Metamaterials Revolutionize Holography's Spectrum Possibilities.
Researchers at Pohang University of Science and Technology have developed a method for generating meta-holograms in both the visible and ultraviolet spectral regions, overcoming prior limitations. They also devised a way to encode two distinct holographic phase profiles onto a single metasurface, leveraging polarization characteristics and liquid crystal, leading to potential applications in security technologies such as anti-counterfeiting measures, identifications, and passports.