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Multi Layer Disk Design For Near Field Phase-Change Recording

Published online by Cambridge University Press:  01 February 2011

Koichiro Kishima ,
Isao Ichimura ,
Kimihiro Saito ,
Kenji Yamamoto ,
Atsushi Iida  and
Kiyoshi Osato
Koichiro Kishima
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
Isao Ichimura
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
Kimihiro Saito
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
Kenji Yamamoto
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
Atsushi Iida
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
Kiyoshi Osato
Affiliation:
Optical System Development Group, Broadband Network Company, SONY Corporation 6–7–35 Kitashinagawa, Shinagawa-ku, Tokyo, 141–0001, Japan.
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Abstract

We propose multi-layer near-field recording with using inner focus mode. The restricted conditions for multi-layer near-field recording are discussed from the viewpoint of both media structure and optical setup. One solution is presented for dual layer recording with a numerical aperture (NA) of 1.5 and a wavelength of 405 nm as a light source of GaN laser diode.

In the proposed layer structure, a Nb2O5 material has been adopted as the intermediate layer because of its high refractive index, n = 2.4, in order to prevent the decrease of beam propagation that corresponds to NA>1. Almost the same signal characteristics can be obtained from both recording layers at the air gap of 40 nm. The adjustment of focusing position and the compensation of spherical aberrations have been implemented by the combination of an expander lens unit and a liquid crystal (LC) panel in the optical setup.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 803: Symposia GG/HH – Advanced Characterization Techniques for Data Storage Materials – Phase Change and Nonmagnetic Materials for Data Storage , 2003 , HH6.1
Copyright
Copyright © Materials Research Society 2004

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References

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