Browsing by Author "Tang, NY"

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Effects of aperture wall on the readout signal of erasable thermal phase change super resolution (EPSR) disks
(1999-03-01)
Liu, JR
;
Lu, YS
;
Tien, CH
;
Tang, NY
;
Shieh, HPD
A "below-diffraction-limited" aperture within the readout spot for high-density recording can be achieved on erasable thermal phase change super resolution (EPSR) disks. Compared to the large aperture wall formed by the DC detection method, the small aperture wall formed by pulse readout can not only increase the signal amplitude, but also suppress readout noise when detecting the EPSR disks. The small aperture wall width generated by pulse readout in the EPSR disk resulted in an 8 dB higher in carrier-to-noise (CNR) than that by DC readout in the conventional single-recording-layer phase change disk when reading the below-diffraction-limited marks of 0.4 mu m.
Pulse-read on erasable thermal phase-change superresolution disks
(1998-12-10)
Liu, JR
;
Liu, PY
;
Tang, NY
;
Shieh, HPD
;
光電工程學系
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 mu m, 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. (C) 1998 Optical Society of America.