  Meta-optics based on optically resonant all-dielectric structures is a
rapidly developing research area driven by its potential applications for
low-loss efficient metadevices. Active, light-emitting subwavelengh
nanostructures and metasurfaces are of a particular interest for meta-optics,
as they offer unique opportunities for novel types of compact light sources and
nanolasers. Recently, the study of halide perovskites has attracted an enormous
attention due to their exceptional optical and electrical properties. As a
result, this family of materials can provide a prospective platform for modern
nanophotonics and meta-optics, allowing to overcome many obstacles associated
with the use of conventional semiconductor materials. Here we review the recent
progress in the field of halide-perovskite meta-optics with the central focus
on light-emitting nanoantennas and metasurfaces for the emerging field of
active metadevices.
