DATA STORAGE MEDIUM AND METHOD OF READING THIS MEDIUM

摘要

The invention relates to a data storage medium (10) characterized in that it comprises a substrate based on diamond (30) comprising NV centres inserted into a crystalline unit cell of said substrate. The NV centres are able to emit a light wave at a fluorescence wavelength when the substrate is illuminated by a light source at an excitation wavelength able to excite the fluorescence of the NV centres, the fluorescence wavelength being distinct from said excitation wavelength. The substrate comprises residual NV centres (31) in a given concentration and a plurality of distinct elementary data storage areas (33) that can be altered so as to modify the number of NV centres, defining two distinct states depending on the data stored and able to be distinguished, a first unmodified state (331) where the number of NV centres is equal to the number of residual NV centres present in the area, a second modified state (332) where the number of NV centres comprises a given number of additional NV centres (32) implanted in the area; the two numbers being distinct.