National Changhua University of Education Institutional Repository : Item 987654321/15087
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題名: Interference Ring Patterns from Cholesteric Liquid Crystal Cells
作者: Huang, Chi-Yen;Hu, Chao-Yuan
貢獻者: 光電科技研究所
關鍵詞: Liquid crystals;Interference;Scattering;Defect;Focal conic domain
日期: 2005
上傳時間: 2013-01-07T02:10:34Z
出版者: The Japan Society of Applied Physics
摘要: An interference ring pattern is observed from cholestric liquid crystal cells. Qu�telet scattering light interference contributes to the ring, and defect walls among uniform aligned cholesteric liquid crystal domains serve as scatterers in the cell. A simple theory is developed to explain the observed scattering light interference in the far field condition. Changes in interference ring intensities and optical microscope images are investigated. Experimental results show that cell thickness and applied voltage significantly affect the number of defects and hence affect the ring intensity and the clarity of the observed ring pattern. The multiple diffuse reflections and the polarization changes of the incident light beams in the liquid crystal material affect the contrast ratio in the ring image, and the location of a specific order can be directed by controlling the incident angle. The results introduce the possibility of realizing defects and impurities in a liquid crystal device using scattering light interference. The liquid crystal cells may also serve as candidates for producing a conical interference ring.
關聯: Jpn. J. Appl. Phys., 44(7A): 5076-5081
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