HIGH RESOLUTION OPTICAL INFORMATION STORAGE MEDIUM

摘要

The invention relates to the optical storage of information. The invention provides a high-resolution optical information storage structure that comprises a substrate (10) with physical marks having a geometrical configuration that defines the recorded piece of information, a stack of three layers above the marks of the substrate, and a transparent protection layer above said stack, the stack including an indium or gallium antimonide layer (14) provided between two ZnS-SiO₂ dielectric layers (12, 16). The information can be pre-recorded in the substrate with a resolution (dimensions and spacing) higher than the theoretical reading resolution allowed by the wavelength of the reading laser. The behaviour non-linearity of the three-layers stack enables reading information if the laser power is correctly selected.