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系統識別號 U0026-0812200913373605
論文名稱(中文) 摻雜染料光配向基板上之複合型配向液晶相位光柵之製作及其光電特性研究
論文名稱(英文) Fabrication and study of binary orthogonal hybrid liquid crystal phase grating based on dye-doped polyvinyl alchohol photoaligned substrate
校院名稱 成功大學
系所名稱(中) 物理學系碩博士班
系所名稱(英) Department of Physics
學年度 95
學期 2
出版年 96
研究生(中文) 郭建宏
研究生(英文) Jian-Hong Guo
電子信箱 secret0509@yahoo.com.tw
學號 l2694409
學位類別 碩士
語文別 中文
論文頁數 91頁
口試委員 指導教授-傅永貴
口試委員-黃啟炎
口試委員-葛聰智
中文關鍵字 液晶  與偏振無關  半波板  相位光柵 
英文關鍵字 liquid crystal  polarization-independent  phase grating  half-wave plate 
學科別分類
中文摘要 本論文利用常用的水平配向膜聚乙烯醇(PVA)摻雜甲基橙染料發展出可重複配向的表面光配向技術,並且利用此技術以兩次曝光並搭配一個條紋光罩的簡單製程製作可以電壓控制繞射效率的兩區互相垂直之複合型配向液晶相位光柵(binary orthogonal hybrid LC phase grating)。此相位光柵的繞射效率與入射偏振無關,第壹階繞射效率最高可達39%,最低可達2%以下,而且第一階繞射點的偏振性相對於入射光具有半波板的效應,可將之利用在可調偏振性及電控效率的分光元件上,雖然實際樣品因邊界過渡區域的液晶排列影響,無法使零階及偶數階如理論預期在液晶長短軸方向相位差ΔΦ=π時完全消失,但是零階及偶數階在此時繞射已相當微弱,配合適當角度的檢偏器情況下可使之幾乎完全消失,所以並不影響其使用價值。
英文摘要 Mixing PVA, a commonly used alignment film to obtain a homogenous liquid crystal (LC) cell, with the methyl orange azo-dye, we develop a re-writable surface photoalignment technique. Based on this technique, we fabricate an electrically controllable binary orthogonal hybrid LC phase grating using two step exposures together with a single-masking process. It is found that the grating is polarization-independent. The maximum and minimum efficiencies of the first order diffraction are 39%, and 2%,respectively. The grating functions a half-wave plate for the first order diffracted beam. It can be applied for uses as polarization- and intensity- controllable beam splitters. Due to the boundary zones resulting from continuous LC alignment, the zeroth- and even orders do not vanish at ΔΦ=π as predicted theoretically, ΔΦ is the phase difference between of the two waves with their polarizations along the direction of LC long axis and short axis. Yet these diffractions are very weak, we can block them off using an adequate analyzer. Thus ,the fabricated grating has potential for practical applications.
論文目次 摘要…………………………..……………………………….………….…Ⅲ
Abstract……………………………………………………………………Ⅳ
誌謝…………………………………………………………………………Ⅴ
目錄…………………………………………………………………………Ⅵ
表目錄………………………………………………………………………Ⅹ
圖目錄…………………………………………………………………….ⅩⅠ

第一章 緒論………………………………………………………….………1

第二章 液晶簡介………………………………………………………….…3
2.1 何謂液晶…………………………………………………….…..........3
2.2 液晶的分類…………………………………………………………...5
2.3 液晶物理特性……………………………………………………….14
2.3.1 雙折射效應(Birefringence)………………………………15
2.3.2 電場效應……………………………………………………….17
2.3.3 連續彈性體特性……………………………………………….19


第三章 相關理論機制…………………………………………...…………21
3.1 配向理論……………………………………………………….……21
3.1.1 溝槽理論………………………………….……………………21
3.1.2 Photoisomerization………………………………...………22
3.1.3 Photodimerization………………………………………….23
3.1.4 Photodecomposition………………………………………...24
3.2 光激發染料引致液晶分子轉向機制……………………………….25
3.2.1 正力矩效應:Janossy model…………………………………26
3.2.2 負力矩效應:Gibbons model…………………………………28
3.3 傅立葉理論………………………………………………………….29
3.3.1 傅立葉轉換…………………………………………………….30
3.3.2 Fraunhofer 繞射的傅立葉轉換………………………….…31
3.4 瓊斯運算(Jones calculus)………………………………….…33

第四章 實驗準備及過程…………………………………………...………38
4.1 樣品準備…………………………………………………………….38
4.1.1 材料特性……………………………………………………….38
4.1.2 基板準備……………………………………………………….41

4.2 樣品製程與實驗光路……………………………………………….42
4.2.1 第一部分流程(TN結構)…………………………………….43
4.2.2 第二部份流程(水平-TN兩次光配向結構)………………….45
4.2.3 第三部分流程(兩區相互垂直的複合型配向相位光柵)…….47
4.3 樣品微觀結構與量測方法………………………………………….49
4.3.1 偏光顯微鏡…………………………………………………….49
4.3.2 TN扭轉角度與光柵繞射點偏振特性量測方法………………50

第五章 實驗結果與分析……………………………...................................51
5.1 染料摻雜PVA薄膜產生TN結構光配向……………………...……51
5.2 染料摻雜PVA薄膜複寫特性……………………………….........…54
5.3 兩區互相垂直之複合型配向液晶相位光柵……………………….56
5.3.1 偏光顯微鏡下結構圖………………………………………….57
5.3.2 繞射特性量測………………………………………………….61
5.3.3 繞射點偏振特性量測………………………………………….67
5.3.4 章結論………………………………………………………….73



5.4 兩區互相垂直之複合性配向液晶相位光柵
繞射理論及修正模型模擬………………………………………….74
5.4.1 理想結構繞射分析…………………………………………….74
5.4.2 修正模型……………………………………………………….79
5.4.3 修正模型繞射物理原理…………………………………….....86

第六章 總結與未來展望……………………………………………...……88
6.1 實驗總結…………………………………………………………….88
6.2 未來展望……………………………………………………….……89
參考文獻…………………………………………………………….………90
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