New write-once medium with NiOx film using blue laser

Hung Lu Chang*, Tzuzn Ren Jeng, Jung Po Chen, Wen Hsin Yen, Pofu Yen, Der-Ray Huang, Jau Jiu Ju

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Both a new write-once medium with a sputtered NiOx film and a write-once optical disk using a blue laser has been fabricated. The optical constant of sputtered NiOx films for different ratios of O 2/Ar was determined, and showed little dependence on sputtering ratios of O2/Ar and wavelength. The X-ray photoelectron spectra (XPS) data indicated those films have two major components, NiO and Ni 2O3. Most NiOx films released oxygen gradually below 300°C. Over 300°C, there was an apparent transition due to the decomposition of the Ni2O3. At a writing power of 12mW and a reading power of 0.5mW under conditions of a numerical aperature (NA) of 0.65 and a wavelength of 405 nm, the carrier to noise ratio (CNR) was more than 47 dB and jitter was less than 13%. The recording principle depends primarily on the explosive pressure of the O2 released due to laser heating of the NiOx film.

Original languageEnglish
Pages (from-to)6109-6112
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number8
StatePublished - 5 Aug 2005


  • Blue laser
  • Carrier-to-noise ratio
  • NiO film
  • Write-once optical disk
  • Writing and reading power

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