Paper here [1]. Two-photon lithography from Nanoscribe [2] is used to make the color-producing nanostructures. This method can make arbitrary 3D structures but

Paper here [1]. Two-photon lithography from Nanoscribe [2] is used to make the color-producing nanostructures. This method can make arbitrary 3D structures but currently has a ~100nm resolution limit and is slow---it's quite possible creating the paper's ~1 square mm teapot image took days. It's possible methods like nanoimprint lithography [3] could replicate a fabricated color patch over large areas. [1] https://repository.ist.ac.at/1028/1/NanoStructColor-Auzinger-paper.pdf https://repository.ist.ac.at/1028/1/NanoStructColor-Auzinger... [2] https://www.nanoscribe.de/en/ https://www.nanoscribe.de/en/ [3] https://en.wikipedia.org/wiki/Nanoimprint_lithography https://en.wikipedia.org/wiki/Nanoimprint_lithography