IRGACURE 784摻雜聚甲基丙烯酸甲酯體積全像高分子紀錄材料之研製與測試

Fabrication and characterization of IRGACURE 784 doped Poly(methyl methacrylate) photopolymer for holographic memory

許瀚升(Han-Sheng Xu)

指導教授 ： 林烜輝 ； 薇娜

國立交通大學/理學院/電子物理系所/碩士(2018年)

摘要

在本論文中，我們致力於改進 PQ/PMMA體積全像高分子記錄材料。實驗發現由於PQ分子的吸收峰已遠離532 nm，因此在此波長下，它的全像紀錄特性不佳，所以我們尋找一種在此波長下有較高吸收率，並且可以有類似PQ光裂解反應的光染料，來取代PQ摻雜在原基底PMMA中，IRGACURE 784為其中可能性之一。首先，找到適當的製程條件，製作IRGACURE 784/PMMA樣品。我們對新的樣品進行全像特性量測並且和PQ/PMMA比較，結果顯示可以讓材料的敏感度大幅提升提升7倍以上。
其次，我們進行IRGACURE 784/PMMA樣品的改良研究。首先，採用添加共起始劑DI的方式，來改善我們材料的敏感度，經測量材料的敏感度提升了26倍，在DVD碟片之格式下，儲存容量可達50GB，以及存取速度約為7Mbs/s；其次，我們改變單體，採用共基底的方式將具有更多反應基團的TMPTA單體加入到我們材料中，因為TMPTA單體擁有三個乙炔基，我們預期它可以增加反應的環境活性，加速反應的進行，實驗證實，相較於PQ/PMMA，IRGACURE 784/Poly-(TMPTA-co-MMA)樣品的動態範圍改進了3.7倍，而敏感度則提升了112倍，在同樣的光學系統下可以估計出儲存容量為138GB，存取速度為35 Mbs/sec，這證實了我們改進策略是有效的。

關鍵字

感光高分子 ； 體積全像 ； 全像 ； IRGACURE 784

並列摘要

In this thesis, we report studies to improve the holographic characteristics of PQ/PMMA materials at wavelength is 532 nm produced by our laboratory. It because that experiments have shown the advancements in diode-pumped solid-state (DPSS) lasers at wavelength is 532 nm to facilitate the development of compact optical systems, including holographic data storage. Our PQ/PMMA photopolymer is not sensitive to wavelength of 532 nm because transmission shoulder of PQ is around 534 nm. Thus, to improve its holographic characteristics, one of possibilities is to find a new dye element that is photosensitive at this wavelength and at the same time suitable for resuming the same holographic recording mechanism with PQ. Here, we choose Irgacure 784 molecule from Irgacure family, a class of titanocene photosensitizer, since they are usually used for initiating the photopolymerization of acrylate monomer materials with green light. First, material fabrication technique of Irgacure 784 doped PMMA photopolymer has been developed and the material characteristics have been tested to show 7-fold increasing on material sensitivity, compared with PQ/PMMA.
We then try to further improve the holographic characteristics of IRGACURE 784/PMMA. First, we added the co-initiator DI to improve the sensitivity of materials. The results show the 26-fold increasing on material sensitivity, compared with PQ/PMMA. With our testbed, under the same size of DVD disk, the storage capacity of new material can reach to 50 GB and the data rate is 7 Mbs/s. Second, we test to change the monomer for increasing the storage capacity and material sensitivity. We add TMPTA monomer to form copolymer system, because TMPTA monomer has three vinyl groups such that it can be expected to increase the environmental activity of the reaction and accelerate the reaction. The dynamic range and sensitivity of our IRGACURE 784/Poly-(TMPTA-co-MMA) sample reached M/#=6.219, S=1.116, respectively. Under the same system conditions, the storage capacity was estimated to be 138 GB and the data rate to be 35 Mbits/sec, which is 3.7-fold increasing on capacity and 112-fold increasing on material sensitivity.

並列關鍵字

IRGACURE 784 ； Holography ； Photopolymer ； Volume Holography

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