A study on achromatic metalens in the visible range

Abstract

The core of the study of metalens is the wavefront shaping of incident light using optical elements whose thickness is in the wavelength range. This integrated and miniaturized optical structure will be widely used in common optical instruments and nano optical devices. In this paper, the phase and group delay of light are controlled by designing the nanostructured unit, and the achromatic metalens with a large bandwidth is realized. However, achromatic metalens does not cover the whole visible spectrum. In this paper, the author demonstrates an achromatic metalens for a certain wavelength of visible light (400nm-600nm).