High-Speed 7× CuSi-Based Write-Once Blu-ray Disc

Abstract

A Cu/Si bilayer can be applied as the recording medium in a write-once Blu-ray Disc (BD-R). Recording experiments performed on BD-R stacks showed that a 1/1 ratio of Cu/Si layers prove to have the best recording results. Auger analysis points to a diffusion-driven process, primarily that of Si into Cu. By optimization of the stack, we have been able to record 1–7× BD-R 25 GB discs with bottom jitters below 6.5% using a castle-type write strategy.