A research team led by Professor Junsuk Rho at POSTECH (Pohang University of Science and Technology) has developed a secure hologram platform that operates solely based on the wavelength of light and the spacing between metasurface layers. The technology makes hacking and counterfeiting virtually impossible, and is expected to be widely adopted for security cards, anti-counterfeiting, and military communications. The paper is published in the journal Advanced Functional Materials.