METASURFACE STRUCTURE AND RELATED ARTICLE AND METHOD

There is provided a metasurface structure including a plurality of sub-wavelength structures operable to manipulate optical signal/radiation to which metasurface structure is exposed to or irradiated with. The plurality of sub-wavelength structures is arranged such that the metasurface structure is operable to display a first image based on image data embedded or encoded by the sub-wavelength structures when the metasurface structure is exposed to or irradiated with a first optical signal/radiation, and the metasurface structure is operable to display a second image based on image data embedded or encoded by the sub-wavelength structures when the metasurface structure is exposed to or irradiated with a second optical signal/radiation different from the first optical signal/radiation. The first image includes an optical-printing image and the second image includes one or more holographic images.