The microscopic Quick Response (QR) code covers an area of just 1,977 square micrometers, making it three times smaller than the previous record holder and smaller than some bacterial cells or atmospheric pollution particles. The seven scientists who created it entered the Guinness Book of Records, but the exact date of this achievement remains unclear. The code is so tiny that a phone would need an electron microscope to scan it, though the specifics of that scanning process are not detailed.
The research team was led by scientists from the Vienna University of Technology (TU Wien), in collaboration with the data storage technology company Cerabyte. According to Paul Mayrhofer, a materials scientist at TU Wien, the structure of the code is so detailed that it cannot even be observed with an optical microscope. In nanotechnology, creating structures at the micrometer or even atomic level is no longer unusual, but the difficult part was producing a code that is stable and readable despite its extremely small size.
We write information into stable, inert materials that can withstand the passage of time and remain fully accessible to future generations.
Tests showed that the code functions normally, though what specific data it stores and how it is encoded have not been disclosed. The key to creating such a small QR code was printing it on a thin ceramic membrane, designed for coating high-performance cutting tools. By focusing ion beams on this material, the team synthesized the QR code with pixels just 49 nanometers in size.
The pixels are about ten times smaller than the wavelength of visible light, meaning the code is completely invisible to the human eye. Beyond the record, this technology opens prospects for a new generation of highly durable data storage systems. According to CNN Greece, Alexander Kirnbauer, a materials scientist at TU Wien, described the approach as writing information into stable, inert materials that can withstand the passage of time and remain fully accessible to future generations.
The team estimates that, with this method, over 2 terabytes of data could be stored on an A4-sized sheet of paper. Ceramic storage may have a smaller carbon footprint compared to today's media, but the exact environmental benefits and carbon footprint reduction compared to current storage media are not specified. Practical applications and the commercial availability timeline for this technology remain uncertain.