Advanced phase change medium of over 30 GB capacity for blue laser and high-NA objective lens

Author

Yusu, Keiichiro ; Ashida, S. ; Nakamura, Naomasa ; Oomachi, Noritake ; Morishita, Naoki ; Ogawa, Akihito ; Ichihara, Katsutaro

Author_Institution

Storage Mater. & Devices Lab. Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan

fYear

2002

fDate

2002

Firstpage

413

Lastpage

415

Abstract

Advanced phase change medium of over 30GB data capacity has been proposed and the recording characteristics of the medium have been described. The medium has L-H polarity, Bi-substituted GeTe-rich pseudo-binary alloy film as the recording layer, and thin metal absorption control layer. The recording measurement was carried out by using a blue laser light source with the wavelength of 405nm and an objective lens with NA of 0.85. Both CNR and ER have been improved by the use of the Bi-substituted GeTe-rich composition. XE has been reduced by the use of the absorption control layer. The bER measurement demonstrated its capability for over 30GB data capacity.

Keywords

antimony alloys; bismuth alloys; digital versatile discs; germanium alloys; lenses; light absorption; tellurium alloys; 30 GB; 405 nm; CNR; DVDs; ER; GeSbTeBi; L-H polarity; XE; absorption control layer; advanced phase change medium; bER measurement; blue laser; carrier to noise ratio; cross-erase; erase ratio; high-NA objective lens; low-to-high polarity; recording characteristics; Absorption; Amorphous materials; Interference; Laser transitions; Lenses; Material storage; Optical films; Optical recording; Reflectivity; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Optical Memory and Optical Data Storage Topical Meeting, 2002. International Symposium on

Print_ISBN

0-7803-7379-0

Type

conf

DOI

10.1109/OMODS.2002.1028684

Filename

1028684