| 摘要 |
An optical recording disk capable of recording/reproducing, as desired, data constituted by recording mark rows including recording marks and blank areas and significantly increasing a recording capacity even when the lengths of these recording marks and the lengths of blank area between adjacent recording marks are less than a resolution limit. An optical recording disk so constructed as to receive and reproduce data by being irradiated with a laser beam L, characterized in that the disk includes a laminate formed by a decomposition layer (5) and a light absorbing layer (7) mainly containing platinum oxide with a second dielectric layer (6) held between them, and a hollow is formed and platinum fine particles deposit in a hollow when irradiated with a laser beam L to thereby form a recording mark in the decomposition layer (5), platinum fine particles having particle size of 2 to 15 nm.
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