As a unique electric-optics material, liquid crystals (LCs) have been used in various light-control applications. In LC-based light-control devices, the structural alignment of LC molecules is of great significance. Generally, additional alignment layers are required for LC lens and microlens, such as rubbed polyimide (PI) layers or photoalignment layers. In this paper, an electrically controlled liquid crystal microlens array (EC-LCMLA) based on single-crystal graphene (SCG) coupling alignment is proposed. A monolayer SCG with high conductivity and initial anchoring of LC molecules was used as a functional electrode, thus no additional alignment layer is needed, which effectively simplifies the basic structure and process flow of conventional LCMLA. Experiments indicated that a uniform LC alignment can be acquired in the EC-LCMLA cell by the SCG coupling alignment effect. The common optical properties including focal lengths and point spread function (PSF) were measured experimentally. Experiments demonstrated that the proposed EC-LCMLA has good focusing performance in the visible to near-infrared range. Moreover, the plenoptic imaging in Galilean mode was achieved by integrating the proposed EC-LCMLA with photodetectors. Digital refocusing was performed to obtain a rendering image of the target.

中文翻译：

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基于单晶石墨烯耦合对准的电控液晶微透镜阵列用于全光成像


作为一种独特的电光材料，液晶（LC）已被用于各种光控制应用。在基于液晶的光控器件中，液晶分子的结构排列具有重要意义。通常，LC 透镜和微透镜需要额外的配向层，例如摩擦聚酰亚胺 (PI) 层或光配向层。本文提出了一种基于单晶石墨烯（SCG）耦合排列的电控液晶微透镜阵列（EC-LCMLA）。采用具有高电导率和LC分子初始锚定的单层SCG作为功能电极，因此不需要额外的取向层，有效简化了传统LCMLA的基本结构和工艺流程。实验表明，通过SCG耦合对准效应，可以在EC-LCMLA细胞中获得均匀的LC对准。通过实验测量了常见的光学特性，包括焦距和点扩散函数（PSF）。实验表明，所提出的 EC-LCMLA 在可见光到近红外范围内具有良好的聚焦性能。此外，伽利略模式的全光成像是通过将所提出的 EC-LCMLA 与光电探测器集成来实现的。进行数字重聚焦以获得目标的渲染图像。