Patent ID: 8611202

Claim:
Optical storage medium comprising a substrate layer, a data layer arranged on the substrate layer, a first nonlinear layer with a first super-resolution structure arranged above the data layer, a second nonlinear layer with a second super-resolution structure arranged above the first nonlinear layer, a first dielectric layer disposed between the substrate layer and the first nonlinear layer, a second dielectric layer disposed between the first and the second nonlinear layer and a third dielectric layer disposed between the cover layer and the second nonlinear layer, wherein the first nonlinear layer comprises a semiconductor material being one of the III-V semiconductor family and having an increased reflectivity when irradiated with a laser beam, and the second nonlinear layer comprises a chalcogenide alloy as a phase-change material showing an increased transparency when irradiated with a laser beam, for providing a thermal protection for the material of the first nonlinear layer.