Commissariat a L'energie Atomique

Xavier Biquard

Bérangère Hyot

Bernard Andre

Pierre Desre

The invention relates to the field of optical information recording. According to the invention, an optical storage structure is proposed comprising a substrate equipped with physical marks whose geometrical configuration defines the recorded information, a superposition of three layers on top of the substrate marks, and a transparent protective layer on top of this superposition, the superposition comprising a layer of indium or gallium antimonide inserted between two ZnS/SiOdielectric layers. The antimonide layer has a polycrystalline structure with an average crystal grain size between 5 and 50 nanometers. The non-linear behavior of the superposition of three layers under the read laser makes it possible to read information having a size below the theoretical resolution of the reading system.

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Tullins, France

Xavier Biquard