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研究生： 黃三宜
Huang, San-Yi
論文名稱： 聚合物表面引致快速吸附達成液晶光柵光開關
Optically switchable liquid crystal grating based on light-induced fast adsorption of dyes on polymer surface
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： 2006
畢業學年度： 94
語文別： 中文
論文頁數： 89
中文關鍵詞： 液晶 、光柵 、光配向 、光開關 、染料
外文關鍵詞： grating, photo-alignment, dye, liquid crystal, optically switchable
相關次數： 點閱：168  下載：3 
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    • 本論文中主要是研究偶氮染料分子快速吸附在高分子基板表面的特性，也由於具有這方面的優異性，因此便加以來運用使其達成液晶光柵光開關，然而在達成液晶光柵光開關中有兩項缺一不可的主因，剛所提到的快速吸附此為其一，其二由於一般實驗中利用光激發偶氮染料吸附在基板上所引致的負力矩效應為一穩態結構，也就是具有記憶(memory)效果，此乃偶氮染料分子吸附在表面後所造成的永久性溝槽所致，但在本實驗中首度發現，這種染料分子吸附在基板表面上所造成的記憶效果，可藉由外加線性偏振綠光雷射來加以消除，但實際來說並非讓吸附在表面的染料分子脫附而造成消除的效果，而是讓已吸附的染料分子在基板表面作旋轉，最後讓吸附的方向再度改變而達到消除的效果。

    The switching behavior of a TN liquid crystal grating based on the light-induced adsorbed dye molecules on polymer surface was studied. The result shows that liquid crystals are fastly reoriented by the dye molecules adsorbed on polymer surface. In addition, the grating is optically switchable using linearly polarized light. The first-order diffraction intensity, thus, could be controlled by changing the polarization direction of the incident pump light.

    中文摘要......................................Ⅰ 英文摘要............................................Ⅱ 目錄..........................................Ⅲ 圖錄..........................................Ⅵ 表錄..........................................Ⅹ 第一章 緒論............................................1 第二章 液晶的簡介............................2 §2-1 液晶的由來...............................2 §2-2 液晶的種類...............................3 第三章 論文相關理論..........................19 §3-1 液晶分子排列的秩序參數(Order parameter).19 §3-1.1 液晶之非均向性 ( Anisotropy ).......19 §3-1.2 液晶折射率之非勻向性................19 §3-1.3液晶介電係數之非勻向性...............20 §3-1.4 液晶的彈性係數( Elastic constants : k11、k22、k33 )..............................22 §3-1.5二色性染料(Dichroic dye, DD)的類型及其秩序參數(order parameters).....................24 §3-1.6 液晶的彈性係數 ( Elastic constant : k11、k22、k33 ).............27 §3-2 聚合反應的過程......................................................27 §3-3 液晶光柵的簡介......................................................29 §3-3.1 光柵的分類......................................................29 §3-3.2 SRGs 光柵.......................................................32 §3-3.3 吸附效應引致液晶排列............................................33 第四章實驗準備過程.......................................................34 §4-1 樣品材料............................................................34 §4-1.1 材料介紹.......................................................34 §4-1.2 樣品製作.......................................................36 §4.2 配向之檢測..........................................................44 §4-2.1 光學顯微鏡檢測..................................................44 §4-2.2 聚光干涉儀(conoscopy) ..........................................45 §4.3 觀察樣品細微結構之分析儀器..........................................47 §4-3.1 原子力顯微鏡(Atomic Force Microscope, AFM)......................47 §4-3.2 掃描式電子顯微鏡(Scanning Electron Microscope, SEM).............49 §4-4 實驗架設............................................................51 § 4-4.1 實驗樣品吸收光譜之量測.........................................51 § 4-4.2 染料分子快速吸附的相關量測.....................................52 § 4-4.3 液晶光柵光開關的裝置及其相關內容...............................54 §4-5 實驗原理............................................................56 第五章 實驗結果與討論....................................................61 §5-1染料分子吸收光譜的量測...............................................61 § 5-1.1實驗結果與分析..................................................61 § 5-2染料分子快速吸附的相關量測..........................................63 § 5-2.1 Probe beam強度對照射時間的動態量測.............................63 § 5-2.1.1 Probe beam強度對照射時間動態量測的結果分析...................64 § 5-2.2 驗證染料分子在不同材料表面下的吸附結果.........................65 § 5-2.3 SEM下觀察染料分子在不同材料表面下的吸附結構....................66 § 5-2.4 Twist angle(P, A) 對Transmittance(probe beam)的關係............67 § 5-2.4.1 測量結果分析.................................................67 § 5-2.5 在不同pump beam強度下Twist angle(P, A)對Transmittance的關係....69 § 5-2.6 不同扭轉(Twist)角度下的Dimos模擬...............................72 § 5-2.7 染料分子連續與不連續曝光的吸附差異.............................74 § 5-2.8在不同染料濃度下Twist angle(P, A)對Transmittance的關係..........75 § 5-3液晶光柵光開關的相關量測............................................77 § 5-3.1 扭轉已吸附的染料分子...........................................77 § 5-3.1.1 結果分析.....................................................78 § 5-3.2驗證已吸附的染料分子在表面上旋轉................................78 § 5-3.3 光開關probe beam 40次的量測....................................80 § 5-3.4液晶光柵光開關一階繞射的動態量測................................81 第六章 結論與未來展望....................................................83 § 6-1 TN光柵結合網格狀SRG................................................83 § 6-2 模擬各類型液晶光柵結合SRG..........................................84 § 6-3 透光度的改善.......................................................85 參考文獻.................................................................86

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