Optical information recording medium, manufacturing method of the same and optical information recording and reproducing apparatus

摘要

An optical information recording medium includes at least a reflecting layer, an optical information recording layer, a super-resolution layer and a protective layer. The super-resolution layer is a thin layer whose an optical constant changes nonlinearly due to a red shift of its band gap, and made of solid solution, compound or mixture of metal oxides containing two or more types of metal ions of the same valence. Ion radius unconformity DeltaR=|(RMi-RMj)/RMj| between ion radii RMi and RMj of two types of metal ions Mi and Mj arbitrarily selected from the two or more types of metal ions is 8% or less. The difference DeltaE=Eg-E between band gap energy Eg of the mixture of the metal oxides and energy E corresponding to a wavelength of the laser beam is a more 0.4 or less 1.4 eV.