標題: 光彈調變式偏光儀對 DR19/PMMA中光致線性雙折射現象之研究
The Study of the Photo-induced Birefringence of DR19/PMMA by the Photo-elastic Modulation Ellipsometry
作者: 鄭兆峻
Chao-Chun Cheng
趙于飛
Yu-Faye Chao
光電工程學系
關鍵字: 光致雙折射效應;光彈調變式橢圓偏光儀;偶氮苯化合物;分散紅19;角度燒孔效應;Photo-induced Birefringence;Photo-elastic Modulation Ellipsometry;Azobeneze;Disperse Red 19;Angular Hole Burning Effect
公開日期: 2007
摘要: 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.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009424538
http://hdl.handle.net/11536/81357
顯示於類別:畢業論文


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