Bioinspired Fabrication of High-Quality 3D Artificial Compound Eyes by Voxel-Modulation Femtosecond Laser Writing for Distortion-Free Wide-Field-of-View Imaging
Bioinspired Fabrication of High-Quality 3D Artificial Compound Eyes by Voxel-Modulation Femtosecond Laser Writing for Distortion-Free Wide-Field-of-View Imaging
复制标题
通过体素调制飞秒激光写入实现无失真宽视场成像仿生制造高质量 3D 人工复眼
DOI：
10.1002/adom.201400175
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发表时间：
2014-08-01
影响因子：
9
通讯作者：
Sun, Hong Bo
中科院分区：
文献类型：
--
作者：
Wu, Dong;Wang, Jian-Nan;Sun, Hong Bo
小视场（FOV）限制了从生物显微镜到商业相机和军用雷达的各种检测/成像设备的视野范围。迄今为止，已经利用鱼眼透镜、折反射透镜和旋转相机实现了FOV超过90度的成像。然而，这些装置遭受固有的成像失真并且需要多个庞大的元件。受自然界中发现的复眼的启发，本文通过先进的3D人工眼结构提出了一种小尺寸（84 μ m）、无失真、宽视场成像系统。利用一种有效的光学技术--高速体素调制激光扫描（HVLS）技术实现了人工眼的三维结构。该眼睛具有六边形形状、高填充因子（FF）（100%）、大数值孔径（NA）（0.4）、超低表面粗糙度（2.5 nm）和非球面轮廓，可在所有方向上提供高均匀性光学（误差< +/- 6%）和恒定分辨率（FWHM = 1.7 +/- 0.1 μ m）。定量测量表明，与单个透镜相比，在30度/45度入射下，眼睛将成像失真减少了2/3倍。无失真FOV可以控制在30度到90度之间。
The small field-of-view (FOV) limits the range of vision in various detecting/imaging devices from biological microscopes to commercial cameras and military radar. To date, imaging with FOV over 90 degrees has been realized with fish-eye lenses, catadioptric lens, and rotating cameras. However, these devices suffer from inherent imaging distortion and require multiple bulky elements. Inspired by compound eyes found in nature, here a small-size (84 mu m), distortion-free, wide-FOV imaging system is presented via an advanced 3D artificial eye architecture. The 3D artificial eye structure is accomplished by exploiting an effective optical strategy - high-speed voxel-modulation laser scanning (HVLS). The eye features a hexagonal shape, high fill factor (FF) (100%), large numerical aperture (NA) (0.4), ultralow surface roughness (2.5 nm) and aspherical profile, which provides high uniformity optics (error < +/- 6%) and constant resolution (FWHM = 1.7 +/- 0.1 mu m) in all directions. Quantitative measurement shows the eye reduces imaging distortion by two/three times under 30 degrees/45 degrees incidence, compared with a single lens. The distortion-free FOV can be controlled from 30 degrees to 90 degrees.