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

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4 Author(s)
Baba, K. ; Dept. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Deguchi, T. ; Yamaki, K. ; Miyagi, M.

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

Published in:

Electronics Letters  (Volume:33 ,  Issue: 12 )