We developed solid immersion lenses made of KTaO3 mono-crystal. The refractive index of KTaO3 is 2.382 at the wavelength of 405 nm. By utilizing KTaO3 as a raw material of a solid immersion lens, we could design an effective numerical aperture of 2.20. We could observe a eye pattern of 150 GB capacity with 130 nm track pitch and 47.6 nm bit length. The areal density is 104.3 Gbit/in2.
© 2005 Optical Society of America
(210.0210) Optical data storage : Optical data storage
(210.4770) Optical data storage : Optical recording
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.3630) Optical design and fabrication : Lenses
M. Shinoda, K. Saito, T. Kondo, M. Furuki, M. Takeda, A. Nakaoki, M. Sasaura, and K. Fujiura, " High-Density Near-Field Readout Using a Solid Immersion Lens of KTaO3," in International Symposium on Optical Memory and Optical Data Storage, OSA Technical Digest Series (Optical Society of America, 2005), paper WD3.
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