Three-dimensional (FD){sup}2 TD analysis of light-beam diffraction from phase-change optical disks with land/groove recording structures

摘要

The present paper deals with the frequency-dependent finite difference time domain ((FD){sup}2TD) method analysis of the light-beam diffraction from a land/groove recording phase-change (PC) optical disk model with metal (Al or Au) reflective layer in order to improve the conventional analysis for PC optical disk models under the assumption of perfectly conducting reflective layer (PCRL). The diffracted fields are numerically calculated for both recorded and non-recorded states of the recording layer; and the comparison of the diffraction characteristics between two states is discussed. The crosstalk between the recording marks on lands and grooves are evaluated and the optimum groove depth is examined.