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An azo-isomerization-induced Freedericksz transition of a nematic liquid crystal
Authors:Lin Ziyang   Jue Shi   Xiang Ying   L. P. Shi   Wang Jian   Z. X. Liang  Z. R. Qiu
Affiliation:

a Department of Physics, ZhongShan University, GuangZhou 510275, China

b Department of Chemistry, ZhongShan University, GuangZhou 510275, China

c State Key Laboratory of Ultrafast Laser Spectroscopy, Institute of Laser and Spectroscopy, ZhongShan University, GuangZhou 510275, China

Abstract:We observed an azo-isomerization-induced Freedericksz transition of the 5CB liquid crystal doped with 1% double-azo. In experiment, we found that the Freedericksz transition threshold occurred at optical intensity level of 0.3 mW/mm2 for the 12.5 μm-thickness planar alignment doped 5CB, which is four orders of magnitude lower as that for the pure 5CB. Using optical phase retardation, we measured the relations between the Freedericksz transition threshold and the pump beam polarization. The maximum twist angle of liquid crystal molecules under different pump beam intensity is given. The experiment indicated that transcis isomerization plays an important role in the decrease of the Freedericksz transition threshold.
Keywords:PACS classification codes: 61.30.Gd   64.70.Md
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