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High density near field readout over 50 GB capacity using a solid immersion lens with high refractive index

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5 Author(s)
Shinoda, M. ; Opt. Disc Dev. Div., Sony Corp., Tokyo, Japan ; Saito, K. ; Kondo, T. ; Ishimoto, T.
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We have already reported a high density near field readout system with a GaN blue laser of 405 nm wavelength and an optical pick-up of an effective numerical aperture (NA) of 1.4. A readout performance of the near field readout system depends on the optical parameters, namely the NA of a solid immersion lens (SIL) and the laser wavelength. With a relative high refractive index glass material, we can design a SIL with higher NA. In this study, by using a glass with the refractive index of 2.08, we developed the optical pick-up with the effective NA of 1.8. We could observe a clear eye pattern for 50 GB capacity ROM in a φ120 mm single side disc.

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Optical Memory and Optical Data Storage Topical Meeting, 2002. International Symposium on

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