A light-field camera captures both the intensity and the direction of incoming light1-5. This enables a user to refocus pictures and afterwards reconstruct information on the depth of field. Research on light-field imaging can be divided into two components: acquisition and rendering. Microlens arrays have been used for acquisition, but obtaining broadband achromatic images with no spherical aberration remains challenging. Here, we describe a metalens array made of gallium nitride (GaN) nanoantennas6 that can be used to capture light-field information and demonstrate a full-colour light-field camera devoid of chromatic aberration. The metalens array contains an array of 60 × 60 metalenses with diameters of 21.65 μm. The camera has a diffraction-limited resolution of 1.95 μm under white light illumination. The depth of every object in the scene can be reconstructed slice by slice from a series of rendered images with different depths of focus. Full-colour, achromatic light-field cameras could find applications in a variety of fields such as robotic vision, self-driving vehicles and virtual and augmented reality.

中文翻译：

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用于全色光场成像的消色差金属阵列。

光场相机同时捕获入射光1-5的强度和方向。这使用户可以重新聚焦图片，然后再重建景深方面的信息。对光场成像的研究可以分为两个部分：采集和渲染。微透镜阵列已经用于采集，但是获得没有球差的宽带消色差图像仍然具有挑战性。在这里，我们描述了由氮化镓（GaN）纳米天线6制成的金属阵列，可用于捕获光场信息并演示没有色差的全色光场相机。金属元阵列包含直径为21.65μm的60×60金属元阵列。该相机在白光照射下的衍射极限分辨率为1.95μm。可以从一系列具有不同焦点深度的渲染图像中逐层重建场景中每个对象的深度。全色消色差光场相机可以在各种领域中找到应用，例如机器人视觉，自动驾驶汽车以及虚拟现实和增强现实。