Influence of molecular weight on the photorefractivity of polymer/liquid crystal composites

We report on photorefractive composites composed of poly(N-vinyl carbazole) (PVK)/liquid crystal/C60 with PVK of different molecular weight (MW). The influence of MW on the photorefractivity was studied. The results show that a higher MW leads to a larger two-beam coupling coefficient Γ and a larger...

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Bibliographic Details
Published in:Applied physics letters 2002-01, Vol.80 (1), p.10-12
Main Authors: Bai, Yaowen, Chen, Xiaofang, Wan, Xinhua, Zhou, Qi-feng, Liu, Hui, Zhang, Bo, Gong, Qihuang
Format: Article
Language:English
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Summary:We report on photorefractive composites composed of poly(N-vinyl carbazole) (PVK)/liquid crystal/C60 with PVK of different molecular weight (MW). The influence of MW on the photorefractivity was studied. The results show that a higher MW leads to a larger two-beam coupling coefficient Γ and a larger effective electric–optical coefficient. Γ over 200 cm−1 is observed for the composite based on the highest MW PVK.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1427427