透過多區域三維曲面電極製作可電控調焦之液晶透鏡

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姓名

池慶安(Ching-An Chih) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

透過多區域三維曲面電極製作可電控調焦之液晶透鏡
(Electrically tunable focusing liquid crystal lenses based on multiple-zone and three-dimensional curved electrodes)

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至系統瀏覽論文 (2027-6-30以後開放)

摘要(中)

本論文研究主題為利用3D曲面電極製作可電控調焦之大孔徑液晶透鏡，全文分為兩部分進行，第一部分為一區3D曲面電極液晶透鏡製作，使用正弦波函數設計曲面電極；第二部分為三區3D曲面電極液晶透鏡製作，此部分設計為藉由Fresnel lens的切分方式，並對其光學路徑差以2π整數倍為一單位做切分而生成三區電極結構，並探討該液晶透鏡之變焦特性、反應時間等性能。本論文之液晶透鏡模擬設計由國立臺灣大學光電所蘇國棟教授團隊執行，主要透過TechWiz LCD軟體輸出之數據資料點進行匹配，求得非球面函數後交由機械精密加工生產具立體結構之模具，再利用模具將結構轉印至塗佈於玻璃基板上之聚合物(NOA65)材料，且將ITO電極均勻濺鍍於凹面結構上形成3D曲面電極，接著，結合另一片鍍有ITO電極之玻璃基板並注入向列型液晶即可完成此液晶透鏡。本論文透過偏光顯微鏡檢視液晶分子於不同電壓下之排列，且使用相機記錄因相位差產生之同心環數目，而後觀察液晶透鏡成像表現，利用上述之結果驗證其屈光度是否與模擬設計相吻合。

摘要(英)

In this thesis, the research topic, divided into two parts, is the electrically tunable focusing large aperture liquid crystal lens with three-dimensional curved electrodes. The first part is the fabrication and analysis of a liquid crystal (LC) lens with one-zone and three-dimensional curved electrodes, having the shape similar to a sine wave function. The second part is the fabrication and analysis of another LC lens with three-zone and three-dimensional curved electrodes. The three-dimensional curved electrodes are designed by separating the ideal phase profile into three zones according to the structures of Fresnel lenses, and the optical path difference between any two adjacent zones of the three-dimensional electrode is an integer multiple of 2π. The performances of the LC lens, such as the electrically tunable focus, response time, and others, are also discussed. The design and simulation of these LC lenses in this study are completed by Professor Guo-Dung Su’s group at Graduate Institute of Photonics and Optoelectronics, National Taiwan University. Regarding to the simulations and experiments, fitting the data exported from the TechWiz LCD software can obtain the aspherical lens-like phase profile, and the mold with three-dimensional structure is manufactured by mechanical precision process. The three-dimensional structure is then transferred onto the NOA65-coated glass substrate by replication process. ITO electrodes are then sputtered onto the concave polymer structures to form the required 3D curved electrodes. Finally, the nematic LC is injected into an empty cell made of one substrate with three-dimensional curved electrodes and one ITO-coated glass substrate. To examine the consistency of the diopters between the experimental results and simulation design, a polarized optical microscope is adopted to observe the LC structures of the fabricated LC lens applied with electric fields, and the numbers of concentric rings provided by the phase difference between the center and the edge of LCs are recorded by a digital camera. Finally, the LC lens imaging performance is also experimentally elucidated.

