High-density near-field readout over 100-GB capacity using a solid immersion lens with NA of 2.05

Masataka Shinoda; Kimihiro Saito; Tsutomu Ishimoto; Takao Kondo; Ariyoshi Nakaoki; Motohiro Furuki; Minoru Takeda; Masanobu Yamamoto

doi:10.1117/12.533118

16 September 2003 High-density near-field readout over 100-GB capacity using a solid immersion lens with NA of 2.05

Masataka Shinoda, Kimihiro Saito, Tsutomu Ishimoto, Takao Kondo, Ariyoshi Nakaoki, Motohiro Furuki, Minoru Takeda, Masanobu Yamamoto

Author Affiliations +

Proceedings Volume 5069, Optical Data Storage 2003; (2003) https://doi.org/10.1117/12.533118
Event: Optical Data Storage 2003, 2003, Vancouver, Canada

Abstract

We have achieved high density near field readout of a 100 GB capacity (69.5 Gbit/in²) disc by using a solid immersion lens with numerical aperture of 2.05. In order to realize the solid immersion lens wtih numerical aperture of 2.05, the solid immersion lens was made from Bi₄Ge₃O₁₂ mono-crystal. The refractive index of Bi₄Ge₃O₁₂ is 2.23 at the wavelegnth of 405 nm. A conventional optical pick-up actuator with the solid immersion lens was used for the near field optical disc system. We confirmed that the near field readout system is promising method of realizing a high density optical disc system.

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Masataka Shinoda, Kimihiro Saito, Tsutomu Ishimoto, Takao Kondo, Ariyoshi Nakaoki, Motohiro Furuki, Minoru Takeda, and Masanobu Yamamoto "High-density near-field readout over 100-GB capacity using a solid immersion lens with NA of 2.05", Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); https://doi.org/10.1117/12.533118

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