Recent Developments in Thermal Modelling of High-Speed Dye Recording

概要

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We discuss a generic method to validate a numerical model that can be applied to high-speed dye recording. The method is based on the determination of transition powers that correspond to the onset of pit formation. The mechanism of pit formation is discussed in terms of the decomposition of the recording dye and the softening of the polycarbonate substrate. The decomposition temperature of compact disc (CD) and digital versatile disc (DVD) dyes was measured with two different methods, involving heating rates that approach those encountered during recording. The softening temperature of polycarbonate was also measured. The laser powers required for the onset of dye decomposition and softening of the polycarbonate-dye interface were determined from continuous-writing (DC-write) reflection measurements for 1X-40X CD-R recording and 1X-10X DVD+R recording. In addition, transition powers were obtained from atomic force microscopy (AFM) analyses of written tracks. The DC-reflection and AFM-topography measurements appear to collapse onto one generic master curve for the entire range of tested recording velocities for each type of CD and DVD. From the measured temperatures for the onset of dye decomposition and polycarbonate softening, transition powers were also calculated with a numerical model of the multilayer recording stack. Numerical results are compared with experimental values for a CD and DVD type of disc.
2003-02-15