Information recording process for producing the same and optical information recording and reproducing device

摘要

An information recording medium of the present invention includes a recording portion capable of storing information three-dimensionally. The recording portion ( 3 ) includes at least one recording layer ( 1 a to 1 f), and the recording layer ( 1 a to 1 f) contains titanium oxide. It is preferable that titanium oxide is at least one kind of an anatase type and a brookite type. The recording layer ( 1 a to 1 f) may be substantially made of titanium oxide, and may contain titanium oxide and a low refractive-index material having a refractive index smaller than that of titanium oxide.