本研究探討具有可切換聚焦功能之多模式光學補償片架構。利用調變液晶折射率，施加電壓於環狀電極上，以及採用雙層液晶來解決極化選擇性，我們提出兩種新式多聚焦模式之光學補償片設計架構。第一種架構將電極作數個圓形環狀分區，並施以高低不同之電壓驅動，以使每一區內液晶產生不同之光程調變量，而等效於一梯度折射率型(graded-index)折射透鏡。並可根據每一環狀電極之電壓極性而切換成正或負透鏡之不同模態。第二種架構則是採用菲涅耳(Fresnel)區帶環之模式，設計菲涅耳電極與互補電極，並結合高分子穩固型液晶(polymer stabilized liquid crystal, PSLC)技術以得到多種模態之特性。兩種架構可應用於具有自動對焦之相機的光學模組設計，用以補償鏡頭焦距，產生多種不同之焦點位置；亦可應用於需要多種聚焦特性之光學器件上。由初步之光學模擬與實驗已確認本研究架構之可行性，未來計畫執行期間將進一步分析液晶之光學特性以及實際完成元件之製作，並搭配鏡頭模組作成像系統之驗證。本研究規劃為三年期之計畫，第一年度主要著重於文獻與理論之探討，以及第一種架構之實作驗證；第二年則建立於第一年之成果，以雙層電極作補償片之改善；第三年則進行第二種架構之實作驗證，並整合光學鏡組作成像系統之特性驗證。This study investigates the configuration of optical compensators that havethe feature of switching focusing characteristics with multiple modes. Bymodulating the index of refraction of liquid crystals (LCs), applying voltageson the ring-type electrodes, and adopting dual LC layers to solve thepolarization selectivity, we propose two configurations of the opticalcompensators with multiple focusing modes. For the first type, the electrodesare divided into several circular ring divisions, which are applied with differentvoltages for resulting in different optical path modulations in the regions. Thatwill be effective to a graded-index refractive lens. Besides, the positive ornegative focusing mode can be switched by the polarization of applied voltageson the ring electrodes. For the second type, the Fresnel zone andcomplementary electrodes are adopted and accompanied with the technology ofpolymer stabilized liquid crystal (PSLC) for generating the purpose of multiplemodes. Both configurations can be used to the optical system design ofautofocusing cameras for compensating the focal length of the lens andgenerating different focal positions. Also, it can be applied to the opticalapparatus that requires multiple focusing characteristics.The preliminary optical simulations and experiments have been performedto convince the feasibility of the study. In the project execution, the furtheranalysis of optical properties of LCs and practical realization of the device willbe proceeded to. Furthermore, the device will be combined with the lensmodule for the verification of the image formation.This project is a plan with the duration of three years. The first year's goalwill be focused on the literature and theoretical study, and the practicalrealization of the first configuration. Based on the results, the improvement ofthe compensator by using dual-layer electrodes will be performed in the secondyear. Finally, the implementation of the third configuration and thecharacteristics of the image formation will be confirmed in the third year
