This patent discloses a metasurface structure and method designed to integrate a multi-color optical-printing image with multiple encrypted monochromatic holographic images in a single device, addressing the limitations of prior art.

This invention provides a metasurface structure and method for encoding information using phase-change materials (PCMs), specifically vanadium dioxide (VO₂), to achieve thermally tunable holography in the visible spectrum.

In our technology, introducing fluorescent pigments into commercially available white coatings competes with TiO2 on UV absorption and re-emit part of the absorbed UV light so as to further reduce the net heat gain from solar irradiation and also make the cooling coatings colorful.

We invented a generic thermal management strategy by using an ultra-thin, soft, radiative-cooling interface (USRI), which allows to cool down the temperature in skin electronics through both radiative and non-radiative heat transfer, achieving temperature reduction greater than 56 °C.