紅/藍光僅寫一次型光碟記錄層材料之研究

A study of recording materials for write-once optical disc with red or blue laser

黃國彰(Guo Jang-Huang)

指導教授 ： 劉宗平

元智大學/電機通訊學院/光電工程研究所/碩士(2005年)

摘要

在本文中，我們主要著眼於無機僅寫一次型光碟記錄層材料之研究。在材料的選擇上，我們採用CrOx薄膜以及Zn/Ge雙層薄膜兩種材料。
針對CrOx薄膜而言，我們發現：當薄膜受熱超過400 ℃時，它會釋放出氣體。此氣體會破壞基板，並留下一個訊坑，進而造成薄膜光學特性的改變。因此，我們首先以CrOx薄膜作為紅光DVD-R光碟記錄層的材料，並加以分析。透過一系列的膜層結構之設計優化，由動態測試機所得到的訊雜比，有逐步明顯地改善。
透過DSC儀器分析，我們發現Zn/Ge雙層薄膜結構的相變溫度為385 ℃，相變化後的光學對比度可高達73.57%。之後，我們再將此薄膜作為藍光HD-DVD光碟的記錄層材料，並加以分析。經由一系列的膜層結構設之計與優化，我們發現：碟片記錄前後的光學對比度依然可達56.27%。因此，Zn/Ge薄膜相當具有潛力，作為藍光光碟記錄層材料之用。

關鍵字

無機 ； 僅寫一次型光碟 ； 訊雜比 ； 相變

並列摘要

In this study, we focused our interests on the recording materials for inorganic write-once optical disc. For choosing the recording materials, we adopted CrOx and Zn/Ge bilayer thin film.
For CrOx thin film, we found that the gas could be released from the layer as the heating temperature over 400 ℃. This outgoing gas can destroy the substrate and remain a hole on the substrate so that the optical properties of the film were changed. Therefore, CrOx thin film was firstly used in DVD-R disc as the recording material illuminated by red ray (its wavelength is 650 nm) and then analyzed. Through a series of optimization for the layer structures, the carries noise ratio (CNR) obtained from the dynamic tester had been improved clearly.
By using DSC technique, the phase transition temperature of Zn/Ge bilayer thin film is 385 ℃. The optical contrast of this film was more than 73.57% as the phase transition occurred. Then, we had this material as the recording layer used in HD-DVD disc illuminated by blue ray (its wavelength is 405 nm) and then analyzed. Through a series of optimization for the layer structures, we found that the optical contrast of the disc was still remained over 56.27%. Thus, the Zn/Ge bilayer thin film is a very potential for replacing the conventional recording layer material used in blue-ray disc.

並列關鍵字

inorganic ； write-once optical disc ； carries noise ratio ； phase transition

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