Zhang Zexu, Deng Chunsan, Fan Xuhao, Li Minjing, Zhang Mingduo, Wang Xinger, Chen Fayu, Shi Shaoxi, Zhou Yining, Deng Leimin, Gao Hui, Xiong Wei
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.
Optics Valley Laboratory, Hubei, 430074, China.
Adv Mater. 2024 Aug;36(31):e2401533. doi: 10.1002/adma.202401533. Epub 2024 Jun 3.
The precise construction of hierarchically long-range ordered structures using molecules as fundamental building blocks can fully harness their anisotropy and potential. However, the 3D, high-precision, and single-step directional assembly of molecules is a long-pending challenge. Here, a 3D directional molecular assembly strategy via femtosecond laser direct writing (FsLDW) is proposed and the feasibility of this approach using liquid crystal (LC) molecules as an illustrative example is demonstrated. The physical mechanism for femtosecond (fs) laser-induced assembly of LC molecules is investigated, and precise 3D arbitrary assembly of LC molecules is achieved by defining the discretized laser scanning pathway. Additionally, an LC-based Fresnel zone plate array with polarization selection and colorization imaging functions is fabricated to further illustrate the potential of this method. This study not only introduces a 3D high-resolution alignment method for LC-based functional devices but also establishes a universal protocol for the precise 3D directional assembly of anisotropic molecules.
使用分子作为基本构建单元精确构建分层长程有序结构能够充分利用其各向异性和潜力。然而，分子的三维、高精度和单步定向组装是一个长期悬而未决的挑战。在此，提出了一种通过飞秒激光直写（FsLDW）实现三维定向分子组装的策略，并以液晶（LC）分子为例证明了该方法的可行性。研究了飞秒（fs）激光诱导液晶分子组装的物理机制，并通过定义离散的激光扫描路径实现了液晶分子的精确三维任意组装。此外，还制备了具有偏振选择和彩色成像功能的基于液晶的菲涅耳波带片阵列，以进一步说明该方法的潜力。本研究不仅为基于液晶的功能器件引入了一种三维高分辨率取向方法，还为各向异性分子的精确三维定向组装建立了通用协议。
