TITLE

Effects of applied electric field on orientational photorefraction in porphyrin:Zn-doped nematic liquid crystals

AUTHOR(S)
Ki Hyun Kim; Eun Ju Kim; Sang Jo Lee; Jung Hoon Lee; Chong Hoon Kwak; Jeong Eun Kim
PUB. DATE
July 2004
SOURCE
Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p366
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We observed an orientational photorefractive effect in porphyrin:Zn-doped nematic liquid crystals by measuring two beam coupling gain and diffraction efficiency under the influence of applied electric field. The gain and diffraction efficiency curves against applied electric field typically reveal resonant type curves, rapidly increasing to its maximum values and then gradually decreasing, but have clearly distinct peak positions. Based on the material equations and the torque balance equation of director axis reorientation of liquid crystals, we theoretically derived the expressions for the orientational photorefractive gain and diffraction efficiency, showing good agreement with the experimental results.
ACCESSION #
13791219

 

Related Articles

  • Direction-tunable cholesteric phase gratings. I-An Yao; Chien-Huang Liaw; Shu-Hsia Chen; Jin-Jei Wu // Journal of Applied Physics;8/1/2004, Vol. 96 Issue 3, p1760 

    In suitable conditions, the homeotropic aligned cholesteric liquid crystal (ChLC) cell can be in fingerprint texture when abruptly switching off the applied electric field. The stripe orientation depends not only on the thickness-to-pitch (d/P0) ratio, but also on the applied driving voltage. In...

  • meso-Tetrathienylporphyrins: Steady-state emission and structural properties. Bhyrappa, P.; Sankar, M.; Varghese, B.; Bhavana, P. // Journal of Chemical Sciences;Sep2006, Vol. 118 Issue 5, p393 

    meso-Tetra (2′- and 3′-thienyl)porphyrins and their Zn(II)--complexes were examined by steady-state fluorescence measurements. These molecules exhibit significant bathochromic shift in their emission bands with decreased quantum yields relative to their corresponding...

  • Dissociation kinetics of cobalt and zinc β-octabromo- meso-tetraphenyl- and β-octaethyl- meso-tetraphenylporphyrin complexes. Pukhovskaya, S. G.; Guseva, L. Zh.; Semeikin, A. S.; Golubchikov, O. A. // Kinetics & Catalysis;Mar2007, Vol. 48 Issue 2, p190 

    Kinetics of solvoprotolytic dissociation of zinc and cobalt porphyrin complexes with a porphyrin macrocycle distorted to different extents (β-octaethyl- meso-tetraphenylporphyrin and β-octabromo- meso-tetraphenylporphyrin) have been studied in binary proton-donating solvents. The main...

  • First-order Fr�edericksz transition and front propagation in a liquid crystal light valve with feedback. Clerc, M. G.; Nagaya, T.; Petrossian, A.; Residori, S.; Riera, C. S. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Mar2004, Vol. 28 Issue 3, p335 

    Fr�edericksz transition can become subcritical in the presence of a feedback mechanism that leads to the dependence of the local electric field onto the liquid crystal re-orientation angle. We have characterized experimentally the first-order Fr�edericksz transition in a Liquid Crystal...

  • Nature of smectic A*-C* phase transitions in a series of ferroelectric liquid crystals with little smectic layer shrinkage. Bezner, Samuel; Krueger, Michael; Hamplová, Věra; Glogarová, Milada; Giesselmann, Frank // Journal of Chemical Physics;2/7/2007, Vol. 126 Issue 5, p054902 

    The smectic layer spacing of two homologous series of ferroelectric liquid crystal compounds was characterized by small-angle x-ray diffraction and different degrees of smectic layer shrinkage on cooling from the SmA* into the SmC* phase were observed. The smectic A*-smectic C* phase transition...

  • Electro-optic characteristics and switching principle of a single-cell-gap transflective liquid-crystal display associated with in-plane rotation of liquid crystal driven by a fringe-field. Song, J. H.; Lim, Y. J.; Lee, M.-H.; Lee, S. H.; Shin, S. T. // Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p011108 

    A single-gap transflective liquid-crystal (LC) display associated with in-plane rotation of the LC director was designed. In the device, a fringe electric field drives to rotate a homogeneously aligned LC in plane to optimize polarization efficiency. Rotating degrees of the LC director, 22.5°...

  • Laser induced gratings enhanced by surface-charge mediated electric field in doped nematic liquid crystals. Xiang, Ying; Liu, Yi-Kun; Li, Tao; Yang, Shun-Lin; Jiang, Zhi-Jie // Journal of Applied Physics;Sep2008, Vol. 104 Issue 6, p063107 

    The optically induced grating enhanced by dc electric field in nematic liquid crystal (LC) doped with copper porphyrin is studied. The reorientational effect of the LC was not observed for the writing beams with the intensity up to 500 mW/mm2, but the threshold of the reorientation was reduced...

  • Defect structures in nematic liquid crystals around charged particles. Tojo, K.; Furukawa, A.; Araki, T.; Onuki, A. // European Physical Journal E -- Soft Matter;Sep2009, Vol. 30 Issue 1, p55 

    We numerically study the orientation deformations in nematic liquid crystals around charged particles. We set up a Ginzburg-Landau theory with inhomogeneous electric field. If the dielectric anisotropy $ \varepsilon_{1}^{}$ is positive, Saturn-ring defects are formed around the particles. For $...

  • Tunable-focus flat liquid crystal spherical lens. Hongwen Ren; Yun-Hsing Fan; Gauza, Sebastian; Shin-Tson Wu // Applied Physics Letters;6/7/2004, Vol. 84 Issue 23, p4789 

    A tunable-focus spherical lens using two flat substrates and inhomogeneous electric field over a homogeneous liquid crystal (LC) layer is demonstrated. The top flat substrate has an imbedded spherical indium–tin–oxide (ITO) electrode and the bottom has a planar ITO electrode on its...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics