Tunable Diffraction Gratings from Biosourced Lyotropic Liquid Crystals.,Advanced Materials

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Tunable Diffraction Gratings from Biosourced Lyotropic Liquid Crystals.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-04-03 , DOI: 10.1002/adma.201907376
Yuanyuan Cao _{1,

2} , Pei-Xi Wang ₂ , Francesco D'Acierno _{2,

3} , Wadood Y Hamad ₄ , Carl A Michal _{2,

3} , Mark J MacLachlan _{1,

2,

5}

Affiliation

Diffraction gratings are important for modern optical components, such as optical multiplexers and signal processors. Although liquid crystal (LC) gratings based on thermotropic LCs have been extensively explored, they often require expensive molecules and complicated manufacturing processes. Lyotropic LCs, which can be broadly obtained from both synthetic and natural sources, have not yet been applied in optical gratings. Herein, a facile grating fabrication method using a biosourced lyotropic LC formed by cellulose nanocrystals (CNCs), a material extracted from plants, is reported. Hydrogel sheets with vertically aligned uniform periodic structures are obtained by fixing the highly oriented chiral nematic LC of CNCs in polymer networks under the cooperative effects of gravity on phase separation and a magnetic field on LC orientation. The hydrogel generates up to sixth-order diffraction spots and shows linear polarization selectivity, with tunable grating periodicity controlled through LC concentration regulation. This synthesis strategy can be broadly applied to various grating materials and opens up a new area of optical materials from lyotropic LCs.

中文翻译：

生物来源溶致液晶的可调谐衍射光栅。

衍射光栅对于现代光学组件（例如光学多路复用器和信号处理器）很重要。尽管已经广泛研究了基于热致液晶的液晶（LC）光栅，但它们通常需要昂贵的分子和复杂的制造工艺。溶致液晶可以广泛地从合成和天然来源获得，尚未应用于光栅中。本文中，报道了一种使用由纤维素纳米晶体（CNC）形成的生物来源的溶致LC的简便的光栅制造方法，所述纤维素纳米晶体是从植物提取的材料。在重力对相分离和磁场对LC取向的协同作用下，将CNCs的高度取向的手性向列LC固定在聚合物网络中，从而获得具有垂直排列的均匀周期性结构的水凝胶片。水凝胶最多产生六阶衍射点，并显示出线性偏振选择性，可通过LC浓度调节来控制可调节的光栅周期性。这种合成策略可以广泛地应用于各种光栅材料，并通过溶致LC开辟了光学材料的新领域。

更新日期：2020-04-03

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