Time-resolved Total Internal Reflection Raman Scattering Study on Electric-Field-Induced Reorientation Dynamics of Nematic Liquid Crystal of 4-Hexyl-4′-Cyanobiphenyl

1998 ◽  
Vol 312 (1) ◽  
pp. 69-94 ◽  
Author(s):  
T. Morikawa ◽  
E. Shirai ◽  
J. Tanno ◽  
H. Takanashi ◽  
A. Yasuda ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Raman Scattering ◽  
Nematic Liquid Crystal ◽  
Total Internal Reflection ◽  
Internal Reflection ◽  
Time Resolved ◽  
Scattering Study ◽  
Reorientation Dynamics

scholarly journals Modeling Reorientation Dynamics of Electrically Assisted Light-Induced Gliding of Nematic Liquid-Crystal Easy Axis

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
S. V. Pasechnik ◽  
A. V. Dubtsov ◽  
D. V. Shmeliova ◽  
D. A. Semerenko ◽  
V. G. Chigrinov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Easy Axis ◽  
Uv Light ◽  
Light Polarization ◽  
Balance Model ◽  
Polarization Azimuth ◽  
Electrically Assisted ◽  
Reorientation Dynamics

The phenomenological torque balance model previously introduced to describe the electrically assisted light-induced gliding is generalized to study the reorientation dynamics of the nematic liquid crystal easy axis at photoaligned azo-dye films under the combined action of in-plane electric field and reorienting UV light linearly polarized at varying polarization azimuth,φp. We systematically examine the general properties of the torque balance model by performing analysising the bifurcations of equilibria at different values of the polarization azimuth and apply for the model to interpret the experimental results. These involve observation of the pronounced purely photoinduced reorientation atφp≠0, as opposed to the case where the light polarization vector is parallel to the initial easy axis (φp=0), and the reorientation is almost entirely suppressed. In the regions between electrodes with nonzero electric field, the effects described by the model are that (a) the dynamics of reorientation slows down withφpand (b) the sense of easy axis rotation is independent of the sign ofφp.

Two-Dimensional Infrared Spectroscopy of Electric-Field-Induced Reorientation Dynamics of a Mixed Nematic Liquid Crystal

1993 ◽  
Vol 47 (9) ◽  
pp. 1390-1393 ◽  
Author(s):  
H. Sasaki ◽  
M. Ishibashi ◽  
A. Tanaka ◽  
N. Shibuya ◽  
R. Hasegawa
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Signal To Noise Ratio ◽  
Two Dimensional ◽  
Multiple Reflections ◽  
2D Ir ◽  
Ac Electric Field ◽  
Reorientation Dynamics ◽  
The Fourier Transform

A two-dimensional infrared (2D IR) spectrometer has been modified by the following methods to solve several problems on the 2D IR spectroscopy of electric-field-induced reorientation dynamics of a mixed nematic liquid crystal: (1) The response of the liquid crystal (LC) to an electric field was stabilized by an amplitude-modulated ac electric field. (2) Formulation of an anti-reflection coating (ARC) has been proposed to suppress the interference caused by multiple reflections between IR liquid crystal cell windows. (3) The Fourier transform procedure has been modified to correct the phase of the dynamic difference interferograms without spectral anomalies. These modifications can provide a better signal-to-noise ratio and reproducible 2D IR spectrum of a mixed nematic liquid crystal.

Raman Scattering Study of Phase Biaxiality in a Thermotropic Bent-Core Nematic Liquid Crystal

2010 ◽  
Vol 105 (2) ◽  
Author(s):  
Min Sang Park ◽  
Beom-Jin Yoon ◽  
Jung Ok Park ◽  
Veena Prasad ◽  
Satyendra Kumar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Raman Scattering ◽  
Nematic Liquid Crystal ◽  
Scattering Study
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