Team aims world’s smallest QR code at long-term data storage

By shrinking a QR code to the dimensions of a microbe, researchers from the Vienna University of Technology (TU Wien) and the German-Austrian start-up Cerabyte have proven that the way forward for the digital world may depend upon ceramics, one of many oldest and most sturdy supplies recognized to people.

On December 3, the staff secured a Guinness World Record for the world’s smallest QR code. Spanning simply round 2 sq. micrometres, the code is about one-third the dimensions of the earlier file holder and smaller than a single bacterium. While the picture is itself an achievement, the staff’s strategies additionally supply a brand new approach for people to retailer their digital legacy.

The challenge was led by Paul Mayrhofer, head of the Institute of Materials Science and Technology at TU Wien, together with researchers Erwin Peck and Balint Hajas. And they have been motivated by data rot: the inevitable decay of magnetic and digital storage media.

Current storage options like exhausting drives and magnetic tapes final round 10 to 30 years. They require an influence provide to function and be cooled, and have to have the data they retailer to be copied to new {hardware} to stop loss. The TU Wien staff explored ceramic-based storage as a everlasting and zero-energy different.

To create the code, the researchers skipped conventional printing applied sciences in favour of atom-scale engineering, particularly a method referred to as targeted ion beam milling.

They began with a glass substrate coated in a 15-nm-thick layer of chromium nitride, a ceramic usually used to coat industrial slicing instruments as a result of it’s very exhausting and excels at resisting warmth and corrosion. Using a stream of electrically charged atoms as a knife, the researchers carved the QR code straight into the ceramic movie.

Each particular person pixel within the 29 x 29 grid measured solely 49 nm. Because these pixels have been roughly ten-times smaller than the wavelength of seen gentle, the code is bodily not possible to see with a normal optical microscope. To confirm the work, the staff used a calibrated scanning electron microscope at the University of Vienna, which makes use of electrons as an alternative of sunshine to resolve small constructions.

The effort additionally proved that ceramic storage may attain an data density of 130 bits per sq. micrometre, that means a single A4-sized ceramic sheet may maintain greater than 2 TB of data. This is at present between the roughly 20 bits/μm² of LTO-9 magnetic tape and 1,500-3,000 bits/μm² of contemporary exhausting drives.

Unlike plastic-based tapes or magnetic disks, chromium nitride is chemically inert and bodily steady and might survive fireplace, water, and millennia with out degrading. And as a result of the data has been etched relatively than saved in a configuration of electromagnetic states, it doesn’t want energy to persist, probably sidestepping the necessity for data centres with giant carbon footprints.

It does nevertheless require a robust and costly microscope to retrieve, though the staff has mentioned it’s growing high-speed laser writing and optical studying programs for industrial use for this objective.

This feat is akin to Microsoft’s Project Silica, the place researchers are encoding data in layers of glass utilizing high-speed lasers, once more with the goal of growing high-density data storage that may final for a very long time.