Opt Express. 2022 Aug 15;30(17):30750-30759. doi: 10.1364/OE.467657.
Microlens arrays on curved surfaces are regarded as critical elements of bionic compound eyes (BCEs), which exhibit the comparative advantages of a wide field of view and tracking fast-moving objects. However, the fabrication of a curved microlens array is still challenging. Along these lines, in this work, a straightforward, rapid, and low-cost technique for the fabrication of curved microlens arrays is reported by using the self-assembly technique. A reactive ion etching process treated the surface of the curved polydimethylsiloxane (PDMS) substrate to generate a hydrophobic-hydrophilic pattern. Then, the curved microlens array can be realized by dewetting a liquid glue onto the substrate using the dip-coating method and followed by crosslinking. The proposed BCE structure consists of 2400 microlenses (400 - µm diameter and 440 - µm center distance) arranged in a hexagonal configuration on a curved PDMS surface (34 - mm diameter and 40.4 - mm curvature radius). A field-of-view of 50° was demonstrated, which has potential applications in various fields including imaging sensors, medical diagnostics, machine vision systems, and photodetectors.
曲面微透镜阵列被认为是仿生复眼 (BCE) 的关键元件，它具有宽视场和跟踪快速移动物体的比较优势。然而，曲面微透镜阵列的制造仍然具有挑战性。在这项工作中，我们报告了一种简单、快速且低成本的制造曲面微透镜阵列的方法，该方法使用自组装技术。通过反应离子刻蚀工艺处理曲面聚二甲基硅氧烷 (PDMS) 基底的表面，生成疏水-亲水图案。然后，通过浸涂法将液体胶涂覆在基底上，并进行交联，实现曲面微透镜阵列。所提出的 BCE 结构由 2400 个微透镜（直径 400 µm，中心距 440 µm）组成，呈六边形排列在曲面 PDMS 上（直径 34 mm，曲率半径 40.4 mm）。展示了 50°的视场，在成像传感器、医学诊断、机器视觉系统和光电探测器等各个领域都有潜在的应用。
