Feb, 2000
Near-field phase-change optical recording of 1.36 numerical aperture
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
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- Volume
- 39
- Number
- 2B
- First page
- 962
- Last page
- 967
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1143/JJAP.39.962
- Publisher
- JAPAN J APPLIED PHYSICS
A bit density of 125 nm was demonstrated through near-field phase-change (PC) optical recording at the wavelength of 657 nm by using a supersphere solid immersion lens (SIL). The lens unit consists of a standard objective and a phi 2.5 mm SIL. Since this lens size still prevents the unit from being mounted on an air-bearing slider, we developed a one-axis positioning actuator and an active capacitance servo for precise gap control to thoroughly investigate near-field recording. An electrode was fabricated on the bottom of the SIL, and a capacitor was formed facing a disk material. This setup realized a stable air gap below 50 nm, and a new method of simulating modulation transfer function (MTF) optimized the PC disk structure at this gap height. Obtained jitter of 8.8% and a clear eye-pattern prove that our system successfully attained the designed numerical-aperture (NA) of 1.36.
- Link information
- ID information
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- DOI : 10.1143/JJAP.39.962
- ISSN : 0021-4922
- Web of Science ID : WOS:000087538700061