Metalenses consist of an array of optical nanoantennas on a surface capable of manipulating the incoming light for focusing. We propose an achromatic dielectric metalens working in a visible region. Various geometrical designs are utilized to compensate the phase requirement for different wavelengths. It＇s able to focus the waves onto the same focal plane. We also show full-color imaging by using achromatic metalenses to demonstrate its potential for full-color optical applications.

We demonstrate a broadband achromatic metalens working in the visible light region. A lossless semiconductor material is used to construct unit elements to access waveguide-like resonant modes which exhibit high conversion efficiency. Various geometrical designs with different resonance modes are utilized to compensate the phase requirement for different wavelengths.The achieved continuous achroma

With the advantages of lightsmall size, the metalenses can be used to miniaturizing optical systems such as the microscope, camera, mobile phone as well as dashboard camera. They will be smallercheaper, have better image qualityhigh applicability than conventional optical systems.