Optical storage medium with a mask layer providing a super resolution near field effect, and respective manufacturing method

Method for manufacturing an optical storage medium with the subsequent steps of

• providing a substrate layer, on which a read-only data layer with a pit structure is arranged,
• providing a dielectric layer, having a thickness, which changes in dependency of the pit structure,
• providing a mask layer on the dielectric layer, wherein the mask layer comprises nanoparticles and
• providing a cover layer as a protection layer on the mask layer.

Optical storage medium comprising

• a substrate layer,
• a read only data layer comprising a pit structure and arranged on the substrate layer,
• a mask layer comprising nanoparticles for providing a super resolution near field effect, and
• a dielectric layer arranged between the data layer and the mask layer, wherein
• the dielectric layer has a thickness, which changes in dependency of the pit structure.