Method and physical mechanism of initialization-free phase-change optical recording

Abstract

A new method of initialization-free phase-change (PC) optical recording was proposed based on the crystallization kinetics of PC media. It was suggested that two special additional layers could be added to the disk to form a new disk structure for the initialization-free function. The physical mechanism of initialization-free PC optical recording was discussed. A model was proposed to explain the initialization-free method which combined the surface crystallization induced by the additional layer and the temperature change during the sputtering process. The simulation results of the initializationfree disk showed only a slight influence of the initialization-free structure on the writing/erasing properties of the PC recording layer. Experimental results verified the feasibility of the initialization-free method for PC optical recording.

Initialization-Free Multispeed Blue Laser Optical Disc

“…To avoid this bottleneck, shorten the production time and reduce the product cost in the production line, an initialization-free method for phase-change optical discs was proposed and the physical mechanism was discussed. 5) ''Initialization-free disc'' means that the as-deposited disc is in the crystalline state because the phase-change recording layer has already been crystallized during sputtering. In our previous work, 6,7) we demonstrated an initialization-free DVD rewritable disc (DVD-RAM) and an initialization-free Blu-ray disc.…”

“…This has been suggested to induce the crystallization of the phase-change recording layer in combination with a temperature change during sputtering. 5) Compared with a conventional Blu-ray disc, an initialization-free Blu-ray disc has two more layers, which significantly changes the optical and thermal properties. The computer simulation and disc design of the initialization-free Blu-ray disc were carried out using our in-house phasechange optical disc design (PCODD) software.…”

Initialization-Free Blue-Laser Optical Disc

“…To shorten production time and reduce product cost in the production line, an initialization-free method of producing a phase-change optical disc and the physical mechanism for this method were proposed. 4) The ''initialization-free'' disc means that the as-deposited disc is in the crystalline state because the phase-change recording layer in this disc has already been crystallized during the sputtering process. Initialization-free DVD-random access memory (DVD-RAM) optical discs and NBLE phase-change discs have already been reported.…”

“…This has been suggested to induce the crystallization of the phase-change recording layer in combination with a temperature change during the sputtering process. 4) The NBLE phase-change disc structure is different from above initialization-free disc structure and it includes a Sb film to partially separate the AVIST phasechange recording layer. 6) Compared with a conventional Blu-ray Disc, an initialization-free Blu-ray Disc has two more layers, which significantly changes the optical and thermal properties.…”