Printed Nb 2 O 5 Metasurfaces for Ultraviolet‐Visible Chiro‐Optical Holography

Abstract The development of printable high‐index materials that operate reliably across the UV–vis spectrum is critical for advancing large‐area, high‐performance metasurfaces. While the concept of particle‐embedded resin (PER) enables single‐step fabrication of high‐index structures, most reported PERs exhibit limited transparency or refractive index in the UV region. In this study, a broadband chiral metahologram is reported enabled by a niobium pentoxide (Nb 2 O 5 ) PER that exhibits a high refractive index and low absorption across 375–635 nm. The metasurfaces are fabricated in a single step using nanoimprint lithography, eliminating the need for etching or deposition. A particle swarm optimization (PSO) algorithm is employed to refine the geometric phase design for efficient polarization conversion. The resulting metasurfaces selectively reconstruct holographic images under left‐circularly polarized (LCP) incidence, while suppressing those under right‐circularly polarized (RCP) illumination. Experimental validation confirms high‐fidelity reconstruction across the UV–vis range, accompanied by strong polarization‐dependent holographic response governed by phase modulation. This work establishes a scalable platform for polarization‐encoded photonics and suggests applications in optical security, biosensing, and spin‐based information display.