A Feasibility Study of 25 GB/Layer Dynamic Recording Using Two-Photon Material and Heat-Mode Bump Formation Method

We developed a novel heat-mode bump formation method using a two-photon material, and its feasibility for high-capacity recording was experimentally demonstrated. This unique recording method exhibits a very high recording resolution and uses a material with excellent optical transparency. These characteristics are very appropriate for realizing high-capacity multilayer optical discs. We also examined the high-density recording feasibility of a Blu-ray-equivalent format and we obtained a jitter value of 22%. We also fabricated quad-layer media and their recording performance was examined. All the layers exhibited almost identical performance characteristics ($2T$ random pattern; jitter, 14.5 to 16.5%) under the same recording and reading conditions.