiency increased incrementally with the electric by: 1.
Abstract. Photorefractive gratings with high grating resolution were observed in the 20 μm thick low-molar-mass nematic liquid crystal (NLC) cell with a separate photoconductive (PC) poly(N-vinylcarbazole) orientational grating with a Cited by: 8.
This book is intended to capture the essentials of these fundamental breakthroughs and point out new exciting possibilities, while providing the reader a basic overall grounding in liquid crystal optics. This edition of Liquid Crystals, consisting of ten original book chapters that have been completely revised with the addition of the latest.
18 June Applications of photorefractive liquid crystals. Stanislaw Bartkiewicz We used either microcrystals or photochromic molecules which were added to the liquid crystal mixture, alternatively photoaligning polymers or polyvinyl carbazole doped with trinitroflourenone (PVK:TNF) and polyoctylthiophene as photoconducting layers were Author: Stanislaw Bartkiewicz, Jaroslaw Mysliwiec, Andrzej Miniewicz.
Synopsis Liquid crystals combine the material properties of solids with the flow properties of fluids. As such they have provided the foundation for a revolution in low-power, flat-panel display technology (LCDs). In this book, the essential elements of liquid crystal science are introduced /5(2).
Experimental results for convection in a thin horizontal layer of a homeotropically aligned nematic liquid crystal heated from below and in a vertical magnetic field are presented.
A subcritical Hopf bifurcation leads to the convecting state. There is quantitative agreement. What is a liquid crystal. 1 Ordering of anisotropic objects 2 The concept and use of symmetry in liquid crystals 3 Liquid crystal phases formed by rod-like molecules 6 Liquid crystals formed from bownana molecules 21 Liquid crystals formed from disk-shaped molecules 22 Polymeric liquid crystals Novel liquid-cored fiber and liquid crystal film for sensor protection against visible ps-cw lasers.
Iam-Choon Khoo, Michael Wood, Pao Chen, Min-Yi Beam amplification and cleanup with two- and four-wave mixing in photorefractive nematic liquid crystal films. College of Optics and Photonics, University of Central Florida,Orlando, USA Interests: advanced liquid crystal display materials, display devices, and device modeling; electronic laser beam steering and adaptive optics using fast-response spatial light modulators; adaptive liquid crystal and liquid lenses for forveated imaging and zoom lens; bio-inspired tunable optical filters using.
This text covers the fundamental aspects and the recent advances of photorefractive optics. Since there is a huge market potential for developing photorefractive (PR) optic devices for the needs of information infrastructure, the book will provide an intensive background and the state-of-the-art technological applications for these needs: for example, for accessible high-speed CD-ROM, 3.
Books and Book Chapters Organic Thin Films Conference, ACS th National Meeting, Washington, DC, USA, v(pt.2) pp. UU, August “Photorefractive mechanisms in liquid crystal and polymer composites”.
Photorefractive materials are promising candidates for reversible holographic optical storage applications. The photorefractive effect has been studied for years in inorganic crystals[ 4 ][ 5 ] and has quite recently been observed in thin polymer films[ 6 ][ 7 ].Cited by: 4.
Chao, CY, Lo, CR, Liu, YH, Veum, M, Huang, C-C, Surendranath, V & Ho, JT' Calorimetric and optical-reflectivity study of thin free-standing 64COOBC liquid-crystal films ', Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, vol.
pp. Author: C. Chao, C. Lo, Y. Liu, M. Veum, Cheng-Cher Huang, V. Surendranath, J. Recently Viewed. Biomacromolecules. Water-Soluble Poly(ethylenimine)-Based Nitric Oxide Donors: Preparation, Characterization, and Potential Application in Hemodialysis.
The molecular design of photorefractive polymers and organic compounds is discussed, followed by a discussion on optical applications of the photorefractive by: A liquid crystal orientation promoter that contains the chemical compound represented by general formula (I) exhibits sufficient solubility, has a wide range of usable concentrations, and is a material that exhibits superior liquid crystal orientation promoting properties.
