以膽固醇液晶結構變化調制線偏振光特性

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姓名

王郁澤(Yu-Tse Wang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

以膽固醇液晶結構變化調制線偏振光特性
(Modulation of properties of linearly polarized light using structural variations of chiral nematics)

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至系統瀏覽論文 (2027-12-1以後開放)

摘要(中)

本論文研究主題為提出兩種可調式連續線性偏振旋轉器，全文共分為三部分，第一部分針對楔形液晶盒及膽固醇液晶進行研究，利用光斑大小驗證楔形液晶盒厚度的準確性，再利用膽固醇液晶反射頻譜及卡諾楔形盒理論探討手性分子(CB15)對向列型液晶(HEF951800-100)之螺旋扭轉力(HTP)值，最後討論膽固醇液晶特定螺距下在(1)相同液晶分子總旋轉角及不同螺距下及(2)不同液晶分子總旋轉角及相同螺距下對出射光偏振度之影響。第二及第三部分將分別提出利用楔形液晶盒製作可調式連續偏振旋轉器及利用圓形配向製作可調式連續偏振旋轉器。第二部分將透過楔形液晶盒讓液晶在空間上形成非完整週期結構，再將楔形液晶盒吸附環型磁鐵以使其受磁場作用改變液晶盒厚度，進而在厚度變化下改變偏振旋轉。第三部分為利用圓形配向及水平配向使圓形配向面形成圓對稱結構之排列，再將此液晶盒吸附磁鐵以使其受磁場作用改變液晶盒厚度，在厚度變化下改變每個結構之螺距長度及螺距數量進而改變出射光的偏振旋轉。

摘要(英)

The research topic, divided into three sections, of this thesis is to propose two kinds of tunable continuous linear polarization rotators. In the first section, we study the wedge-shaped liquid crystal (LC) cell filled with cholesteric LCs (CLCs). The thicknesses of the wedge-shaped LC cell, measured by different light spot sizes, are examined, and the helical twisting power value of CB15 with respect to HEF951800-100 is discussed by using the transmittance spectrum of the CLCs and the Cano wedge cell theorem. Finally, the influences of degree of linear polarization values of the output light through the CLCs with (1) the same total twisted angle but different pitches, and (2) the same pitch length but different total twisted angles are discussed. The second and third parts of this thesis propose a tunable continuous polarization rotator using a wedge-shaped LC cell and the alignment layer treated by circular rubbing treatment, respectively. The second part will make the CLC form a non-integer periodic structure in space by the wedge-shaped LC cell, and then examine the polarization rotation angle after the cell gap is tuned by magnetic force (magnets). The third part is to use circular alignment and horizontal alignment layers to form a specific LC alignment. The polarization rotation angles of the output light can be changed by the variations of pitch length and pitch numbers according to the variations of the thickness of the LC cell by ring magnets.

關鍵字(中)

★ 膽固醇液晶
★ 楔形液晶盒
★ 線性偏振旋轉器

關鍵字(英)

★ cholesteric LCs
★ wedge-shaped LC cell
★ linear polarization rotators

論文目次

摘要 i
Abstract iii
目錄 iii
圖目錄 v
表目錄 viii
第一章緒論 1
§ 1-1 前言 1
§ 1-2 研究動機 1
§ 1-3 文獻回顧 1
§ 1-3-1混成配向楔形膽固醇液晶盒[5] 1
§ 1-3-2 改變膽固醇液晶螺距數目對線偏振旋轉之影響[3] 2
§ 1-3-3 空間變化的偏振場[6] 3
§ 1-4 論文架構 4
第二章液晶簡介 5
§ 2-1 何謂液晶 5
§ 2-2 液晶歷史 6
§ 2-2-1 圓盤狀液晶 7
§ 2-2-2 長條狀液晶 7
§ 2-3 液晶的光電特性 13
§ 2-3-1 光學異向性(Optical anisotropy)[24] 13
§ 2-3-2 介電異向性(Dielectric anisotropy)[24] 18
§ 2-3-3 連續彈性體理論(Elastic Continuum Theory)[25] 20
第三章實驗相關理論 22
§ 3-1 膽固醇液晶理論 22
§ 3-1-1膽固醇液晶結構排列 22
§ 3-1-2影響膽固醇液晶螺距的外在因素 23
§ 3-2 線偏振度(Degree of linear polarization, DoLP) 25
§ 3-3 線偏振旋轉(Linear-polarization rotation) 25
§ 3-4 卡諾楔形盒理論(Cano wedge method)[29] 27
§ 3-5 貝里曼矩陣(Berreman 4×4 matrix)[30] 28
§ 3-6 史托克參數(Stokes Parameters)[31] 31
第四章實驗方法與製程 32
§ 4-1 材料介紹 32
§ 4-1-1雙頻液晶 HEF951800-100 32
§ 4-1-2手性分子CB15 32
§ 4-2 實驗樣品製作 33
§ 4-2-1材料配置 33
§ 4-2-2 ITO基板處理過程 33
§ 4-2-3 基板表面配向處理 34
§ 4-2-4液晶盒製作過程 35
§ 4-2-5液晶盒厚度量測 35
§ 4-3 實驗架設 37
§ 4-3-1液晶盒樣品觀測 37
§ 4-3-2出射光偏振態量測 38
第五章結果與討論 39
§ 5-1 膽固醇液晶與楔形液晶盒 39
§ 5-1-1探討楔形液晶空盒厚度 39
§ 5-1-2量測CB15對HEF951800-100之HTP值 41
§ 5-2液晶分子扭轉率對於出射光偏振態之影響 43
§ 5-3 利用單面配向楔形液晶盒製作可調式連續線偏振旋轉器 50
§ 5-3-1 連續線偏振旋轉器 50
§ 5-3-2改變液晶層厚度探討出射光線偏振旋轉特性 59
§ 5-4 利用水平-圓形配向製作可調式連續偏振旋轉器 62
§ 5-4-1水平-圓對稱排列之偏振旋轉器 62
§ 5-4-2 改變液晶層厚度探討偏振旋轉特性 66
第六章結論與未來展望 79
§ 6-1 結論 79
§ 6-1-1 膽固醇液晶與楔形液晶盒 79
§ 6-1-2 液晶分子扭轉率對於出射光偏振態之影響 79
§ 6-1-3 利用楔形液晶盒製作可調式連續偏振旋轉器 79
§ 6-1- 利用水平-圓形配向製作可調式連續偏振旋轉器 80
§ 6-2 未來展望 81
參考文獻 82

參考文獻

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指導教授

鄭恪亭(Ko-Ting Cheng)

審核日期

2022-12-14

推文