We report the signal characteristics of a super-resolution near-field structure (super-RENS) disk in a blue laser system (laser wavelength, 405 nm; numerical aperture (NA), 0.85). By introducing a new structure for the blue laser system, a 42.5 dB carrier to noise ratio (CNR) at a 50-nm-mark-length-signal (which is equivalent to a 75 GB capacity with a 0.32 micrometer track pitch and a 1–7 modulation code (Blu-ray disc (BD) format)) and a much higher readout-stability were obtained. Transmission electron inicroscope (TEM) image analysis revealed that the new blue structure has clear diffusion protection barriers produced by continuous Pt particles, which is related to higher CNR and readout stability characteristics.
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Kim et al. (2004) studied this question.
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