We confirmed the feasibility of a 16-layer write once disc based on Blu-ray Disc optics that was fabricated with
inorganic recording material Bi-Ge-O. The total capacity of the disc achieved 400 GB and 512 GB per single disc side
with BD 1x recording speed utilizing conventional BD technique.
Selecting a binary compound (Sb-Te, Zn-Sb and Ge-Te) with its composition at around a eutectic point generated a
better super-resolution effect. The thickness optimization of the super-resolution readout layer was also effective for the
property improvement. The temperature estimation indicated thinner the layer thickness is better as far as the readout
laser can easily increase its temperature.
We have succeeded in developing 6-layer write once disc for Blu-ray Disc system with 150 GB capacity per single side disc by use of a novel recording material: germanium oxide doped bismuth peroxide. By optimizing the compositions of the recording films and the layer structure, the jitters of less than 8.0% at the user data recording rate of 72 Mbit/sec were obtained by the application of the write power of less than 16 mW. The write power is low enough to use the commercially available blue laser diodes.
KEYWORDS: Nonlinear optics, Near field, Super resolution, Oxides, Optical storage, Near field optics, Metals, Particles, Signal detection, Light scattering
Nonlinear properties and response mechanisms of PtO2 and PdO1.1 mask layers for optical data storage with super-resolution near-field structure were investigated. The results obtained from Z-scan measurement was supported by microscopic observation studies. The 5.1 mW and 6.5 mW, respectively, as the decomposition threshold of the PdO1.1 and PtO2 for leading to metallic nano-particles were confirmed. The scanned PdO1.1 and PtO2 mask samples could be retrieved at less than their own threshold values. It was also found for the PdO1.1 and PtO2 mask samples that the nonlinear optical response not only came from the metallic particles but also from the bubble deformation.
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