Near-field phase-change optical recording over 1.2 numerical aperture

Koichiro Kishima; Isao Ichimura; Kenji Yamamoto; Kiyoshi Osato; Yuji Kuroda; Kimihiro Saito

doi:10.1117/12.997612

28 June 1999 Near-field phase-change optical recording over 1.2 numerical aperture

Koichiro Kishima, Isao Ichimura, Kenji Yamamoto, Kiyoshi Osato, Yuji Kuroda, Kimihiro Saito

Proceedings Volume 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999; 386435 (1999) https://doi.org/10.1117/12.997612
Event: Optical Data Storage, 1999, Kauai, HI, United States

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).

Citation Download Citation

Koichiro Kishima, Isao Ichimura, Kenji Yamamoto, Kiyoshi Osato, Yuji Kuroda, and Kimihiro Saito "Near-field phase-change optical recording over 1.2 numerical aperture", Proc. SPIE 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999, 386435 (28 June 1999); https://doi.org/10.1117/12.997612

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