Plasmonic ommatidia for lensless compound-eye vision
Plasmonic ommatidia for lensless compound-eye vision
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DOI：
10.1038/s41467-020-15460-0
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发表时间：
2020-04-02
影响因子：
16.6
通讯作者：
Paiella, Roberto
中科院分区：
文献类型：
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作者：
Kogos, Leonard C.;Li, Yunzhe;Paiella, Roberto
昆虫和甲壳类等节肢动物的视觉系统基于复眼结构，由指向不同方向的单个成像元素(小眼)的密集阵列组成。这种布置对于需要极大尺寸小型化、广角视场和对运动的高敏感度的成像应用特别有吸引力。然而，直接模拟常见节肢动物眼睛的相机的实现因其弯曲的几何形状而变得复杂。在这里，我们描述了一种无透镜的平面体系结构，其中标准图像传感器阵列的每个像素都覆盖了金属等离子体纳米结构的集合，这些结构只沿着几何可调的小角度分布来传输入射光。设计、制作和测试了一套提供不同角度的定向光电探测的近红外器件。然后使用计算成像技术来演示这些设备重建相对复杂对象的高质量图像的能力。节肢动物的复眼通过同时看到各种角度提供了视觉优势，但模仿它们的相机通常是弯曲的和笨重的。在这里，作者开发了一种扁平的等离子图像传感器阵列，能够在没有透镜或曲率的情况下实现高质量的广角视觉。
The vision system of arthropods such as insects and crustaceans is based on the compound-eye architecture, consisting of a dense array of individual imaging elements (ommatidia) pointing along different directions. This arrangement is particularly attractive for imaging applications requiring extreme size miniaturization, wide-angle fields of view, and high sensitivity to motion. However, the implementation of cameras directly mimicking the eyes of common arthropods is complicated by their curved geometry. Here, we describe a lensless planar architecture, where each pixel of a standard image-sensor array is coated with an ensemble of metallic plasmonic nanostructures that only transmits light incident along a small geometrically-tunable distribution of angles. A set of near-infrared devices providing directional photodetection peaked at different angles is designed, fabricated, and tested. Computational imaging techniques are then employed to demonstrate the ability of these devices to reconstruct high-quality images of relatively complex objects. The compound eyes of arthropods provide a visual advantage by seeing a wide range of angles all at once, but cameras that mimic them are usually curved and bulky. Here, the authors develop a flat, plasmonic image sensor array that enables high-quality wide-angle vision without lenses or curvature.