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Optimized Soft Lithography Method for Polymer Cholesteric Liquid Crystal Flakes Fabrication

机译：聚合物胆甾型液晶片的优化软光刻工艺

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摘要

Polymer cholesteric liquid crystal (PCLC) flakes are gaining increasing interest for a wide variety of applications because of their unique optical properties and capabilities. Soft lithography is the most effective way to fabricate regularly shaped PCLC flakes. However, it is not easy to peel the flakes from the mold without breaking them. In order to peel the PCLC flakes from the patterned polydimethylsiloxane (PDMS) mold in a convenient way, in this paper, a method of coating a layer of polyvinyl alcohol (PVA) on a PDMS mold was proposed. The influence of the thickness of the PVA layer on the shape of the PCLC flakes and the release time from the PDMS mold were investigated. The results show that the presence of the PVA layer can speed up the release of the PCLC flakes and help maintain the shape effectively. Notably, the utilization of a PVA layer makes the PDMS mold recyclable. The influence of PCLC flake shape was also studied. This work will promote the development of switchable PCLC flake-based technologies.
机译：聚合物胆甾型液晶（PCLC）薄片由于其独特的光学特性和功能而受到越来越多的关注。软光刻是制造规则形状的PCLC薄片的最有效方法。但是，将薄片从模具上剥离而不弄碎是不容易的。为了方便地从图案化的聚二甲基硅氧烷（PDMS）模具上剥离PCLC薄片，本文提出了一种在PDMS模具上涂覆一层聚乙烯醇（PVA）的方法。研究了PVA层厚度对PCLC薄片形状和PDMS模具释放时间的影响。结果表明，PVA层的存在可以加快PCLC薄片的释放，并有助于有效地保持形状。值得注意的是，PVA层的使用使PDMS模具可回收。还研究了PCLC薄片形状的影响。这项工作将促进可切换PCLC薄片技术的发展。

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