ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
35.01
Session ID : MMS2011-6/CE2011-6
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Host: ITE

One SIL Head Recording/Reading on a Rewritable Dual-Layer Optical Disk Having High-index Cover and Separation Layers
Haruhiko HABUTA, Kazuya HISADA, Kenji NARUMI, Takashi MIHARA, Kosei SANO, Katsuhiko HAYASHI, Yasuhiro TANAKA, Teruhiro SHIONO, Shigeru FURUMIYA, Masahiro BIRUKAWA, Noboru YAMADA
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Keywords: SIL, Near-field, Dual-layer optical disk, Rewritable, Phase-change, High-index cover layer, Beam expander
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Abstract

We have developed a dual-layer rewritable optical disk with high-index (n=1.8) cover and separation layers and first demonstrated near-field recording/reading for both L0 and L1 layers with single SIL (Solid Immersion Lens) optical head. The surface smoothness of the disk and the stability of a gap servo were improved by applying a new forming process of the high-index cover layer of the disk. A beam expander composed of three lenses enabled focusing both L0 and L1 recording layers without exchanging SIL head. The recording characteristics at the capacity of 150GB were confirmed.

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© 2011 The Institute of Image Information and Television Engineers
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