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研究生： 馬佳銘
Ma, Jia-Ming
論文名稱： 可光控與可電控空間濾波器於鍍有光導電膜之液晶摻雜聚 合物薄膜之研究
Optically and electrically controllable spatial filter in a polymer-stabilized liquid crystal film with a photoconductive layer
指導教授： 李佳榮
Lee, Chia-Rong
學位類別： 碩士
Master
系所名稱： 理學院 - 光電科學與工程研究所
Institute of Electro-Optical Science and Engineering
論文出版年： 2009
畢業學年度： 97
語文別： 中文
論文頁數： 100
中文關鍵詞： 液晶 、聚合物 、空間濾波器
外文關鍵詞： spatial filter, polymer, liquid crystal
相關次數： 點閱：58  下載：1 
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    • 本論文研究題目為『可光控與可電控空間濾波器於鍍有光導電膜之液晶摻雜聚合物薄膜之研究』。本論文主要利用外加直流電場下造成光導電層與液晶介面相反電性電荷的累積以形成一個與外加直流電場反向的內建電場，造成屏蔽效應。當樣品受到綠光照射時，光導體膜之導電率會有所提升，使得內部界面累積電荷會產生放電，導致屏蔽效應減弱，Freedericksz transition臨界電場也會降低。當液晶受到電控或是光控導致轉向時，樣品會因為聚合物枝條結構導致液晶形成多域結構(multi-domain)而導致穿透度下降。

    PSLC樣品可藉由調控不同的直流電壓或是入射光強度，達到經過物產生的不同繞射階圖樣可被選擇性過濾。利用傅利葉分析模擬和實驗結果也相當吻合。此外，我們亦可應用此結果在邊緣加強的效果。

    This thesis is entitled “Optically- and electrically controllable spatial filter in a polymer-stabilized liquid crystal (PSLC) film with a photoconductive (PC) layer”.
    With the application of a dc voltage,charges with opposite electricity can accumulate on the interfaces between the cell substrates and the LCs to generate a screened field
    which may partially offset the applied field. Once the cell is irradiated with a pump beam, the conductivity of the PC can enlarge such that the internal surface charges
    can discharge to reduce the screen effect and thus the threshold voltage for Freedericksz transition can decrease. When the LCs is electrically or optically controlled to reorient,the transmission of the cell decreases because of the confinement of the polymer network induced LC to multi-domain

    By varying the applied dc voltage or incident pumped intensity, different spatial distributions of the different pattern of the target object can be selected for filtering by the single PSLC cell, such that various reconstructed images can be obtained. A simulation using Fourier analysis is developed, and its result are in agreement with experimental result. Additionally, the PSLC spatial filter can be used on the application of controllable edge enhancement.

    摘要…………………………………………………………I Abstact……………………………………………………II 誌謝………………………………………………………III 目錄 ………………………………………………………IV 圖目錄 ……………………………………………………VI 表目錄 …………………………………………………VIII 第一章 緒論.....................................1 1.1 前言......................................1 1.2 研究動機..................................2 第二章 液晶簡介................................5 2.1 何謂液晶...................................5 2.2 液晶的分類.................................7 2.3 液晶物理特性..............................16 2.3.1 雙折射性............................16 2.3.2 電場效應............................18 2.3.3 連續彈性體特性......................20 2.3.4 Fréedericksz transition.............21 第三章 相關理論機制............................23 3.1 PSLC薄膜簡介及工作原理 ...................23 3.1.1 平行配向之PSLC ..................23 3.1.2 垂直配向之PSLC.....................26 3.2 傅立葉理論.............................28 3.2.1 傅立葉轉換..........................28 3.2.2 傅立葉分析..........................29 3.2.3 繞射理論中的傅立葉轉換..............34 3.2.4 空間頻率............................35 3.2.5 阿貝成像原理........................37 3.2.6 空間濾波術..........................39 3.3 光導體與光敏感劑作用理論...............42 3.3.1 光導電性............................42 3.3.2 聚乙烯咔唑(polyvinylcarbazole(PVK)) 的物理特性..........................43 3.3.3 摻雜碳六十之聚乙烯咔唑光導體........45 3.3.4 聚乙烯咔唑與碳六十的相互作用機制....47 3.3.5 光導體層之光引致導電過程............53 第四章 實驗準備及過程..........................56 4.1 材料介紹.................................56 4.1.1 向列型液晶MLC6882...................56 4.1.2 聚合物RM257.........................56 4.1.3 光敏劑C60...........................57 4.1.4 有機光導體聚九乙烯咔唑..............58 4.1.5 DMOAP...............................58 4.2 製作流程.................................59 4.3 實驗光路架設.............................62 第五章 實驗結果與討論..........................64 5.1 鍍有光導電層之PSLC在不同濃度的 聚合物以及不同比例的光敏感劑與 光導體下之研究...........................65 5.1.1具有不同濃度聚合物之PSLC散 射程度的研究.........................65 5.1.2PSLC空間濾波器之可電控濾波 特性之研究在不同濃度聚合物 及不同濃度比例光敏感劑與光 導體時...............................67 5.1.3PSLC空間濾波器之可光控濾 波特性之研究在不同濃度聚 合物及不同濃度比例光敏感 劑與光導體時.........................74 5.2 最佳條件下的PSLC空間濾波器之 可電調控濾波特性.........................87 5.3 最佳條件下的PSLC空間濾波器之 可光調濾波控特性.........................89 5.4 PSLC空間濾波器之應用.....................91 5.4.1二維光柵之濾波應用...................91 5.4.2 幾何圖形邊緣加強之應用..............93 第六章 總結與未來展望..........................95 6.1實驗總結..................................95 6.2未來展望..................................96 參考文獻 …………………………………………………97

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