  Holographic technologies have the potentiality to impact our everyday life in
many sectors including science, education, entertainment, art, and healthcare.
Although holographic screens and projectors are part of common imagination
since long time, they are still at initial stages of development and
integration. Recent achievements of metasurface and flat optics research gave
an unprecedented strength to this field, overcoming critical aspects as
efficiency, size and flexibility of conventional optics and liquid crystal
technologies. However, although diffractive and metasurface holographic
projectors with advanced functionalities and improved efficiencies are
continuously reported, they are static devices, requiring demanding,
burdensome, and irreversible manufacturing processes. Here we report an
all-optical and single-step lithographic framework for the fabrication of
diffractive holographic projectors directly on the surface of a photo-morphable
polymer film. Real-time optimization during the accurate surface patterning and
fully structural reconfigurability allowed for the first prototype of a fully
reprogrammable pixel-less morphological projector, opening new routes for
holographic image displaying and optical data sharing.
