Compact-disc compatible wideband write-once optical disc memories using multilayered ultra-thin silver films

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Compact-disc compatible wideband write-once optical disc memories using multilayered ultra-thin silver films

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A write-once (WO) optical disc memory with compact disc (CD)-compatibility is demonstrated by using a multilayer consisting of a silver reflective layer, thin glass spacing layer, and silver quasi-island recording layer. The reflectance of the multilayer is > 70% at a wavelength of 800 nm. The reflectance can be greatly lowered by laser irradiation, since the silver quasi-island layer changes by heating, becoming absorptive and of low reflectivity due to structural change. As a large reflectance change has been observed not only at 800 nm for CD but also at 650 nm for a digital video disc (DVD), a CD-DVD compatible wideband write-once optical disc is realised.

Inspec keywords: reflectivity; discontinuous metallic thin films; optical disc storage; silver; video discs

Other keywords: DVD compatibility; Ag reflective layer; Ag; multilayer structure; wideband write-once memories; laser irradiation; multilayered ultra-thin Ag films; Ag quasi-island recording layer; 650 nm; digital video disc compatibility; optical disc memories; compact disc compatibility; 800 nm; thin glass spacing layer; CD compatibility

Subjects: Optical storage and retrieval; Optical storage

References

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      • K. Hayashi , K. Baba , M. Miyagi . Durable write-once optical disk memories for 800 nm using silver islandfilms. Electron. Lett. , 1495 - 1496
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      • E. Hamada , Y. Shin , I. Ishiguro . CD-compatible write-once disc with high reflectivity. Proc. Soc. Photo-Opt. Instrum. Eng. , 80 - 88
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