| dc.description.abstract | 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. | en_US |