Optical Properties of Aligned Nematic Liquid Crystals in Electric Field
Optical Properties of Aligned Nematic Liquid Crystals in Electric Field作者机构：不详
出 版 物：《Journal of Modern Physics》 (现代物理（英文）)
年 卷 期：2011年第2卷第4期
页 面：248-255页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Liquid Crystals Thin Films Photolithography Optical Properties
摘 要：In this study, the optical transmittance of aligned nematic liquid crystals (ANLCs) was investigated in terms of temperature variations through electrooptic effects under DC electric field. The optical transmittances of the planar and homeotropically aligned liquid crystal cells, which were prepared by conventional rubbing and photolithographic technique on the polyimide thin films for molecular alignment, were measured in their phase transition region. The results of measurement for both orientations, the distribution curve of the optical transmittance exhibits displacement toward to low level at the beginning and then to high level by the temperature variations, while the electric field increases. It was also observed that the domain structure of the materials were affected considerably by the applied electric field and phase transition region of the aligned structures had broader range than by the pure crystalline structure and its phase transition temperature was changed by the molecular anisotropy. Finally, in photolithographic method strong bonds between the molecules and the orienting surface were observed in high contrast to rubbing method.
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