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- W1500333536 abstract "The primary objective of this dissertation is to present a clear physical picture and useful insights of polarization effects in the diffraction of focused beams by grooved, multilayer-coated disks. The reading process of optical disk systems significantiy relies on the reaction of the incident focused beam to the disk structure, may it be the groove profile or coating materials. The residting complex-amplitude from diffraction is the main source for the readout signal. For instance, the distinct reflectance between crystalline and amorphous states carries the data information for phase-change disks; the Kerr rotation of the magneto-optical medium is generated frwm the optical activity of the magnetic layer with the incident beam; the cross-talk or cross-erase cancellation in the land-groove recording scheme closely depends on the groove depth of the disk. In the presence of the periodic pattern and the focused beam, however, different polarization states usually result in different complex-amplitudes. A good understanding of polarization effects in grooved multilayer disks is thus required for the optimum design of optical data storage systems. The pursuit of high-density recording inevitably drives the optical data storage industry to reduce the wavelength of light sources, decrease the track pitch of optical disks, and increase the numerical aperture of objective lenses. The track pitch and the size of the focused spot gradually approach the optical wavelength. Under these circimistances, the analysis of the interaction of focused beams with this type of highfrequency periodic disk using conventional scalar diffraction theory is no longer" @default.
- W1500333536 created "2016-06-24" @default.
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- W1500333536 date "1999-01-01" @default.
- W1500333536 modified "2023-09-27" @default.
- W1500333536 title "Interaction of the focused laser beam with the grooved surface of optical disk: Evanescent coupling and vector diffraction effects" @default.
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