There is a limit to the resolution of an image that can be perceived. Researchers have now demonstrated a printing technique that operates at this limit. Any lower resolution will produce a blurred image as light refracts between the pixels forming the picture.
To print an image of the highest perceivable resolution, stacks of nano-scale materials are built up in three dimensions then capped with gold or silver to produce a full gamut of colours through structural colour. The image below has been produced with this technique: in reality, this image is less than the width of a typical human hair.
If you’re up for along read, the entire paper is available here.
