Center aperture detection on magnetically induced super resolution magneto-optical disks

Liu, Pei-Yih; Shieh, Han–Ping D.

doi:10.1016/0304-8853(95)00708-3

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1998

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“…8,9 In this paper a new structure for an erasable phase-change disk that uses the superresolution detection method is proposed. Analyses of the readout signal of erasable phase-change superresolution ͑EPSR͒ disks were made by optical simulation 10,11 ; the possibility of effective detection on EPSR disks was evaluated by thermal analysis. According to the simulation results, the EPSR disk structure was designed to yield adequate signal readout by use of an appropriate readout aperture.…”

Section: Introductionmentioning

confidence: 99%

Pulse–read on erasable thermal phase-change superresolution disks

Liu

Tang

et al. 1998

Appl. Opt.

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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 mum, 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.

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