Title :
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
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;
Conference_Titel :
Optical Memory and Optical Data Storage Topical Meeting, 2002. International Symposium on
Print_ISBN :
0-7803-7379-0
DOI :
10.1109/OMODS.2002.1028684
