small plans: nanotechnology for the building industry

Friday, November 04, 2005

3D barcodes to identify stolen valuables

A microscopic cubic barcode that stores encrypted information has been developed by a team at the National Physical Laboratory at Teddington, near London. The cube, made of silicon coated with a 100-nanometre-thick layer of transparent plastic, can be attached to hard surfaces using adhesive, or woven into the canvas of paintings. To create the barcode, an electron-beam lithograph drills 90,000 small squares into the plastic coat of each face at five different depths. The position and depth of each square is unique, so data can be encrypted using a key-based code and stored digitally. more @