Optics and Photonics: Miniaturization of Diffusers for New Applications

 https://www.kit.edu/kit/english/pi_2021_118_optics-and-photonics-miniaturization-of-diffusers-for-new-applications.php

"Optical component based on a metamaterial... a diffuser, a disk that scatters light... made from silicon nanoparticles... specifically control the direction, color, and polarization of light... sweet spot for the amount of disorder that leads to perfect diffusion... equally bright from all directions... scatter light of a specific color and let other wavelengths pass undisturbed... transparent screens... viewed from both sides, holographic projectors, or augmented reality"