Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"ANDRIY FECHAN"

Modeling of the light scattering process in a planar waveguide with liquid crystal core

Czytaj za darmo! »

The light scattering by the liquid crystals (LC) confocal domain is the subject to the theory of the Rayleigh-Gans scattering. this is a scattering process of particles where a wave-length is equivalent. According to this light scattering theory, p value is the basic parameter which determines the scattering indicatrix and the transparency of the system: ( ) where R is the radius of s[...]

Simulation of magnetically controlled elements for optoelectronic systems on the basis of liquid crystals

  One of the possible ways of cost reduction of optical networking is the use of multimode optical fibers. However, their application is significantly restricted by dispersion phenomena that lead to distortion of information transmission in telecommunication fiber networks. In addition, in fiber networks there is an issue of coordination of connection in fiber systems [1, 3]. One of possible solutions of these problems is the application of phase compensators which can reduce the effect of dispersion phenomena. Molecular models In this work we review the possibility of development of magnetically controlled cells on the basis of liquid crystals for optical fiber systems. Magnetically controlled liquid crystalline element is alight guide with a radial distribution of the director profile. The application of an external magnetic field with a magnetic induction vector directed along the axis of the fiber leads to the formation in the center of the coaxial liquid crystalline fiber an are a with distribution of liquid crystal director field in the direction of applied magnetic field. In order to analyze the possibility of the development of LC structure with necessary characteristics there was carried out a computer simulation of molecular models by the means of GBMOLDD software [4]. Molecular models considered in classicalmechanical level and are described by force fields. Bounding interactions in the molecule as a following form [2]: where, nb - number of bo[...]

Application possibilities of nanoparticles for modification of parameters of liquid crystal materials

  Liquid crystal materials (LCs) are widely used as an optically active media of modern displays and information processing devices. This is due to the high sensitivity of these materials to various external influences and the ability to control their optical properties with the help of external electric and magnetic fields. The modification of the properties of the LCs for use as optically active media is provided mainly through the formation of multicomponent mixtures. However, this way of problem solving is practically exhausted. The introduction into anisotropic medium of objects whose dimensions are commensurate with the range of intermolecular forces and it provides significant changes in all physical parameters of this class of composite materials [1-7] can be perspective method. The aim of research presented in this paper was study of the effect of nanoparticles on the physical parameters of cholesteric liquid crystals: transition voltages, the dielectric anisotropy, the supramolecular helical structure pitch and Franck elastic constants. Application possibilities of nanoparticles for modification of parameters of liquid crystal materials (Możliwości modyfikowania parametrów materiałów ciekłokrystalicznych poprzez domieszkowanie nanocząsteczkami) prof. dr hab. inż. Zenon HOTRA1,2, prof. dr hab. inż. Zinoviy MYKYTYUK2, dr inż. Andriy FECHAN2, dr inż. Orest SUSHYNSKYY2, Olga YASYNOVSKA2, Volo dymy r KOTSUN2, Vasyl LEVENETS2, dr hab. inż. Wlo dzimi erz KALITA, prof. PRz1; dr inż. Grzego rz BŁĄD1 1 Politechnika Rzeszowska, Zakład Systemów Elektronicznych i Telekomunikacyjnych 2 Lviv Polytechnic National University, S. Bandera, Lviv, Ukraine 126 Elektronika 8/2010 Objects of research Nematic matrix 5 CB (4-n-pentyl-4-cyanobiphenyl) with the molecule length of 19,22 Å; Δε=+13,1 (at 288K); Tmelt = 295K; TNI = 308.3K and the nematic matrix 1289 based on cyanophenyl compounds with Δε=9,8 (at 288K), Tm[...]

 Strona 1