Mark formation model for optical rewritable recording

Mark formation model for optical rewritable recording

Brusche, J.H.

Wesseling, P. (promotor)
Urbach, H.P. (promotor)

Electrical Engineering, Mathematics and Computer Science

2007-02-27

Optically rewritable discs contain one or more so-called recording stacks. These stacks consist of various grooved layers. At least one of these layers contains a so-called phase-change material. In the recording layer, amorphous regions are formed on a crystalline background by means of high power laser pulses. During read-out, differences in reflectivity of the amorphous and crystalline material can be detected and converted into a binary data string. The final shape and size of an amorphous mark are determined by the region that melts due to the absorbed laser light, and recrystallization at the melting front. In this thesis, a numerical model is presented to accurately determine the position of the melting front inside complex composite domains, such as a recording stack. An adaptive local mesh refinement, which is essential for industrially relevant computations, has been included in the model. Finally, results are presented for simulations of the melting component of the mark formation process for DVD and Blu-ray disc configurations.

http://resolver.tudelft.nl/uuid:9bc1729f-6471-4dd6-b61b-8e2a16f3c951

978-90-9021626-3

Institutional Repository

doctoral thesis

(c) 2007 J.H. Brusche