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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 23 — Aug. 10, 2000
  • pp: 4153–4159

Readout Signals Calculated for Near-Field Optical Pickups with Land and Groove Recording

Kimihiro Saito, Koichiro Kishima, and Isao Ichimura  »View Author Affiliations


Applied Optics, Vol. 39, Issue 23, pp. 4153-4159 (2000)
http://dx.doi.org/10.1364/AO.39.004153


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Abstract

Optical disk readout signals with a solid immersion lens (SIL) and the land–groove recording technique are calculated by use of a simplified vector-diffraction theory. In this method the full vector-diffraction theory is applied to calculate the diffracted light from the initial state of the disk, and the light scattered from the recorded marks is regarded as a perturbation. Using this method, we confirmed that the land–groove recording technique is effective as a means of cross-talk reduction even when the numerical aperture is more than 1. However, the top surface of the disk under the SIL must be flat, or the readout signal from marks recorded on a groove decays when the optical depth of the groove is greater than λ/8.

© 2000 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1960) Diffraction and gratings : Diffraction theory
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(210.0210) Optical data storage : Optical data storage
(210.4590) Optical data storage : Optical disks

Citation
Kimihiro Saito, Koichiro Kishima, and Isao Ichimura, "Readout Signals Calculated for Near-Field Optical Pickups with Land and Groove Recording," Appl. Opt. 39, 4153-4159 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-23-4153


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