| 摘要 |
A recording layer 3 including shape-memory alloy thin films 311, 312 and a hydrogen storage alloy thin film 32, a dielectric thin film 4, and a reflective thin film 5 are stacked on a surface of a substrate 2 in the described order. Irradiation of recording light causes the hydrogen storage alloy thin film 32 to release hydrogen gas and contract in volume at the same time, creating a space 321 in the film. The shape-memory alloy thin films 311, 312 are deformed by the gas pressure in space 321, allowing space 321 to enlarge its thickness. Upon exposure to erasing light, shape-memory alloy thin films 311, 312 tend to restore their shape prior to deformation, applying pressure to the hydrogen gas in space 321 so that the hydrogen gas is occluded again and space 321 is substantially extinguished. Reversible release and occlusion of hydrogen gas enables to rewrite the recording information.
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