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Transmitted signal detection of optical disks with a superresolution near-field structure

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5 Author(s)
Nakano, Takashi ; Advanced Optical Memory Group, National Institute for Advanced Interdisciplinary Research (NAIR), 1-1-4 Higashi, Tsukuba, Ibaraki 305-8562, Japan ; Sato, Akira ; Fuji, Hiroshi ; Tominaga, J.
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We observed transmitted signals of phase change marks recorded in super-resolution near-field structure (super-RENS) disks under high speed disk rotation. The observed minimum mark size was 81 nm and the carrier to noise ratio was about 6 dB at a constant linear velocity of 4.8 m/s. The mark size was far beyond the diffraction limit of an optical pickup with a wavelength of 635 nm and a numerical aperture of 0.6. It was clear that near-field scattering actually occurred in super-RENS disks. © 1999 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:75 ,  Issue: 2 )