Fabrication of bioinspired omnidirectional and gapless microlens array for wide field-of-view detections
Fabrication of bioinspired omnidirectional and gapless microlens array for wide field-of-view detections
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制造用于宽视场检测的仿生全向无间隙微透镜阵列
DOI：
10.1063/1.3696019
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发表时间：
2012-03-26
影响因子：
4
通讯作者：
Hou, Xun
中科院分区：
文献类型：
--
作者：
Liu, Hewei;Chen, Feng;Hou, Xun
曲线表面上的微透镜阵列对于大视场成像和传感系统是非常理想的。然而，制造这些结构在技术上具有挑战性。这封信报告了一种简单的方法，可以在曲线表面上加工紧密排列的微透镜，其灵感来自昆虫的眼睛，包括飞秒激光微加工和热机械弯曲工艺。在半球形聚甲基丙烯酸甲酯壳上制备了7600多个直径为50 μm的六边形微透镜，其结构类似于昆虫的复眼。该微透镜阵列具有高分辨率成像和大视角聚焦的光学性能。
Microlens arrays on curvilinear surfaces are highly desirable for wide field-of-view imaging and sensing systems. However, it is technically challenging to fabricate these structures. This letter reports a simple method to machine close-packed microlenses on curvilinear surfaces as inspired by the insect eyes, which involves a femtosecond-laser-based microfabrication and a thermomechanical bending process. Over 7600 hexagonal-shaped microlenses with a diameter of 50 μm were fabricated on a hemispherical poly (methyl methacrylate) shell, which is similar to the compound eyes of insects. The optical performances of the microlens array were demonstrated by the abilities of high-resolution imaging and large view-angle focusing.