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論文名稱 Title |
膽固醇液晶光柵之製作及光電特性研究 Studies and Fabrications of Cholesteric Liquid Crystal Gratings |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
57 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2014-09-24 |
繳交日期 Date of Submission |
2014-09-25 |
關鍵字 Keywords |
繞射效率、電壓、溫度、光柵、膽固醇液晶 grating, thermal effect, diffraction efficiency, cholesteric, stripe |
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統計 Statistics |
本論文已被瀏覽 5708 次,被下載 200 次 The thesis/dissertation has been browsed 5708 times, has been downloaded 200 times. |
中文摘要 |
本論文製作條紋方向可調控之膽固醇液晶手紋繞射光柵,其在無外加電壓下即可獲得,且可利用外加溫度或電壓可調控條紋方向的轉動。在外加溫度上升時,條紋逆時針方向旋轉,此為溫度升高造成膽固醇液晶螺距縮短所致。當電壓上升時,條紋朝順時針方向旋轉,此為電壓上升造成膽固醇液晶螺距拉長的結果。再者,本論文製作出一階和二階最大繞射效率可切換的膽固醇液晶光柵,此光柵疊加了膽固醇液晶手紋光柵和電極相位光柵兩種不同模態,成為新型的高效率液晶繞射光柵。低電壓驅動時,膽固醇液晶水平態與手紋結構的疊加使其具有最高之二階繞射效率32%。在高電壓驅動時,膽固醇液晶水平態與垂直態交替出現之光柵具有一階最高繞射效率32%。研究更發現,膽固醇螺距和電極寬度均為20μm時可得到最高的繞射效率32%,此與理論值33.8%相當接近。 |
Abstract |
This thesis demonstrates two tunable gratings based on cholesteric liquid crystals (CLCs). The first one is the thermally rotatable grating with hybrid-aligned (HBA) structures. Experiments reveal that the HBA-cholesteric texture has a uniformly striped domain, which forms a grating, when the ratio of the cell gap to the helical pitch (d/p) is in the range of 2~ 3. The stripe direction of the HBA-cholesteric grating rotates continuously under thermal and electrical effects. Furthermore, the HBA-cholesteric grating has a larger rotational angle under the thermal effect (~101゜) than under the electrical effect (~48゜). The second grating is an electrically switchable diffraction grating (ESDG) fabricated by filling the CLCs into the cell with slit electrodes. On one hand, with low voltage, the ESDG has high second order diffraction efficiency because of the alternating planar and fingerprint textures. With high voltage, on the other hand, the ESDG has high first order diffraction efficiency because of the alternating planar and homeotropic textures. The first and second order diffraction efficiencies of ESDG are electrically swapped. The maximum diffraction efficiency of the ESDG is approximately 32% at each grating mode. |
目次 Table of Contents |
論文審定書 ⅰ 致謝 ⅱ 中文摘要 ⅲ Abstract ⅳ 目錄 ⅴ 圖表目錄 ⅶ 第一章 簡介 1 §1.1 前言 1 §1.2 液晶的介紹 2 §1.3 液晶的分類 3 第二章理論介紹 9 §2.1 液晶的雙折射性 9 §2.2 液晶的介電異向性 10 §2.3 液晶的彈性係數 12 §2.4 光柵繞射系統 12 第三章樣品製作及實驗裝置 21 §3.1 材料介紹 21 §3.2 繞射條紋可旋轉之膽固醇液晶光柵樣品製作 23 §3.3 最大繞射效率階數可切換之膽固醇液晶光柵樣品製作 24 §3.4 實驗裝置與步驟 25 第四章 繞射條紋可旋轉之膽固醇液晶光柵 27 §4.1 實驗內容 27 §4.2 實驗結果與討論 28 第五章最大繞射效率階數可切換之膽固醇液晶光柵 34 §5.1 實驗內容 34 §5.2 實驗結果與討論 34 第六章結論與未來研究 39 參考文獻 40 |
參考文獻 References |
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