臺灣博碩士論文加值系統

DR19是一種具極性的類液晶單軸分子，此類化合物之光致雙折射反應是各方研究之重點。本論文利用光彈調變式橢圓偏光儀量測DR19/PMMA受光激發下之線性雙折射的動態變化。分析光強度中之倍頻訊號，可以量得樣品之線性雙折射值。
我們分別改變垂直激發光源之入射角度和偏振態，並在各入射角下量其雙折射值:若將激發光源之偏振態設為 TM, 此塊材之線性雙折射值與入射角呈現負相關之關係，相位差最大值為24.3度；若將激發光源之偏振態設為 TE ，則此塊材之線性雙折射值與入射角呈現正相關之關係，相位差最大值為33.1度。 我們也量測DR19/PMMA之折射率，發現此塊材在照光過程中折射率保持在1.495+-0.001。

DR19 is a kind of rod-like uniaxial molecule with non-zero electric dipole moment and its photo-induced birefringence effect has been extensively studied. The PEM Ellipsometer is used to monitor the dynamic change of DR19/PMMA under exposure. The linear birefringence (LB) can be measured simultaneously.
The birefringence of sample was probed by various incident angles under a normally inducing beam with the p- and s-polarized, respectively. In the study, we found the induced LB decreases under p-polarized light but increases under s-polarized with respect to the incident angle of probe beam. The refractive index under exposure was also measured by the ellipsometry near its Brewster angle, which remain to be 1.495+-0.001 in the whole process.

第一章 序論………………………………………………………………………1
第二章 基本原理
2.1光波的電場理論與橢圓偏極態理論……………………………………………4
2.2 史托克參數 (Stokes Parameter) 與穆勒矩陣 (Mueller Matrix)………7
2.3 橢圓特性參數 Ψ 和 Δ 之定義……………………………………………1
2.4 反射光之史托克參數 (Stokes Parameter) 與穆勒矩陣
(Mueller Matrix)……………………………………………………………13
2.5光彈調變器(Photo-Elastic Modulator，簡稱PEM)…………………………16
2.5.1 光彈調變器的機制表示法………………………………………………… 17
2.6 偶氮苯化合物（Azobeneze）之簡介…………………………………19
2.6.1光致異構化反應……………………………………………………………19
2.6.2 角度燒孔效應……………………………………………………………21
2.6.3 光致雙折射效應……………………………………………………………22
2.7 光致線性雙折射量值之量測…………………………………………………23
2.8 激發光源強度修正……………………………………………………………26
第三章 實驗步驟
3.1實驗器材及規格…………………………………………………………27
3.2實驗架構………………………………………………………………27
3.2.1 穿透率之量測………………………………………………………………27
3.2.2 LB量值之量測………………………………………………………………28
3.3樣品角度之校正………………………………………………………………25
3.4激發光源之穩定度……………………………………………………25
第四章 實驗結果
4.1實驗樣品…………………………………………………………………31
4.2 折射率之量測……………………………………………………………31
4.3 穿透率之量測……………………………………………………………33
4.4 倍頻訊號之處理…………………………………………………………34
4.5 垂直激發時，DR19/PMMA 雙折射效應之改變………………………………39
4.6 斜向激發時DR19/PMMA雙折射效應之改變…………………………………41
4.7 以圓偏光激發時DR19/PMMA雙折射效應之改變………………………42
第五章 結論……………………………………………………………………43
未來展望 ……………………………………………………………………………45
參考文獻……………………………………………………………………………46
附錄A………………………………………………………………………………49

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