利用圓偏振光在生化、醫學和藥品分析各種物理特性、手性分子結構，光學活性是常用的方法，近來表面電漿結構等超結構的發展都突顯旋光圓二色光譜儀的重要性。本論文中，我們利用偏振光柵(Polarization Gratings) 把入射光以一定角度被分成兩個向前傳播且為相互正交圓偏振光去建構一台旋光圓二色光譜儀。
利用空氣、玻璃和膽固醇液晶(Cholesteric Liquid Crystal-CLC)，我們成功展示且校正旋光圓二色光譜儀的功能，同時也嘗試利用圓二色性計算公式和 Malus’ s Law偏振圖去分析材料，實驗結果和計算理論乎合預期結果且具一致性。結果也顯示本系統可以透過樣品的旋光方向與對對特定波長的吸收，分析材料光學活性的波長依存性。

Circularly polarized light (CPL) detection is required in various fields such as drug screening, security surveillance and quantum optics. In addition, recent progress in metamaterials further indicate the inevitable future of CPL detection. Typically, CPL photodetector needs broadband quarter waveplates and polarizers, imposing difficulties for integrated and flexible devices. In this thesis, using Polarization Gratings (PGs) as polarizing beam splitter, the incident light can be spited into two forward propagating and mutually orthogonal circularly polarized lights at an angle. This can be therefore used to investigate circular dichroism.

In this thesis, with PGs, we propose a simple and innovative diffractive method for circular dichroism(CD) spectroscopy. Experimentally, using air and glass as samples, the CD spectrometer was calibrated and the result exhibit the functionality of the home made CD spectrometer. Moreover, we also investigate the CD value of CLC. The error of CD is discussed and evaluated as well.

目錄
論文審定書 i
英文論文審定書 ii
致謝 iii
摘要 iv
Abstract v
目錄 vi
圖目錄 viii
表目錄 xii
第一章 緒論 1
1.1 前言 1
1.2 研究目的與動機 2
1.3 論文架構 3
第二章 光譜儀的介紹 4
2.1光譜和光譜儀的發展 4
2.2 常用光譜儀的原理與類型 6
2.2.1 光譜儀種類 7
2.3 旋光圓二色光譜儀機制與應用 9
2.3.1針對圓二色性對旋光度的介紹及發展 13
第三章 旋光圓二色光譜儀研究理論 15
3.1利用偏振光柵建構圓二色性光譜儀系統架設 16
3.2偏振光柵的圓二色性和旋光度 20
3.2.1圓二色性的產生機制 20
3.2.2圓二色光譜 22
3.3 偏振光柵製造技術相關理論 24
3.3.1 偏振光柵光控配向膜折射率響應矩陣表示 26
3.3.2偏振光柵中雙光干涉偏振調變技術 30
第四章 圓二色光譜儀的建設 35
4.1圓二色光譜儀校正 35
4.1.1 不同波長雷射光對PG繞射效率 35
4.2圓二色光譜儀之旋光度校正 37
4.2.1 圓二色儀的零點位置校正 37
4.2.2 不同偏振光對於PG輸出極化影響 41
4.2.3 檢驗偏振光柵的圓極化 44
4.3 總結 46
第五章 旋光圓二色光譜儀的應用 47
5.1 圓二色譜計算理論 47
5.2 圓二色譜量測實驗 49
5.2.1膽固醇液晶的光學特性 52
5.2.2實驗小結 58
5.3 總結 59
第六章 總結與未來展望 60
6.1總結 60
6.2未來展望 60
參考文獻 62

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