Time-resolved infrared spectroscopy of molecule/binding site reorientation during ferroelectric liquid crystal electro-optic switching

2000 ◽  
Vol 62 (4) ◽  
pp. 5154-5159 ◽  
Author(s):  
Won Gun Jang ◽  
Cheol S. Park ◽  
Noel A. Clark
1995 ◽  
Vol 49 (7) ◽  
pp. 977-980 ◽  
Author(s):  
Norihisa Katayama ◽  
Takashi Sato ◽  
Yukihiro Ozaki ◽  
Katsuyuki Murashiro ◽  
Makoto Kikuchi ◽  
...  

Pulsed electric-field-induced reorientation of a ferroelectric liquid crystal (FLC), 5-(2-fluorooctyloxy)-2-(4-hexylphenyl)-pyrimidine, has been investigated by using a dispersive submicrosecond time-resolved infrared spectroscopic technique. The observed absorbance decay for a band at 1440 cm−1 due to a ring-stretching mode of the phenylpyrimidine group indicates that the FLC molecule reorients from a stationary state with a slight delay (less than 1 μs) just after the upswing of the electric field, while counter-reorientation occurs with a delay time of a microsecond after the reverse of the electric field. The delay time for the counter-reorientation changes with temperature, indicating that the viscosity has a strong influence on the delay time. It is also indicated in the present study that the whole FLC molecule reorients simultaneously as a rigid rod in both the preliminary and the counter-reorientation process.


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