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Proceedings Paper

Near-field phase-change optical recording over 1.2 numerical aperture
Author(s): Koichiro Kishima; Isao Ichimura; Kenji Yamamoto; Kiyoshi Osato; Yuji Kuroda; Kimihiro Saito
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Paper Abstract

Recently, solid immersion lenses (SILs) have yielded a great interest in near-field optical data storage. However, convincing data on areal recording density have yet to be reported. The difficulty is attributed to the fact that an air-bearing slider needs to be kept optically contacted and also that a tiny SIL is vulnerable to aberrations caused by an air gap between a lens and a disk. The air-bearing system cannot easily achieve the condition above because its linear velocity changes the air gap. We have developed a new SIL device mounted on an actuator, which allows the air gap to be varied arbitrarily and enables optical contact independent of disk rotation. The obtained eyepattern of (l,7)-coded data on a phase-change disk demonstrates near-field recording over 1.2- numerical-aperture (NA).

Paper Details

Date Published: 28 June 1999
PDF: 3 pages
Proc. SPIE 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999, 386435 (28 June 1999); doi: 10.1117/12.997612
Show Author Affiliations
Koichiro Kishima, Sony Corp. (Japan)
Isao Ichimura, Sony Corp. (Japan)
Kenji Yamamoto, Sony Corp. (Japan)
Kiyoshi Osato, Sony Corp. (Japan)
Yuji Kuroda, Sony Corp. (Japan)
Kimihiro Saito, Sony Corp. (Japan)


Published in SPIE Proceedings Vol. 3864:
Joint International Symposium on Optical Memory and Optical Data Storage 1999
Shigeo R. Kubota; Ryuichi Katayama; Douglas G. Stinson, Editor(s)

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