臺灣博碩士論文加值系統

本論文利用雷射引致偶氮染料吸附製作全像光柵，藉由改變激發光強度、時間及偵測光偏振方向，來研究全像光柵形成時的動態研究。在此研究中，在不同的激發光強度及時間照射下，發現一階繞射光強度深受激發光的強度及時間影響。且藉由不同的偵測光偏振方向所觀測到的一階繞射形成期間的不同反應，發現光柵形成時除了受偶氮染料分子吸附造成影響之外，亦有薄膜內液晶分子受激發染料分子產生力矩而有排向改變的情形發生。

Laser-Induced holographic Gratings in dye-doped liquid-crystal films has been investigated by changing the intensity of the two writing beams, the time of the two writing beams and the polarization of probe beam. The cw Ar+ laser has been employed as the writing beams and the cw He-Ne laser has been employed as a real-time probe beam to detect the first order of diffraction singals. In this research, The use differently pump of intensity and under the pump of time. The discovery pump light intensity is prompt is separated the influence diffraction grating formation Different the first order diffraction, which detects the light direction of polarization to observe is different. We propose the explanation,the pump of intensity,pump time and the polarization of probe beam to tests the result the influence.

中文摘要 ------------- i
英文摘要 ------------ ii
誌謝 --------- iii
目錄 ------------ iv
圖表索引 ----------- vii
第一章 論文研究方向與目的 --- 1
第二章 液晶光學簡介 ------ 3
2-1何謂液晶 --------- 3
2-2液晶分類 ----------- 5
2-3液晶物理 ---------- 17
2-3-1 液晶的光學異向性 --------- 17
2-3-2 液晶的連續體彈形變性理論 -------- 21
2-3-3 電場對Nematic 液晶的影響 --------- 22
2-3-4 溫度對Nematic 液晶的影響 -------- 24
2- 4 理論 ----------- 26
2-4-1 正力矩效應：Jánossy Mode ------- 26
2-4-2 負力矩效應：Gibbons Model -------- 29
2-4-3 光激發之同素異構化反應 ------ 31
2.4.4 吸附引致液晶轉向之效應 ------- 33
2-4-5 光致熱效應 ------- 34
2-4-6 光折效應 ---------- 35
2-5 溝槽理論 ----------- 37
2.6 雷射引致之細微波紋 ------ 38
第三章 實驗準備 ------------ 40
3-1 偶氮染料參雜液晶樣品製備---------- 40
3-1-1 材料介紹 ---------- 40
3-1-2 樣品製程 -------- 44
3-2實驗設置架設 --------- 48
3-2-1光柵的製作 -------- 48
3-2-2 光柵的偵測 ------- 46
第四章 實驗結果與討論 ----- 51
4-1 DDLC sample 對線性偏振偵測光偏振方向的關係 ------ 51
4-2 DDLC sample 對線性偏振激發光激發強度的關係 ------ 54
4-3 DDLC sample 對線性偏振激發光激發時間的關係 -------- 58
4-4 分析討論 -------- 62
4-5 改變偵測光偏振觀測sample對激發光激發強度的關係 ------ 66
4-6 改變偵測光偏振觀測sample對激發光激發時間的關係 --- 67
4-7 DDLC sample 對線性偏振激發光時間的關係--68
第五章 總結與展望 ------ 69
參考文獻 -------- 71

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