Two structures super-resolution near-field phase-change optical disks with masks Sb2 Te3 layer and a
thermal shield layer in front of the mask layer on Blu-ray substrates were studied theoretically and
experimentally. Optical simulation was conducted and the modulation transfer function (MTF) was calculated.
MTF calculation results has revealed that the super-RENS optical disk exhibited the maximum response when
nearly half of the laser spot was covered by the mask. The thermal simulation was used to find the optimum
condition meaning that half of the laser beam is covered by the aperture on the mask layer. The recording signal
and thermal stability on different structures were measured and analyzed. The simulation results are in good
agreement with the experiment results.
The Sb film is proposed as new absorption control layer for high-density phase-change optical disk. The computer simulation results show an absorption control layer in a phase-change optical disk can improve the thermal balance and direct overwriting properties of disk, and Sb film as an absorption control layer is better than Si and Ge films. The experiment results show Sb is a good absorption control layer of high-density phase-change optical disk.