Numerical Analysis of Detected Signal Characteristics from a Blue Laser Optical Disk Model with Random Rough Surfaces by FDTD Method

Toshitaka KOJIMA   Takanori KAWAI   

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.8   pp.1599-1605
Publication Date: 2007/08/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress of High-Density Information Storage)
blue laser optical disk ,  light-beam scattering ,  FDTD method ,  crosstalk ,  random rough surfaces ,  

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In order to realize a higher density version of the conventional optical disk, shorter wavelength laser and narrower track pitch have been put to practical use. However, using narrow track pitch can cause the increase of the crosstalk from the adjacent tracks. Moreover, the use of narrow pitch and short wavelength can also give rise to the increase of deterioration of the detected signal characteristics due to the microscopic roughness of disk surface. In this paper, in order to estimate the effect of surface roughness theoretically, we try to analyze the light-beam scattering and detected signal characteristics of a blue laser optical disk model with random rough surfaces by the Finite Difference Time Domain (FDTD) method.