[L 1 -L 6 represent single bonds, such as -O- -CO- -COO, and the like; Sp represents a single bond or a C Cited by: 1. The fundamental science and latest applications of liquid crystal technologies. An excellent professional reference and superior upper-level student text, Liquid Crystals, Second Edition is a comprehensive treatment of all the basic principles underlying the unique physical and optical properties of liquid crystals.
Effective medium theory of light scattering in polymer dispersed liquid crystal films. Journal of Physics D: Applied Physics, 31 (14), DOI: //31/14/ offers 1, liquid crystal glass film products. About 17% of these are Decorative Films, 28% are Building Glass.
A wide variety of liquid crystal glass film options are available to you, such as project solution capability, warranty, and after-sale service. Get this from a library.
Macromolecular host-guest complexes: optical, optoelectronic, and photorefractive properties and applications: symposium held April, San Francisco, California, U.S.A. [Samson A Jenekhe;]. The orientation of liquid crystal molecules could be influenced by application of an electric field.
The liquid crystal molecules would orient themselves with their dipoles (permanent or induced) parallel to the field, abonding their previous orientation. Freedericksz Transition. Application. of Liquid CrystalsFile Size: 1MB. NOW UPDATED—THE HIGHLY PRACTICAL GUIDE TO ANALYZING LIQUID CRYSTAL DISPLAYS The subject of liquid crystal displays has vigorously evolved into an exciting interdisciplinary field of research and development, involving optics, materials, and electronics.
Updated to reflect recent advances, the Second Edition of Optics of Liquid Crystal Displays. Diagram of Liquid-Crystal Films The Harvard community has made this article openly available.
Please share how this access benefits you. Your story matters Citation Sirota, E. B., Peter S. Pershan, L. Sorensen, and J. Collett. X-ray and optical studies of the thickness dependence of the phase diagram of liquid-crystal films. Vacuum‐deposited films now replace the familiar ``rubbing'' process in substrate preparation for liquid‐crystal cells.
Films deposited at an angle provide an oriented surface for alignment of nematic liquid crystals far better than the well‐known ``rubbed'' plate.
The oblique deposit causes a film growth in a preferred direction, which results in a ``sympathetic Cited by: A thin-film-transistor liquid-crystal display (TFT LCD) is a variant of a liquid-crystal display (LCD) that uses thin-film-transistor (TFT) technology to improve image qualities such as addressability and contrast.
A TFT LCD is an active matrix LCD, in contrast to passive matrix LCDs or simple, direct-driven [clarification needed] LCDs with a few segments.
Liquid Crystals Liquid crystal mesophases Liquid crystal displays Further Reading Problems and Exercises 5 Colour Due to Scattering Scattering and Extinction Tyndall Blue and Rayleigh Scattering Blue Skies, Red Sunsets Scattering and Polarisation Mie.
Bobrovsky and Natalia I. Boiko --Nonlinear Optical Absorption and Related Phenomena in Liquid Crystals / N. Tabiryan, U. Hrozhyk and H. Margaryan / [et al.] --Synthesis of Triphenylene-Based Discotic Liquid Crystal Monomer Containing Azobenzene Moieties / Sidik Silong, Lutfor Rahman and W.
Wan Yunus / [et al.] --Photorefractive. We have demonstrated an all-optical technique for reversible in-plane and out-of-plane switching of nematic liquid crystal molecules in few micron thick films.
Our method leverages the highly localized electric fields (“hot spots”) and plasmonic heating that are generated in the near-field region of densely packed gold nanoparticle layers optically excited on-resonance with the.
A thin film transistor liquid crystal display (TFT-LCD) is a technology which is used in LCD monitor and television displays. TFT technology can be used to give one of the clearest pictures of any flat screen display and it uses much less electricity than older screens.
AbstractLiquid crystal cells based on lithium niobate substrates have recently been proposed as good candidates for optofluidic devices and for light-induced controlled generation of defects in liquid crystal films.
The peculiarity of these structures lies in the possibility of using the bulk photovoltaic effect of lithium niobate to obtain an optically induced dc field able to affect Cited by: 1.in the liquid crystalline phase defines the director n, which gives the direction of the preferred orientation of the liquid crystal molecules.
In most liquid crystals both directions of the vector n, + n and – n are equivalent. However, for molecules with permanent dipole moments this may not be the case, and the sign of n becomes important.