Multiphysics Simulation of Super-Resolution BD ROM Optical Disk Readout

In this paper we propose a multiphysics simulation of Super-Resolution BD ROM disk readout. Local metallization of the thin semiconductive layer deposited on a ROM substrate comprising a monotone sequence of 100 nm pits has been modelized by applying a Drude nonlinearity to the optical properties of the material. The photo-induced creation of free carriers lifted to the conduction band is assumed to be responsible for a local change in the optical properties of the active layer, making possible the detection of a far-field signal corresponding to pits smaller than the diffraction limit at a high readout power.