28 June 1999 Near-field phase-change optical recording over 1.2 numerical aperture
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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).
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Koichiro Kishima, Koichiro Kishima, Isao Ichimura, Isao Ichimura, Kenji Yamamoto, Kenji Yamamoto, Kiyoshi Osato, Kiyoshi Osato, Yuji Kuroda, Yuji Kuroda, Kimihiro Saito, 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); doi: 10.1117/12.997612; https://doi.org/10.1117/12.997612
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