(a) Simulated and measured reflected images created by the angle-multiplexed metasurface illuminated under different incident angles (0° and 30°). (b) The design approach to encode two numbers by the structure design of coherent pixels and the optical setup for measuring the incident angle-controlled metasurface printing images. (c) Simulated and measured color holographic image produced by metasurface holograms with three primary color light at designed incident angles. Reproduced with permissions: (b) from [90
], Copyright 2018, Wiley-VCH; (c) from [91
], Copyright 2016, American Chemical Society.