Abstract
Metalenses offer a unique platform to focus light by manipulating the properties of an incoming light wavefront. It is still a challenge to create an achromatic polarization-independent metalens, because of the complexity of satisfying the phase profile and group delay at the same time. In this paper, we propose an achromatic and polarization-independent metalens based on four-fold symmetric LiNbO3 meta-unit elements which works well in the visible band from 400 to 760 nm. The numerical aperture of our metalens is 0.125, and the transmission efficiency is over 90%, the average focusing efficiency is nearly 71%.
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