Super-resolution optical disc with high readout stability using a zinc oxide thin film

被引：15

作者：

Yamamoto, M ^{[1
]}

Mori, G ^{[1
]}

Tajima, H ^{[1
]}

Takamori, N ^{[1
]}

Takahashi, A ^{[1
]}

机构：

[1] Sharp Co Ltd, Corp R&D Grp, Devices Technol Res Labs, Tenri, Nara 6328567, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2004年 / 43卷 / 7B期

关键词：

optical ROM disc; super-resolution; high readout stability; zinc oxide thin film; blue laser;

D O I：

10.1143/JJAP.43.4959

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a new super-resolution read-only-memory (ROM) disc with high readout stability using a zinc oxide (ZnO) thin film. A ZnO film utilized in our experiment showed a change in optical constant depending on temperature. By applying this characteristic to a ROM disc, we obtained a linear bit density two times higher than that of conventional ROM discs in our experimental optical pickup system with a 408-nm-wavelength laser and a 0.65-numerical-aperture (NA) objective lens. The readout stability was improved by employing a Si film. A high readout cyclability of more than 1.0 x 10(5) was obtained. Moreover, the super-resolution readout function was confirmed in another optical pickup system with a 408-nm-wavelength laser and a 0.85-NA objective lens.

引用

页码：4959 / 4963

页数：5

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