Kim Kisoo, Jang Kyung-Won, Ryu Jae-Kwan, Jeong Ki-Hun
1Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141 Republic of Korea.
2KAIST Institute for Health Science and Technology, KAIST, Daejeon, 34141 Republic of Korea.
Light Sci Appl. 2020 Feb 27;9:28. doi: 10.1038/s41377-020-0261-8. eCollection 2020.
Compound eyes found in insects provide intriguing sources of biological inspiration for miniaturised imaging systems. Here, we report an ultrathin arrayed camera inspired by insect eye structures for high-contrast and super-resolution imaging. The ultrathin camera features micro-optical elements (MOEs), i.e., inverted microlenses, multilayered pinhole arrays, and gap spacers on an image sensor. The MOE was fabricated by using repeated photolithography and thermal reflow. The fully packaged camera shows a total track length of 740 μm and a field-of-view (FOV) of 73°. The experimental results demonstrate that the multilayered pinhole of the MOE allows high-contrast imaging by eliminating the optical crosstalk between microlenses. The integral image reconstructed from array images clearly increases the modulation transfer function (MTF) by ~1.57 times compared to that of a single channel image in the ultrathin camera. This ultrathin arrayed camera provides a novel and practical direction for diverse mobile, surveillance or medical applications.
昆虫的复眼为小型成像系统提供了引人入胜的生物灵感来源。在此，我们报告一种受昆虫眼睛结构启发的超薄阵列相机，用于高对比度和超分辨率成像。该超薄相机的特点是在图像传感器上具有微光学元件（MOE），即倒置微透镜、多层针孔阵列和间隙间隔物。通过重复光刻和热回流工艺制造了微光学元件。完全封装后的相机总轨道长度为740μm，视场（FOV）为73°。实验结果表明，微光学元件的多层针孔通过消除微透镜之间的光学串扰实现了高对比度成像。与超薄相机中的单通道图像相比，从阵列图像重建的积分图像明显将调制传递函数（MTF）提高了约1.57倍。这种超薄阵列相机为各种移动、监控或医疗应用提供了一种新颖且实用的方向。
