Signal Characteristics of Super-Resolution Near-Field Structure Disk in Blue Laser System

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  • Kim Jooho
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Hwang Inoh
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Kim Hyunki
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Yoon Duseop
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Park Insik
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Shin Dongho
    Digital Media R&D Center, SAMSUNG ELECTRONICS CO., LTD
  • Park Yunchang
    Analytical Engineering Center, Samsung Advanced Institute of Technology
  • Tominaga Junji
    Center for Applied Near-Field Optics Research, National Institute of Advanced Industrial Science and Technology (AIST)

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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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