Title :
Transient diffraction due to ionic conduction in nematic liquid crystal cells
Author :
Ochi, K. ; Todorokihara, M. ; Naito, H.
Author_Institution :
Dept. of Phys. & Electron., Osaka Prefecture Univ., Japan
Abstract :
Transient diffraction phenomena induced by the application of external electric field to nematic liquid crystal (4-cyano-4´-n-pentylbiphenyl) cells have been investigated. A far-field ring diffraction pattern is observed and is caused by a quasiperiodic herringbone pattern, similar in appearance to the classic Williams domain, in the nematic liquid crystal cells. The similarity and dissimilarity in the experimental features between the present; phenomena and the classic Williams domain are shown. It is also shown that the electric-field and the temperature dependences of the diffraction transients have correlation with those of current transients due to the conduction of impurity ions. It is concluded that the transient diffraction is attributable to the ion conduction via the formation of the herringbone texture
Keywords :
electro-optical effects; ionic conductivity; light diffraction; molecular orientation; nematic liquid crystals; organic compounds; texture; 4-cyano-4´-n-pentylbiphenyl; classic Williams domain; external electric field; far-field ring diffraction pattern; herringbone texture; ionic conduction; nematic liquid crystal cells; quasiperiodic herringbone pattern; temperature dependence; transient diffraction; Anisotropic magnetoresistance; Dielectric substrates; Diffraction; Glass; Gold; Hydrodynamics; Impurities; Liquid crystals; Polyimides; Threshold voltage;
Conference_Titel :
Dielectric Liquids, 1999. (ICDL '99) Proceedings of the 1999 IEEE 13th International Conference on
Conference_Location :
Nara
Print_ISBN :
0-7803-4759-5
DOI :
10.1109/ICDL.1999.799000