關鍵字(中)

★ 多區域
★ 3D曲面電極
★ 大孔徑液晶透鏡

關鍵字(英)

★ multiple-zone
★ 3D curved electrodes
★ large aperture liquid crystal lens

論文目次

摘要 i
致謝 iii
目錄 iv
圖目錄 vi
符號說明 xi
第一章緒論 1
§ 1-1 前言 1
§ 1-2 研究動機 1
§ 1-3 文獻回顧 2
§ 1-4 論文架構 3
第二章液晶導論 5
§ 2-1液晶簡介 5
§ 2-1-1液晶的起源 5
§ 2-1-2 物質狀態分類 6
§ 2-2 液晶分類 7
§ 2-2-1 向列型液晶(Nematics) 7
§ 2-2-2 層列型液晶(Smectics) 8
§ 2-2-3 膽固醇型液晶(Cholesterics，簡寫N*) 10
§ 2-3液晶物理特性 12
§ 2-3-1光學異向性(Optical Anisotropy) 12
§ 2-3-2介電異向性(Dielectric Anisotropy) 16
§ 2-3-3連續彈性體理論(Elastic Continuum Theory) 18
第三章實驗相關理論 20
§ 3-1司乃爾定律(Snell’s law) 20
§ 3-2薄透鏡光學成像理論 21
§ 3-2-1共軛方程式(Conjugate Equation) 21
§ 3-2-2屈光度(Optical Power，簡稱K)與焦距(Focal length) 23
§ 3-3 液晶透鏡理論 24
§ 3-3-1 GRIN Lens 24
§ 3-3-2液晶透鏡焦距計算 25
§ 3-3-3液晶透鏡同心環 29
§ 3-3-4 Fresnel Lens切分相位原理 31
第四章實驗方法與過程 33
§ 4-1 材料介紹 33
§ 4-1-1正型向列型液晶E7 33
§ 4-1-2聚二甲基矽氧烷(Polydimethylsiloxane，簡稱PDMS) 34
§ 4-1-3 高分子聚合物(Norland Optical Adhesive 65，簡稱NOA65) 35
§ 4-1-4高分子聚合物(Norland Blocking Adhesive 107，簡稱NBA107) 36
§ 4-1-5導電高分子材料PEDOT:PSS 37
§ 4-1-6氧化銦錫(Indium Tin Oxide，簡稱ITO) 38
§ 4-2 實驗樣品製作 38
§ 4-2-1 PDMS翻模材料配置 38
§ 4-2-2 一區凸面與三區凹面結構模具製作 39
§ 4-2-3 ITO基板裁切與清洗過程 39
§ 4-2-4 ITO基板表面之水平配向處理 40
§ 4-2-5一區3D曲面電極液晶透鏡製作方法 40
§ 4-2-6三區3D曲面電極液晶透鏡製作方法 42
§ 4-3 液晶透鏡觀測與實驗架設 43
§ 4-3-1 偏光顯微鏡觀測液晶透鏡 43
§ 4-3-2 實驗架設 44
第五章實驗結果與討論 50
§ 5-1 液晶透鏡及3D曲面電極設計 50
§ 5-1-1 液晶透鏡設計簡介 50
§ 5-1-2一區3D曲面電極 50
§ 5-1-3三區3D曲面電極 53
§ 5-2一區3D電極曲面液晶透鏡 56
§ 5-2-1偏光顯微鏡下液晶透鏡拍攝結果與分析 56
§ 5-2-2於不同電壓下同心環數目之比較 58
§ 5-2-3液晶透鏡實際聚焦情形 60
§ 5-2-4液晶透鏡實體成像表現 61
§ 5-3三區3D曲面電極液晶透鏡 62
§ 5-3-1偏光顯微鏡下液晶透鏡拍攝結果與分析 63
§ 5-3-2於不同電壓下同心環數目之比較 65
§ 5-3-3液晶透鏡實際聚焦情形 68
§ 5-3-4液晶透鏡實體成像表現 72
§ 5-3-5反應時間 74
§ 5-3-6液晶透鏡與出射光偏振態之關係 77
第六章結論與未來展望 79
§ 6-1 結論 79
§ 6-1-1 一區3D曲面電極液晶透鏡 79
§ 6-1-2 三區3D曲面電極液晶透鏡 80
§ 6-2 未來展望 81
參考文獻 82

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指導教授

鄭恪亭(Ko-Ting Cheng)

審核日期

2022-9-15

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