High transmission focusing lenses based on ultrathin all-dielectric Huygens' metasurfaces

摘要

Due to its designability, metasurfaces have been widely used to implement various miniaturized optical components, especially the lenses. However, most of the lenses currently designed tend to have high aspect ratios, which greatly hinders their practical applications. Among the various types of metasurfaces, Huygens' metasurfaces offer a new perspective, which utilize the spectrally overlapping electric dipole (ED) and magnetic dipole (MD) Mie-type resonances to achieve efficient wave-front control. Here, we proposed and designed Huygens' metasurfaces that can efficiently manipulate linearly polarized light to perform beam focusing (73% transmission efficiency for cylindrical lens and 68% transmission efficiency for aspheric lens) at near-infrared wavelengths. Additionally, the most significant advantage of the proposed metasurface is that it has a low aspect ratio, which makes it an ideal platform for future integration on optical chip.