Near-field optical recording on a pre-grooved phase-change disk in the blue-violet

Citation
I. Ichimura et al., Near-field optical recording on a pre-grooved phase-change disk in the blue-violet, JPN J A P 1, 40(3B), 2001, pp. 1821-1826
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
3B
Year of publication
2001
Pages
1821 - 1826
Database
ISI
SICI code
0021-4922(200103)40:3B<1821:NOROAP>2.0.ZU;2-3
Abstract
Near-field optical recording was implemented on a pre-grooved phase-change disk by using a phi 1 mm superhemispherical solid immersion lens (SIL) of 1 .5 numerical aperture. The SIL unit was mounted on a two-axis actuator for enabling both gap-height and tracking controls. The gap height was precisel y adjusted with a capacitance formed between the SIL and disk materials. Gr oove structures were fabricated on a glass substrate by a reactive-ion-etch ing (RIE) process and flattened with spin-on-glass (SOG) coating for obtain ing reliable push-pull tracking error signals. The phase-change layer stack was optimized by a vector diffraction analysis in order to maximize evanes cent coupling at the gap height as small as 50 nm. A bit density of 80 nm w as demonstrated on the land of a pre-grooved disk at the wavelength of 407 nm.