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Proceedings Paper

Mark-forming simulations of phase-change land/groove disks
Author(s): Yoshiko Nishi; Takeshi Shimano; Hidehiko Kando
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Paper Abstract

The track pitches of optical discs have become so narrow that it is comparable to the wavelength of laser beam. Finite-difference time-domain (FDTD) simulation, based on vector diffraction analysis, can predict the propagation of light more accurately than scalar analysis, when the size of media texture becomes sub-micron order. The authors applied FDTD simulation to land-and-groove optical disc models, and found out that the effects of 3D geometry is not negligible in analyzing the energy absorption of light inside the land- and-groove multi-layered media. The electromagnetic field in the media does not have the same intensity distribution as the incident beam. Furthermore, the heat conduction inside the media depends on the disc geometry, so the beam spots centered on land and groove makes different effects in heating the recording layers. That is, the spatial and historical profile of temperature requires 3D analysis for both incident light absorption and heat conduction. The difference in temperature profiles is applied to the phase change simulator to see the writing process of the marks in land and groove. We have integrated three simulators: FDTD analysis, heat conduction and phase change simulation. These simulators enabled to evaluate the differences in mark forming process between land and groove.

Paper Details

Date Published: 18 September 2000
PDF: 6 pages
Proc. SPIE 4090, Optical Data Storage 2000, (18 September 2000); doi: 10.1117/12.399354
Show Author Affiliations
Yoshiko Nishi, Hitachi, Ltd. (Japan)
Takeshi Shimano, Hitachi, Ltd. (Japan)
Hidehiko Kando, Hitachi, Ltd. (Japan)

Published in SPIE Proceedings Vol. 4090:
Optical Data Storage 2000
Douglas G. Stinson; Ryuichi Katayama, Editor(s)

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