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  • 學位論文

Eosin染料與環氧樹脂對全像光資訊儲存材料光電效益之研究

Research of Eosin dye and epoxy resin for optical storage properties of holographic data storage

指導教授 : 陳志恆 楊錦添
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摘要


全像資訊儲存係利用雷射將整頁資訊藉由干涉圖案之方式記錄於具一定厚度之感光光學材料中,其記錄資訊方式是利用記錄媒體之整體體積(3D),而非僅是利用材料表面(2D)作資料記錄,因此其提供具超高容量記錄的選擇。干涉圖案係藉由兩道同調之雷射光束相交干涉於記錄材料中,後續資料圖案重建係藉由單一雷射光束(參考光)入射材料中已形成具週期性折射率差異的光柵結構,將整頁資料成像於電子成像系統 (如CCD camera),並藉由編解碼與訊號處理技術將資料重新取出。 在過去,很多種材料系統已被研究用於全像資料儲存,而光致聚合物高分子(Photopolymer)材料,因其可提供多樣化之記錄機制與材料系統及採用低成本之製造生產,因此是商用全像紀錄媒體材料之最佳選擇,然而此光致聚合物之記錄機制會導致許多缺點,如光致聚合收縮與窄頻寬全像圖等。其中材料之收縮變形將導致數位全像圖案於解碼過程中產生錯誤。近年來已有許多之光致聚合物材料系統被加以研究與發表,而環氧樹脂基材因其聚合方式為開環聚合導致有較低之聚合收縮率,因而被視為一有趣之研究題材,本文將探討添加不同光敏感染料(EB 與 EY dye)對快速聚合環氧高分子應用於藍光全像紀錄之光學記錄特性之影響。 在本研究中,兩種光敏感劑(Photosensitizer) Eosin B與 Eosin Y分別混合於環氧光致聚合物基材中並實際使用於藍光全像紀錄測試。光敏感劑可受光激發使起始劑triethanolamine(TEA)產生自由基,自由基再引發單體acrylamide(AA)聚合,形成全像材料記錄的機制。記錄過後可發現光敏感劑會影響全像材料收縮率,使用Eosin B光敏感劑的收縮率為0.25%,其原因為較高的藍光吸收度會使收縮率較低。另外,全像環氧樹脂硬化劑之折射率與撓曲性亦會影響藍光全像環氧記錄材料之繞射效率。綜合以上,本研究可製備出繞射效率22%及收縮率0.25%的藍光全像記錄材料。

並列摘要


In holographic data storage, an entire page of information is recorded at once as an optical interference pattern within a thick, photosensitive optical material. Holographic data storage is a volumetric data storage technology, which storing information throughout the volume of a medium, not just on its surface, and may offer an ultrahigh-capacity alternative. The interference pattern is formation by intersecting two coherent laser beams within the recording material. Data pattern reconstruction is accomplished by single laser beam (reference beam) incidence into optical grating structure (periodic structure of refraction variation), and full page data pattern is imaged on electronically imaging system (CCD camera). And data may be retrieved by image decoding and signal processing. Many kinds of materials have been investigated as holographic storage media. Photopolymer materials are best candidates for commercial holographic storage media due to their inexpensive to manufacture while offering a wide variety of possible recording mechanisms and materials systems. The recording mechanism for photopolymers also causes some drawbacks, such as the photo-polymerization shrinkage and restricted narrow bandwidth holograms. Shrinkage distortion of the reconstructed holograms may cause errors in decoding the digital data. Several types of photopolymer systems for holographic recording have been reported in recently years. Epoxy-resin matrix are interesting because of their polymerization is based on ring-opening reaction, which generally result in lower shrinkage. In this study, the effect of different photosensitive dyes (EB and EY dye) on the optical recording characteristics of fast curable epoxy polymer media for blue laser holographic recording is reported. Two types of photosensitizers, namely EY and EB dyes, were mixed with epoxy photopolymer matrix and then performed blue laser holographic recording test in our study. Recording with blue laser energy of 405 nm, the Eosin B dye can induce free radical from TEA, which in turn can initiate acrylamide monomer polymerization in holographic material. The photosensitivity of dye can affect the shrinkage of holographic material after recording process. The measured average shrinkage of the Eosin B dye material was 0.25%. The higher the photosensitivity, the lower the shrinkage is. For epoxy holographic material, the refraction index and flexibility of curing agents may have significant effect on the diffraction efficiency. Combing the advantageous factors investigated in this study, an organic blue laser holographic material with diffraction efficiency (22%) and low shrinkage (0.25% ) was prepared.

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