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具有定制形状和预定变形的响应型液晶网络微结构用于自适应软微光学

Responsive Liquid Crystal Network Microstructures with Customized Shapes and Predetermined Morphing for Adaptive Soft Micro-Optics.

作者信息

Cheng Ming, Cai Wenfeng, Wang Zhenming, Chen Lei, Yuan Dandan, Ma Zongjun, Bai Ziyan, Kong Delai, Cen Mengjia, Xu Shaolin, Srivastava Abhishek Kumar, Liu Yan Jun

机构信息

Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

Shenzhen Engineering Research Center for High Resolution Light Field Display and Technology, Southern University of Science and Technology, Shenzhen 518055, China.

出版信息

ACS Appl Mater Interfaces. 2024 Jun 19;16(24):31776-31787. doi: 10.1021/acsami.4c04275. Epub 2024 Jun 10.

Abstract

Stimuli-responsive materials have garnered substantial interest in recent years, particularly liquid crystal networks (LCNs) with sophisticatedly designed structures and morphing capabilities. Extensive efforts have been devoted to LCN structural designs spanning from two-dimensional (2D) to three-dimensional (3D) configurations and their intricate morphing behaviors through designed alignment. However, achieving microscale structures and large-area preparation necessitates the development of novel techniques capable of facilely fabricating LCN microstructures with precise control over both overall shape and alignment, enabling a 3D-to-3D shape change. Herein, a simple and cost-effective in-cell soft lithography (ICSL) technique is proposed to create LCN microstructures with customized shapes and predesigned morphing. The ICSL technique involves two sequential steps: fabricating the desired microstructure as the template by using the photopolymerization-induced phase separation (PIPS) method and reproducing the LCN microstructures through templating. Meanwhile, surface anchoring is employed to design and achieve molecular alignment, accommodating different deformation modes. With the proposed ICSL technique, cylindrical and spherical microlens arrays (CMLAs and SMLAs) have been successfully fabricated with stimulus-driven polarization-dependent focusing effects. This technique offers distinct advantages including high customizability, large-area production, and cost-effectiveness, which pave a new avenue for extensive applications in different fields, exemplified by adaptive soft micro-optics and photonics.

摘要

近年来,刺激响应材料引起了广泛关注,尤其是具有精心设计结构和变形能力的液晶网络(LCNs)。人们已经做出了大量努力,致力于LCN的结构设计,涵盖从二维(2D)到三维(3D)的构型,以及通过设计排列实现其复杂的变形行为。然而,要实现微观结构和大面积制备,就需要开发能够轻松制造LCN微观结构的新技术,精确控制整体形状和排列,实现从3D到3D的形状变化。在此,我们提出了一种简单且经济高效的细胞内软光刻(ICSL)技术,以创建具有定制形状和预先设计变形的LCN微观结构。ICSL技术包括两个连续步骤:通过光聚合诱导相分离(PIPS)方法制造所需的微观结构作为模板,并通过模板复制LCN微观结构。同时,采用表面锚定来设计和实现分子排列,以适应不同的变形模式。利用所提出的ICSL技术,已经成功制造出具有刺激驱动的偏振依赖聚焦效应的圆柱形和球形微透镜阵列(CMLAs和SMLAs)。该技术具有显著优势,包括高度可定制性、大面积生产和成本效益,为不同领域的广泛应用开辟了一条新途径,以自适应软微光学和光子学为例。

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