INVESTIGATION OF THE SOFT-MODE RELAXATION IN A FERROELECTRIC LIQUID-CRYSTAL WITH PICOSECOND LASER-INDUCED DYNAMIC GRATINGS

被引：5
|
作者：
MACDONALD, R
GREBE, D
机构：
[1] Optisches Institut Technische, Universität Berlin, D-1000 Berlin 12
来源：
PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.70.2746
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The relaxation of light-induced tilt-angle changes in a ferroelectric smectic-C* liquid crystal is investigated with picosecond laser-induced dynamic gratings. Grating buildup and decay is monitored by diffraction of a cw laser beam. It is shown that reorientation of the liquid-crystal molecules is achieved by rapid optical heating and follows the temperature rise with a characteristic time constant, depending on temperature. The observed rise times correspond to the soft-mode relaxation of the order parameter in a Landau theory describing the smectic-C*-smectic-A phase transition.
引用
收藏
页码：2746 / 2749
页数：4
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