Lead halide perovskites CH3NH3PbX3 (MAPbX3) are known to have high
refractive index and controllable bandgap, making them attractive for
all-dielectric and tunable metasurfaces. Till now, perovskite metasurfaces
have only been used in structural colors. More interesting meta-devices with
2π phase control are still absent. Here, MAPbX3-perovskite-based
metasurfaces are experimentally demonstrated with a complete control of
phase shift in a reflection mode. By utilizing MAPbBr3 cut-wires as
meta-atoms on a ground metal film, it is found that the MAPbBr3 perovskite
metasurface can produce full phase control from 0 to 2π and high reflection
efficiency simultaneously. Consequently, high-efficiency polarization
conversion, anomalous reflection, and meta-holograms are successfully
produced. Most interestingly, the bandgap of the MAPbX3 perovskite can be
post-synthetically and reversibly tuned via anion exchange, providing a new
approach to dynamically control of the all-dielectric meta-devices with novel
function such as anomalous reflection and hologram.