The pretilt angle controlled by electric field was studied by the modulation ellipsometry technique. The easy direction of compensated nematic liquid crystals was controlled by surface flexoelectric torque created by the linear coupling of the director deformation and electric field. The weak anchoring energy necessary for the occurrence of flexoelectric distortion was produced by unidirectional rubbing of the clean indium–tin–oxide covered glasses with a cotton cloth. The pretilt angle was measured as a function of electric field. Long relaxation times of the optical response (hundreds of seconds) were observed. The rubbed thin polyvinyl alcohol and polyimide aligning layers were seen to promote strong anchoring energy (>0.5 erg/cm2) preventing any deviation of pretilt angle and, consequently, to suppress the optical response. The probable applications of the obtained results are discussed.
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1 March 1999
Research Article|
March 01 1999
Control of the bias tilt angles in nematic liquid crystals Available to Purchase
S. V. Yablonskii;
S. V. Yablonskii
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
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K. Nakayama;
K. Nakayama
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
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S. Okazaki;
S. Okazaki
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
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M. Ozaki;
M. Ozaki
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
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K. Yoshino;
K. Yoshino
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
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S. P. Palto;
S. P. Palto
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
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M. Yu. Baranovich;
M. Yu. Baranovich
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
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A. S. Michailov
A. S. Michailov
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
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S. V. Yablonskii
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
K. Nakayama
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
S. Okazaki
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
M. Ozaki
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
K. Yoshino
Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Ymada-Oka, Suita, Osaka 565-0871, Japan
S. P. Palto
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
M. Yu. Baranovich
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
A. S. Michailov
Institute of Crystallography of RAS, 117333, Leninskii pr.59, Moscow, Russia
J. Appl. Phys. 85, 2556–2561 (1999)
Article history
Received:
April 06 1998
Accepted:
November 19 1998
Citation
S. V. Yablonskii, K. Nakayama, S. Okazaki, M. Ozaki, K. Yoshino, S. P. Palto, M. Yu. Baranovich, A. S. Michailov; Control of the bias tilt angles in nematic liquid crystals. J. Appl. Phys. 1 March 1999; 85 (5): 2556–2561. https://doi.org/10.1063/1.369574
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