Digitally designed ultrathin metasurfaces for multi-wavelength optics in the visible

Metasurface-based optics have the ability to shape light by locally changing the properties of the incident illumination. They hold great potential to promote a new generation of optical systems for imaging and sensing.... [ view full abstract ]

Metasurface-based optics have the ability to shape light by locally changing the properties of the incident illumination. They hold great potential to promote a new generation of optical systems for imaging and sensing. However, due to the diffractive nature of these metasurfaces, their performance is sensitive to the wavelength of operation. Here we present a new approach to design single-layer multi-wavelength metasurfaces using ultrathin dielectric resonators as structural elements. We introduce a digital transmission scheme which enables opportunities to design multi-wavelength optics beyond conventional binary diffractive optics. The potential of this approach is demonstrated with achromatic meta-lenses in the visible.