Relaxation time of molecular rotation about its long axis in the smectic-A phase of ferroelectric and antiferroelectric liquid crystals as observed by picosecond optical Kerr effect

被引:13
作者
Miyachi, K
Takanishi, Y
Ishikawa, K
Takezoe, H
Fukuda, A
机构
[1] Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Tokyo, 152, O-okayama
关键词
D O I
10.1103/PhysRevE.55.1632
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We have studied the molecular rotational motion about its long axis in ferroelectric chiral smectic-C (Sm-C*) and antiferroelectric chiral smectic-C-a (sm-C-A*) liquid crystals and observed a few tens of picosecond relaxation time. Previously reported results using degenerate four-wave mixing with 25-ps pump pulses [Lalanne et al., Phys. Rev. A 44, 6632 (1991)] claimed to show a critical slowing down in the temperature region more than 0.1 degrees C above the Sm-A-Sm-C* phase transition. Our measurements of the optical Kerr effect with 130-fs pump pulses do not show any critical slowing down in the corresponding temperature region above the phase transition from Sm-A to Sm-C* or Sm-C-A*. The result may indicate that the laser-induced molecular reorientation with tau similar to 10(-11) s scarcely couples with the tilt angle and the polarization. A possibility has been discussed that a slower rotational motion with tau greater than or equal to 10(-10) s plays a primary role for the emergence of ferroelectricity and/or antiferroelectricity.
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收藏
页码:1632 / 1636
页数:5
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