本論文利用光電薄膜結合液晶材料製作菲涅爾透鏡。使用光電薄膜應用在液晶盒讓液晶盒產生可光引致導電性的光電特性，在施加電壓的時候液晶分子會依照實驗設定的光照射區域被電場拉動，使用莎格涅克干涉光製作出近似Fresnel Zone Plate的圖樣，照在光電薄膜上即可完成菲涅爾透鏡。此透鏡焦距可隨Fresnel Zone圖樣大小調變，並具有可光控與可電控繞射聚焦效率的光電特性，而光控與電控的聚焦效應都可以得到非常高的繞射效率。

In this study, we propose a liquid-crystal Fresnel lens based on optoelectronic film. The optoelectronic film lead to photo-induced conductivity of liquid crystal cell. When a voltage applies in the cell, the liquid crystal molecules will be driven in that photo-illuminated area. We fabricate a Fresnel lens by using a Sagnac interference pattern of liked Fresnel zone to irradiate on the liquid crystal cell with an optoelectronic film. The focal length of liquid crystal Fresnel lens can be tunable via varying sizes of Sagnac interference pattern. The diffraction efficiency of liquid crystal Fresnel lens can be tuned by applying electric flied and photon, respectively. The liquid crystal Fresnel lens has a high diffraction efficiency at the focal point.

致謝 i
摘要 ii
Abstract iii
目錄 iv
圖次 vii
表次 ix
第一章　液晶簡介 1
1-1 前言 1
1-2 液晶簡介 2
1-3 液晶分類 2
1-4 液晶物理 4
1-4.1 秩序參數 (order parameter, S) 4
1-4.2 液晶的彈性連續體理論 5
1-5.3 液晶的介電異向性(dielectric anisotropic, Δε) 6
1-5.4 液晶折射率異向性(Birefrigence, Δn) 6
第二章　實驗相關理論 10
2-1 光導體與感光劑 10
2-1.1 光導電性 10
2-1.2 聚乙烯咔唑(polyvinylcarbazole, PVK)的物理特性 10
2-1.3 摻雜碳六十之聚乙烯咔唑 11
2-1.4 聚乙烯咔唑與碳六十之間的作用 11
2-1.5 光導體引致導電 12
2-2 Fresnel理論 13
2-2.1 Theory of Fresnel lens 13
2-2.2 Theory of binary phase Fresnel lens 15
2-3 莎格涅克干涉 (Sagnac interference) 19
第三章 樣品製作及測量 21
3-1 材料介紹 21
3-1.1 液晶材料 21
3-1.2 聚乙烯咔唑 21
3-1.3 感光劑碳六十 22
3-2 樣品製作流程 22
3-2.1 清洗Indium-Tin-Oxide (ITO)玻璃 22
3-2.2 配製聚乙烯咔唑摻雜碳六十 22
3-2.3 基板薄膜製做 23
3-2.4 液晶盒組裝 23
3-3 實驗光路架設 24
3-3.1 基本光路 24
3-3.2 Fresnel lens 焦距量測架設 24
3-3.3 Fresnel lens 聚焦效率量測 25
3-3.4 Fresnel lens 光學顯微圖拍攝 26
第四章 實驗結果與討論 27
4-1 氬離子雷射透過莎格涅克干涉形成同心環 27
4-2 Fresnel lens 聚焦影像 28
4-3 Fresnel lens 樣品之光學顯微圖 29
4-4 Fresnel lens 電控聚焦效率 30
4-5 Fresnel lens 光控聚焦效率量測 32
4-6 Fresnel lens 焦距調控 33
4-7 樣品的偏振依賴性量測 34
第五章 總結 36
參考資料 37

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