| 摘要 |
There is provided an optical recording disc capable of recording/reproducing data constituted of a recording mark array including recording marks and blank areas even when the length of the recording marks or the length of the blank area between adjacent recording marks is shorter than a resolution limit, capable of significantly increasing the recording capacity and capable of enhancing C/N ratio of a reproduction signal. The optical recording disc comprises a substrate (2), a third dielectric layer (3), a light absorption layer (4), a second dielectric layer (5), a decomposition reactive layer (6) principally comprising a platinum oxide, a first dielectric layer (7), and a light transmitting layer (8). The decomposition reactive layer (6) has a thickness of 2-20 nm. The platinum oxide in the decomposition reactive layer (6) is decomposed into platinum and oxygen when the decomposition reactive layer (6) is irradiated with a laser beam (20) through the light transmitting layer (8). A cavity is formed by oxygen gas thus produced, and a recording mark is formed on the decomposition reactive layer (6) by fine platinum particles deposited in the cavity.
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