High-Transmittance Phase-Change Media with TiO₂ Film for Rewritable Dual-Layer Blu-ray Discs

• Nishihara Takashi

  Storage Media Systems Development Center, Matsushita Electric Industrial Co., Ltd.

• Kojima Rie

  Storage Media Systems Development Center, Matsushita Electric Industrial Co., Ltd.

• Miyagawa Naoyasu

  Storage Media Systems Development Center, Matsushita Electric Industrial Co., Ltd.

• Yamada Noboru

  Storage Media Systems Development Center, Matsushita Electric Industrial Co., Ltd.

書誌事項

タイトル別名

• High-Transmittance Phase-Change Media with TiO2 Film for Rewritable Dual-Layer Blu-ray Discs

抄録

We have developed a semitransparent layer structure that is ideally suited to the laser-incident-side (front-side) recording layer of a rewritable dual-layer Blu-ray Disc (BD-RE). A TiO₂ top film and a memory film of GeTe–Sb₂Te₃ characterize this layer structure. The TiO₂ film has a large refractive index, which works to increase the transmittance of the entire recording layer to more than 50%. It simultaneously increases the reflectivity contrast, defined by (R_cry−R_amo)⁄(R_cry+R_amo), where R_cry and R_amo (R_cry>R_amo) are the reflectivities of the optical disc in the crystalline and amorphous parts, respectively. The GeTe–Sb₂Te₃ memory film has optical constants that are appropriate for balancing the transmittance between the crystalline part (T_cry) and the amorphous part (T_amo) in the laser wavelength region of approximately 405 nm. Our experimental dual-layer disc shows high transmittances of T_cry=51.6% and T_amo=52.0% and a high reflectivity contrast of 0.71 in the laser-incident-side layer. Dynamic examination showed that both recording layers have a good jitter value, satisfying the BD-RE specifications; more specifically, the laser-incident-side layer jitter value is 7.4% (spec.: 8.5%) and the back-side layer jitter value is 6.4% (spec.: 6.5%) through the front-side layer.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 44 (5A), 3037-3041, 2005

  The Japan Society of Applied Physics

キーワード

• dual-layer
• rewritable
• Blu-ray disc
• TiO<SUB>2</SUB> film
• high transmittance
• 50 GB

詳細情報

• CRID: 1390001206265974016
• NII論文ID: 210000057890
• NII論文ID: 10015706502
• NII論文ID: 130004533982
• NII書誌ID: AA10457675
• DOI: 10.1143/jjap.44.3037
• ISSN: 13474065
• ISSN: 00214922
• ISSN: http://id.crossref.org/issn/13474065
• NDL書誌ID: 7311230
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7311230
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.44.3037
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.44.3037/pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可