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Commercial laser printers typically produce pin-sharp images with spots of ink about 20 micrometers apart, resulting in a resolution of 1,200 dots per inch (dpi).
By shrinking the separation to just 250 nanometers — 80 times smaller, a research team at A*STAR can now print images at an incredible 100,000 dpi, the highest possible resolution for a color image.
These images could be used as minuscule anti-counterfeit tags, for steganography (hidden messages in images) or nanoscale optical filters or to encode high-density data.