Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University , Cambridge, Massachusetts 02138, United States.
Nano Lett. 2017 Aug 9;17(8):4902-4907. doi: 10.1021/acs.nanolett.7b01888. Epub 2017 Jul 5.
Recently, developments in meta-surfaces have allowed for the possibility of a fundamental shift in lens manufacturing-from the century-old grinding technology to nanofabrication-opening a way toward mass producible high-end meta-lenses. Inspired by early camera lenses and to overcome the aberrations of planar single-layered meta-lenses, we demonstrate a compact meta-lens doublet by patterning two metasurfaces on both sides of a substrate. This meta-lens doublet has a numerical aperture of 0.44, a focal length of 342.5 μm, and a field of view of 50° that enables diffraction-limited monochromatic imaging along the focal plane at a wavelength of 532 nm. The compact design has various imaging applications in microscopy, machine vision, and computer vision.
最近，超表面的发展使得透镜制造可能发生根本性转变——从有百年历史的研磨技术转变为纳米制造，为大规模生产高端超透镜开辟了道路。受早期相机镜头的启发，并为了克服平面单层超透镜的像差，我们通过在基底两侧的两个超表面上进行图案设计，展示了一个紧凑的超透镜对。该超透镜对的数值孔径为 0.44，焦距为 342.5μm，视场角为 50°，能够在 532nm 波长下沿焦平面实现衍射极限的单色成像。这种紧凑的设计在显微镜、机器视觉和计算机视觉等领域有各种成像应用。
