可擦拭型容積光碟之設計與製作

Abstract

隨著科技的日益進步，人們對資訊的需求更加殷切，不但要求資訊的快速處理，更要求資訊的大量儲存；因此，具備高密度和可攜性等優點的光碟記錄媒體蓬勃發展。因應電腦、通訊、和多媒體等科技的需求，快速的資訊存取、更大的記錄容量、和多樣化的讀寫功能等成為光碟技術發展的指標。其中三元次容積光碟 (three-dimensional volumetric optical disk) 光學儲存技術由於具備巨大的潛力，因而受到廣泛的注意。 提升光碟片的整體容量，除了提高其表面密度之外，可在垂直於碟面的方向上設置多於一層的記錄平面，以倍數提升光碟片的容積密度 (volumetric density)，即三元次容積光碟技術。本論文探討可擦寫式三元次容積光碟中之技術，以進一步提昇光碟片的記錄容量。 三次元容積光碟最簡單的結構為雙層光碟片。為了探討雙記錄層光碟片的讀寫特性，我們設計及製作出具有兩個不同記錄層的光碟片。此光碟片的兩個記錄層1及2的相變化材料厚度各為15及20 nm且分別具有高穿透率及高反射率，製備於兩光碟基板上並黏合起來。由實驗結果得知，僅需1.5 mW的雷射光功率即可提供光碟測試機作聚焦及尋軌，9及16 mW雷射光功率即可提供足夠能量分別記錄在記錄層1及2。因此，採用此雙層光碟的記錄方式，可以在一光碟片中將資料增加兩倍。

In order to fulfill the requirements of computer, communication, and multi-media applications, higher recording density and multiple recording functions are the goals to develop advanced optical storage technology. Among the techniques proposed to improve the performance of optical disks, three-dimensional optical storage technologies attract much attention because of their notable potentials in offering large capacity. It implements more than one data layers along the dimension perpendicular to the recording surface so that the volumetric density of a so-called three-dimensional volumetric optical disks be integrally multiplied. Dual-layer optical disks, the simplest case of volumetric optical disk, comprised of two data layers, were developed to study readout/write/erase characteristics. This disk was composed of recording layer 1 and 2, of high transmittance and high reflectivity, respectively. Layer 1 and 2 of 15 and 20 nm increase transmittance and reduce writing power for recording. The experimental results reveal that only 1.5 mW laser power was sufficient for readout, 9 and 16 mW was required for recording on recording layer 1 and 2, respectively. The data layers thus implemented to form dual-layer optical disk can double data capacity on a disk substrate.