  Polarimetric imaging has a wide range of applications for uncovering features
invisible to human eyes and conventional imaging sensors. Compact, fast,
cost-effective and accurate full-Stokes polarimetric imaging sensors are highly
desirable in many applications, which, however, remain elusive due to
fundamental material limitations. Here we present a Metasurface-based
Full-Stokes Polarimetric Imaging sensor (MetaPolarIm) realized by integrating
an ultrathin (~600 nm) metasurface polarization filter array (MPFA) onto a
visible imaging sensor with CMOS compatible fabrication processes. The MPFA is
featured with broadband dielectric-metal hybrid chiral metasurfaces and
double-layer nanograting polarizers. This chip-integrated polarimetric imaging
sensor enables single-shot full-Stokes imaging (speed limited by the CMOS
imager) with the most compact form factor, record high measurement accuracy,
dual-color operation (green and red) and a full angle of view up to 40 degrees.
MetaPolarIm holds great promise to enable transformative applications in
autonomous vision, industry inspection, space exploration, medical imaging and
diagnosis.
