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。;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.
