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Ultra-high-res 100,000 dpi color printing

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Geplaatst op 13 april 2013 - 17:53

Ultra-high-res 100,000 dpi color printing

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.

To print the image, the team coated a silicon wafer with insulating hydrogen silsesquioxane and then removed part of that layer to leave behind a series of upright posts of about 95 nanometers high. They capped these nanoposts with layers of chromium, silver and gold (1, 15 and 5 nanometers thick, respectively), and also coated the wafer with metal to act as a backreflector.

Each color pixel in the image contained four posts at most, arranged in a square. The researchers were able to produce a rainbow of colors simply by varying the spacing and diameter of the posts to between 50 nanometers and 140 nanometers.

Geplaatste afbeelding
Variation in post size and spacing in the metal array alters which incoming wavelength of light (red, green or blue) is reflected back (K. Kumar et al./A*STAR)

Geplaatste afbeelding

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