ARCHIVAL RECORDING MEDIA FOR DIGITAL DATA STORAGE USING LOW POWER RADIATION

摘要

Embodiments show a recording medium (10) adapted for recording and read-out with relatively low-power laser means (212) to write digital data "bits" (v) (as reflectance changes) for high density computer storage. One preferred medium comprises a disk support (12) having an "anti-reflective" surface (1-AR) on which is laid a gold "information layer" (15) adapted to absorb recording radiation (from laser beam) (212 a,b,c) and so "write" the bits. The antireflective surface (1-AR) may comprise a high-reflectance surface, like an aluminum film, covered with a transparent (to beam) dielectric "spacer" (14) like SiO2. The gold absorber layer (15) exhibits surprisingly high sensitivity, apt for low power recording, and extended archival stability; more surprisingly, it appears to be formed without any evidence of the usual "pit formation" or other deformation and by relatively slight laser heating, well below the melting point.