The Design and Fabrication of Liquid Crystal Grating and its Application in Traveling Electric Field

• Main Authors: Yao-Tian Chow, 周堯天
• Other Authors: Yu-Lung Lo
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/40961843580583055161

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === In this study, we propose a new design which combines the traveling electric field with the in-plane switch liquid crystal phase grating. The traveling of the electric field will lead to the rotation of the liquid crystal molecules, and the effective refractive index in the in-plane switching liquid crystal grating also has the traveling effect. The traveling of the effective refractive index can simulate the movement of the phase grating and it can improve several problems in the optical measuring system. In the previous optical measuring system, we use the PZT stage to drive the phase grating, but the PZT stage has the 『thermal drift』 problem and that will lead to the unstable of the measured signals. In our experiment, we use the Micro-Electro-Mechanical fabrication techniques to fabricate the IPS liquid crystal grating and this device can diffractive the incident light. In the analysis part, we use the Lcd Master to simulate the motion of the liquid crystal molecules in the IPS liquid crystal grating. The Lcd Master can also simulate the effect of the traveling electric field in the IPS liquid crystal grating. Finally, we analysis the traveling electric field in LiNbO3 and it can improve the drawback that the frequency response is too slow in liquid crystal.