Advanced dual-layer phase-change optical disc

Isao Satoh; Noboru Yamada

doi:10.1117/12.510287

9 April 2003 Advanced dual-layer phase-change optical disc

Isao Satoh, Noboru Yamada

Proceedings Volume 5060, Sixth International Symposium on Optical Storage (ISOS 2002); (2003) https://doi.org/10.1117/12.510287
Event: Sixth International Symposium on Optical Storage (ISOS 2002), 2002, Wuhan, China

Abstract

Multi-layer optical recording is a promising technology for increasing a disc capacity using an optical pickup identical to that used for a single-layer optical disc. A capacity of 25 GB - 50 GB is required to record 2 - 4 hours HD-TV program. In this paper, the physical format of the dual-layer phase-change optical disc is studied and experimental results of an advanced dual-layer phase-change optical disc, of which first layer is characterized by a transmittance-balanced structure and prepared by a new replication process, are shown and discussed. The transmittance-balanced structure disc is realized by adopting Ge(Sn)-Sb-Te film that has appropriate optical constants and optimizing the thickness of dielectric layers. The signal of the second-layer in the transmittance-balanced structure disc is able to read and write without any influence of the first-layer. A capacity of over 50 GB is demonstrated by the transmittance-balanced structure disc.

Citation Download Citation

Isao Satoh and Noboru Yamada "Advanced dual-layer phase-change optical disc", Proc. SPIE 5060, Sixth International Symposium on Optical Storage (ISOS 2002), (9 April 2003); https://doi.org/10.1117/12.510287

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