Lin Ren Jie, Su Vin-Cent, Wang Shuming, Chen Mu Ku, Chung Tsung Lin, Chen Yu Han, Kuo Hsin Yu, Chen Jia-Wern, Chen Ji, Huang Yi-Teng, Wang Jung-Hsi, Chu Cheng Hung, Wu Pin Chieh, Li Tao, Wang Zhenlin, Zhu Shining, Tsai Din Ping
Department of Physics, National Taiwan University, Taipei, Taiwan.
Department of Electrical Engineering, National United University, Miaoli, Taiwan.
Nat Nanotechnol. 2019 Mar;14(3):227-231. doi: 10.1038/s41565-018-0347-0. Epub 2019 Jan 21.
A light-field camera captures both the intensity and the direction of incoming light. 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) nanoantennas 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.
光场相机可捕捉入射光的强度和方向。这使得用户能够重新对焦图片，并随后重建景深信息。光场成像研究可分为两个部分：采集和渲染。微透镜阵列已用于采集，但获得无球差的宽带消色差图像仍然具有挑战性。在这里，我们描述了一种由氮化镓（GaN）纳米天线制成的超构透镜阵列，它可用于捕捉光场信息，并展示了一种无色差的全彩色光场相机。该超构透镜阵列包含一个由60×60个超构透镜组成的阵列，其直径为21.65μm。该相机在白光照明下具有1.95μm的衍射极限分辨率。场景中每个物体的深度可以从一系列具有不同对焦深度的渲染图像中逐片重建。全彩色、消色差的光场相机可在机器人视觉、自动驾驶车辆以及虚拟现实和增强现实等各种领域找到应用。
