Rationally Designed Dynamic Superstructures Enabled by Photoaligning Cholesteric Liquid Crystals
Rationally Designed Dynamic Superstructures Enabled by Photoaligning Cholesteric Liquid Crystals
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光配向胆甾液晶实现合理设计的动态上部结构
DOI：
10.1002/adom.201500403
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发表时间：
2015-12-01
影响因子：
9
通讯作者：
Chen, Lu-Jian
中科院分区：
文献类型：
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作者：
Ma, Ling-Ling;Li, Sen-Sen;Chen, Lu-Jian
在均匀排列的单元中产生了合适的电场，具有平行条纹的简单光栅。[14]遗憾的是，传统的机械研磨工艺产生的缺陷严重干扰了螺旋轴的连续性，因此很难得到排列有序、周期均匀的条纹(图S1，支持信息)。这就是为什么通常会报道所谓的“指纹”不均匀纹理的原因。[15]此外，操纵面内螺旋轴以实现更复杂的条纹图案的能力仍然受到高度限制。基于CLC平面内对准螺旋轴结构，实现了衍射栅[16]和光刻掩模[17]。此外，CLC光栅[14，18]的周期变化和旋转[19]使其成为非机械式波控器件的极佳候选者。因此，产生具有有序取向和可靠周期的高质量CLC超结构的能力对于上述应用至关重要。然而，如上所述，自组装的化学发光材料的质量低、可控性差，使得这项任务非常艰巨。此外，目前的机械对准技术仅适用于制作一维[14，20]或二维光栅。[21][21]
a proper electric fi eld, simple grating with parallel stripes are produced in uniformly aligned cells. [ 14 ] Unfortunately, the defects induced by conventional mechanical rubbing technique signifi cantly interrupt the continuity of helical axis, thus it is diffi cult to get orderly arranged stripes with a uniform periodicity (Figure S1, Supporting Information). That is why the so-called “fi ngerprint” nonuniform textures are usually reported. [ 15 ] Moreover, the capability to manipulate the in-plane helical axes to realize more complex stripe pattern remains highly restricted. Based on the CLC in-plane aligned helical axis structure, diffraction gratings [ 16 ] and lithography mask [ 17 ] have been demonstrated. Moreover, the variation of the period of CLC grating [ 14,18 ] and its rotation [ 19 ] make it an excellent candidate for nonmechanical beam steering devices. Thus, the capability of generating high-quality CLC superstructures with ordered orientation and reliable periodicity is crucial for above applications. However, as mentioned above, the low quality and poor controllability of the self-assembled CLCs make the task very formidable. Furthermore, the present mechanical aligning technique is only suitable to produce 1D [ 14,20 ] or 2D gratings. [ 21 ]