  Metasurfaces composed of anisotropic subwavelength structures provide an
ultrathin platform for a compact, real-time polarimeter. However, applications
in polychromatic scenes are restricted by the limited operating bandwidths and
degraded imaging quality due to the loss of spectral information. Here, we
demonstrated full-color polarization imaging based on an achromatic polarimeter
consisting of four polarization-dependent metalenses. Boosted by an intelligent
design scheme, arbitrary phase compensation and multi-objective matching are
effectively compatible with a limited database. Broadband achromaticity for
wavelengths ranging from 450 nm to 650 nm, with a relative bandwidth of nearly
0.435, is achieved for the full Stokes imaging. The experimental polarization
reconstructed errors for operating wavelengths of 450 nm, 550 nm, and 650 nm
are 7.5%, 5.9%, and 3.8%, respectively. The full-color and full-polarization
imaging capability of the device is also verified with a customized object. The
proposed scheme paves the way for further developing polarization imaging
toward practical applications.
