Acoustic anisotropy in 5CB liquid crystal cells as determined by using Brillouin light scattering

被引：8
|
作者：
Kim, Jae Hyun [1 ]
Kim, Tae Hyun [1 ]
Ko, Jae-Hyeon [1 ]
Kim, Jong-Hyun [2 ]
机构：
[1] Hallym Univ, Dept Phys, Chunchon 200702, South Korea
[2] Chungnam Natl Univ, Dept Phys, Taejon 305764, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2012年 / 61卷 / 06期
基金：
新加坡国家研究基金会;
关键词：
Liquid crystal; 5CB; Acoustic anisotropy; Elastic constant; Attenuation coefficient; Brillouin scattering; PHASE;
D O I：
10.3938/jkps.61.862
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The angular dependence of Brillouin spectra of 4-n-pentyl-4-cyano-biphenyl (5CB) liquid crystals homogeneously and homeotropically confined in a planar liquid-crystal (LC) cell were measured using a 6-pass tandem Fabry-Perot interferometer. The sound velocity and the elastic constant of 5CB were obtained from the Brillouin shift without knowing the refractive index thanks to a special right-angle scattering geometry. The sound velocity and the attenuation coefficient of the longitudinal acoustic waves propagating along the direction of the director were larger than those of the longitudinal sound waves propagating along the direction perpendicular to the director. Based on the observed acoustic anisotropy, the three elastic constants C (11), C (33), and C (13) could be obtained.
引用
收藏
页码：862 / 866
页数：5
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