設計與製作高效率平面型偏極光分光器以應用於整合型導光板之偏光轉換器
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(2) Design and Fabrication of High Efficient Planer Polarizing Beam Splitter for Integrated Lightguide Polarization Converter. Student：Shih-Chia Hsu. Advisor：Dr. Han-Ping D. Shieh. Institude of Electro-Optical Engineering National Chiao Tung University. Abstract Low light efficiency is one significant technical barrier in the development of liquid crystal displays (LCDs), which usually causes low display brightness and high power consumption. Three factors that reduce LCDs light efficiency are：color filter loss, polarizer loss, and backlight unit loss. Thus, an integrated lightquide equipped with polarization conversion is proposed to increase light utilization.. The main contribution of this thesis is to design and fabricate a high efficient planer polarizing beam splitter (PBS) which is applied in the integrated lightquide equipped with polarization conversion. The sub-wavelength grating is designed by using effective medium theory (EMT) and rigorous coupled wave analysis (RCWA). Controlling the geometric parameters of the sub-wavelength grating allows for engineering the efficiency of light separation. The simulated results show that the sub-wavelength grating, which consists of double layers and is of period, duty cycle,.
(3) and aspect ratio of 0.2 µm , 50%, and 3, respectively, provides 80% of P-ray transmission efficiency and 97% of S-ray reflection efficiency in the visible spectrum range. In experiments, the designed sub-wavelength grating is fabricated by using electron beam lithography (EBL) technology. The measurements of the fabricated grating are compared with simulated results and found to be in reasonable agreement..
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