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One dimensional model of dye-doped nematic layer for holography

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EN
Abstrakty
EN
The layer of electrically conducting nematic liquid crystal doped with photosensitive dye and confined between polyimide coated electrodes can serve as a diffraction grating. In this paper, the deformations of the nematic director field induced in such a system by external voltage were studied numerically by means of one-dimensional model. The dissociation and recombination of ions were taken into account according to weak electrolyte model. The director orientation in the deformed layers and the distributions of the electric field and of the ion concentrations were calculated for blocking and for conducting electrodes. The effective extraordinary refractive index was also determined as a function of average ion concentration.
Twórcy
autor
autor
  • Institute of Physics, Technical University of Łódź, 219 Wólczańska Str., 93-005 Łódź, Poland, gderfel@p.lodz.pl
Bibliografia
  • 1. I.C. Khoo, Liquid Crystals Physical Properties and Nonlinear Optical Phenomena, Wiley, New York, 1995.
  • 2. I. Marrucci and Y.R. Shen, "Nonlinear optics of liquid crystals", in The Optics of Thermotropic Liquid Crystals, Chapter 6, p. 115, edited by S. Elston and R. Sambles, Taylor & Francis, London, 1998.
  • 3. L.M. Blinov and V.G. Chigrinov, Electro-optic Effects in Liquid Crystal Materials, Springer Verlag, New York, 1993.
  • 4. I. Janossy and A.D. Lloyd, "Low-power reorientation in dyed nematics., Mol. Cryst. Liq. Cryst. 203, 77 (1991).
  • 5. I.C. Khoo, "Optical dc-field induced space charge fields and photorefractive-like holographic grating formation in nematic liquid crystals", Mol. Cryst. Liq. Cryst. 282, 53-66 (1996).
  • 6. E.V. Rudenko and A.V. Sukhov, "Optically induced spatial charge separation in nematic and the resultant orientational nonlinearity", JETP 78, 875-882 (1994).
  • 7. S. Bartkiewicz and A. Miniewicz, "Mechanism of optical recording in doped liquid crystals", Adv. Mater. Opt. Electron. 6, 219-224 (1996).
  • 8. A. Miniewicz, J. Parka, S. Bartkiewicz, and A. Januszko, "Liquid crystals as materials for real time holographic optical device", Pure Appl. Opt. 7, 179-189 (1998).
  • 9. A. Miniewicz, S. Bartkiewicz, A. Januszko, and J. Parka, "Dye-doped liquid crystal composite for real-time holography: nematic reorientation induced by photoconductivity", in Photoactive Organic Materials Science and Application, NATO ASI Series, Vol. 3/9, pp. 487-496, edited by F. Kajzar, V.M. Agranovich, and C.Y.C. Lee, Kluwer Academic, Dordrecht, 1996.
  • 10. J. Parka, A. Miniewicz, A. Januszko, Y. Reznikov, R. Dąbrowski, and Z. Stolarz, "Influence of nematic liquid crystal with dye and cell construction parameters on dynamic holographic grating formation", Proc. SPIE 4147, 335-339 (2000).
  • 11. H. Naito, M. Okuda, and A. Sugimura, "Transient discharging processes in nematic liquid crystals", Phys. Rev. A44, R3434-R3437 (1991).
  • 12. S. Naemura, Y. Nakazono, K. Nishikawa, A. Sawada, P. Kirsch, M. Bremer, and K. Tarumi, "Structure of ions in liquid-crystalline materials", Mat. Res. Soc. Symp. Proc. 508, 235-240 (1998).
  • 13. G. Derfel and A. Lipiński, "Charge carrier mobility measurements in nematic liquid crystals", Mol. Cryst. Liq. Cryst. 55, 89-99 (1979).
  • 14. G. Briere, F. Gaspard, and R. Herino, "Cinetique de dissociation et relaxation de conduction ionique en phase liquide", J. Chim. Phys. 68, 845 (1971).
  • 15. H. de Vleeschouwer, A. Verschueren, F. Bougriona, R. Van Asselt, E. Alexander, S. Vermael, K. Neyts, and H. Pauwels, "Long-term ion transport in nematic liquid crystal displays", Jpn. J. Appl. Phys. 40, 3272-3276 (2001).
  • 16. L. Onsager, "Deviations from Ohm's law in weak electrolytes", J. Chem. Phys. 2, 599-615 (1934).
  • 17. G. Zhang, G. Montemezzani, and P. Günter, "Orientational photorefractive effect in nematic liquid crystal with externally applied fields", J. Appl. Phys. 88, 1709-1717 (2000).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA0-0007-0018
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