Overview
- The record code measures 1.98 square micrometers with a 29×29 grid of 49-nanometer pixels, surpassing the previous 5.38 µm² mark.
- It was milled by focused ion beams into a ceramic thin film, using a 15-nanometer chromium nitride writing layer on glass.
- The structure is too fine for optical microscopes and can currently be read only with an electron microscope.
- The team reports an effective density of about 130 bits per square micrometer, suggesting more than 2 terabytes could fit on an A4 sheet.
- Researchers plan to test other materials, boost writing speed, develop scalable manufacturing, and expand beyond simple QR codes for industrial use.