Near-field phase-change optical recording of 1.36 numerical aperture

Citation
I. Ichimura et al., Near-field phase-change optical recording of 1.36 numerical aperture, JPN J A P 1, 39(2B), 2000, pp. 962-967
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
39
Issue
2B
Year of publication
2000
Pages
962 - 967
Database
ISI
SICI code
0021-4922(200002)39:2B<962:NPORO1>2.0.ZU;2-1
Abstract
A bit density of 125 nm was demonstrated through near-field phase-change (P C) optical recording at the wavelength of 657 nm by using a supersphere sol id 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 actua tor and an active capacitance servo for precise gap control to thoroughly i nvestigate near-field recording. An electrode was fabricated on the bottom of the SIL, and a capacitor was formed facing a disk material. This setup r ealized a stable air gap below 50 nm, and a new method of simulating modula tion transfer function (MTF) optimized the PC disk structure at this gap he ight. Obtained jitter of 8.8% and a clear eye-pattern prove that our system successfully attained the designed numerical-aperture (NA) of 1.36.