Abstract
Super-resolution near-field structure (super-RENS) technology was applied to the high definition digital versatile disk (HD DVD) based system that retrieves signals from the polycarbonate substrate side using a blue laser. We used an optics with a laser wavelength (λ) of 405 nm and a numerical aperture (NA) of 0.65, and have obtained high carrier-to-noise ratios (CNRs) of 45 dB at a 100 nm mark length and 40 dB at 60 nm, which are smaller than the resolution limit (λ/4NA=156 nm). The results demonstrate that the technology can also be used in the HD DVD-based system. We discussed how well the CNR is obtained below the resolution limit when this technology is used in the DVD-, Blu-ray Disc- and HD DVD-based systems. Comparison of the best results to date strongly suggests that the difference between these systems simply comes from their λ and NA.
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