Abstract
New erasable thermal phase-change superresolution (EPSR) disks
composed of mask and recording layers can increase recording density by
the detection of the below-diffraction-limited marks within the readout
spot. The formation of the aperture and the readout signal on the
EPSR disk were analyzed. The feasibility of optically designed EPSR
disks was evaluated by thermal simulation. A carrier-to-noise ratio
of 32 dB at a mark size of 0.4 μm, 8 dB higher than that of a
conventional disk, was obtained by application of a pulse–read method
to the EPSR disks at a wavelength of 780 nm and a numerical aperture of
0.55.
© 1998 Optical Society of America
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