Bit-by-bit detection on super-resolution near-field structure disk with platinum oxide layer

Bit-by-bit detection at a recording density of 0.11 mum pits is achieved on a super-resolution near-field structure (super-RENS) disk with a platinum oxide layer. Pits and spaces are arranged as a recording pattern for pit position recording. The pattern is recorded on the disk with using a 635-nm-wavelength laser and an objective lens with a 0.6 numerical aperture. After recording using laser pulses with pre- and post-heating, the pattern is correctly. reproduced despite a size that is smaller than the resolution limit. Furthermore, the readout durability is more improved than that of the previous silver oxide disk. The pattern is clearly digitized by a read channel circuit for bit-by-bit detection.