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研究生： 王君瑞
Wang, Jyun-Ruei
論文名稱： 摻雜偶氮染料之向列相液晶薄膜在偏振光柵下引致之光折變效應
Photorefractive effect induced by polarization grating in an azo-dye-doped nematic liquid crystal film
指導教授： 傅永貴
Fuh, Ying-Guey Andy
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2003
畢業學年度： 91
語文別： 中文
論文頁數： 83
中文關鍵詞： 光折變效應 、向列相液晶
外文關鍵詞： photorefractive, Nematic liquid crystals
相關次數： 點閱：79  下載：4 
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    • 本論文主要研究摻雜偶氮染料之液晶薄膜在偏振光柵下引致之光折變效應。光折變效應乃是由兩道同調且正交的圓偏振激發光場以及外加直流電場同時存在時所引致。而能夠產生光折變效應的主要機制，起因於偶氮染料具有的光學異向性。在干涉場的存在之下，此一光柵具有電開關的特性。並且在此非尋常的光折現象之下，也觀察到具有雙光耦合的現象。根據目前的文獻所知，本論文所研究利用偏振光柵引致光折變效應在學理上是第一次的發現。

    In this thesis, we studied the orientational photorefractive (PR) effect induced by a polarization grating (PG) in an azo-dye-doped liquid crystal (ADDLC) film. The PR effect was induced by applying a dc field and an interfering field created by two mutually orthogonal circularly polarized beams simultaneously. The cause to form the PR effect was the anisotropy of azo-dye to the polarization of a light beam. The grating was electrically switchable under an interfering field. The two-beam coupling was also observed in such an unusual photorefractive effect. To our knowledge, this study reported PR effect on such polarization holography in the dye-doped NLC system for the first time.

    目錄(contents) 中文摘要 ………………………………………………………………………Ⅰ 英文摘要 ………………………………………………………………………Ⅱ 誌謝 ……………………………………………………………………………Ⅲ 目錄 ……………………………………………………………………………Ⅳ 圖錄 ……………………………………………………………………………Ⅶ 表錄 ……………………………………………………………………………XI 第一章 緒論 …………………………………………………………………1 § 1 – 1 前言………………………………………………………1 § 1 – 2 論文緣起…………………………………………………2 第二章 液晶簡介 ……………………………………………………………3 § 2 – 1 何謂液晶…………………………………………………3 § 2 – 2 液晶分類…………………………………………………4 § 2 – 3液晶物理 …………………………………………………7 2 – 3. 1 液晶的雙折射性………………………………………7 2 – 3. 2 溫度對向列相液晶的影響……………………………9 2 – 3. 3 彈性連續體理論………………………………………11 2 – 3. 4 Fréedericksz遷移……………………………………14 第三章 全像光柵之簡介 ……………………………………………………17 § 3 – 1全像術 ……………………………………………………17 3 – 1. 1 全像光柵的發展………………………………………17 3 – 1. 2 全像術簡………………………………………………17 § 3 – 2波前記錄與重建 …………………………………………20 3 – 2. 1 波前的紀錄……………………………………………20 3 – 2. 2 波前的重建……………………………………………23 § 3 – 3雷射引致全像光柵 ………………………………………24 3 – 3. 1 雙光干涉………………………………………………24 3 – 3. 2 光柵分類………………………………………………29 第四章 光折變效應之理論 …………………………………………………33 § 4 – 1形成光折變效應之因素 …………………………………33 § 4 – 2雙光耦合理論 ……………………………………………36 § 4 – 3向列相液晶之光折變效應 ………………………………43 第五章 實驗準備 ……………………………………………………………46 § 5 – 1實驗樣品製備 ……………………………………………46 5 – 1. 1 材料介紹………………………………………………46 5 – 1. 2 液晶樣品的製作………………………………………46 § 5 – 2實驗原理 …………………………………………………53 § 5 – 3實驗架設 …………………………………………………56 第六章 實驗結果與討論 ……………………………………………………60 § 6 – 1第一階繞射效率的動態量測 ……………………………60 6 – 1. 1 自繞射現象之探討……………………………………60 6 – 1. 2 光柵間距Λ與繞射效率的關係………………………61 6 – 1. 3 激發光強度、電壓與繞射效率的關係………………62 6 – 1. 4 第一階繞射效率的動態觀察…………………………64 6 – 1. 5 光柵開關的響應特性…………………………………66 § 6 – 2雙光耦合與一階繞射的動態量測 ………………………71 § 6 – 3結論.………………………………………………………73 第七章 未來展望 ……………………………………………………………75 § 7 – 1雙光子全像光柵系統 ……………………………………76 § 7 – 2 IPS驅動模式 ……………………………………………77 參考文獻 ………………………………………………………………………80 自述 ……………………………………………………………………………83

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