T.J. Watson Laboratory of Applied Physics, California Institute of Technology, 1200 E. California Boulevard, Pasadena, California 91125, USA.
Samsung Advanced Institute of Technology, Samsung Electronics, Samsung-ro 130, Suwon-si, Gyeonggi-do 443-803, South Korea.
Nat Commun. 2016 Nov 28;7:13682. doi: 10.1038/ncomms13682.
Optical metasurfaces are two-dimensional arrays of nano-scatterers that modify optical wavefronts at subwavelength spatial resolution. They are poised to revolutionize optics by enabling complex low-cost systems where multiple metasurfaces are lithographically stacked and integrated with electronics. For imaging applications, metasurface stacks can perform sophisticated image corrections and can be directly integrated with image sensors. Here we demonstrate this concept with a miniature flat camera integrating a monolithic metasurface lens doublet corrected for monochromatic aberrations, and an image sensor. The doublet lens, which acts as a fisheye photographic objective, has a small f-number of 0.9, an angle-of-view larger than 60° × 60°, and operates at 850 nm wavelength with 70% focusing efficiency. The camera exhibits nearly diffraction-limited image quality, which indicates the potential of this technology in the development of optical systems for microscopy, photography, and computer vision.
光学超表面是纳米散射体的二维阵列，可以在亚波长空间分辨率下改变光波前。它们有望通过实现复杂的低成本系统来彻底改变光学，在这些系统中，多个超表面通过光刻堆叠并与电子设备集成。对于成像应用，超表面堆叠可以执行复杂的图像校正，并且可以直接与图像传感器集成。在这里，我们通过一个微型平面相机演示了这一概念，该相机集成了一个用于单色像差校正的单片超表面透镜对，以及一个图像传感器。该透镜对作为鱼眼摄影物镜，其 f 数小至 0.9，视场角大于 60°×60°，在 850nm 波长下工作，聚焦效率为 70%。该相机表现出几乎衍射极限的成像质量，这表明该技术在开发显微镜、摄影和计算机视觉用光学系统方面具有潜力。
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