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Proceedings Paper

The manufacture of a binary optic liquid crystal blazed grating and its electro-optical properties
Author(s): Kun Liu; Ziqiang Huang; Jimin Wang; Zhiyong Wu; Yangdong Sun; Lingjiang Kong
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Paper Abstract

A photoresist film was applied on the indium tin oxide (ITO) conductive glass which was coated with silver. The photoinduced changes of the photoresist film were achieved by exposure to UV lamp through a grating & lead pattern photomask. The photoresist film exhibited grating lines and lead patterns after development. The Ag-ITO double film coated with photoresist patterns was etched to double-layer electrode patterns by ion beam. After photoresists were stripped, silver grating electrodes were removed and ITO grating electrodes were coated with polyimide (PI) and treated by rubbing. The orientation was perpendicular to grating. The back electrode was a piece of ITO glass which was oriented by the same method. Nematic liquid crystal (LC) was injected into the grating cell. Other silver-leads were retained and connected with driver ICs and flex circuits. The binary optic liquid crystal blazed grating was fabricated. Step-shaped phase was obtained by applying a step-shaped voltage on LC grating electrodes. It formed blazed grating at one order and the diffraction angle can be shifted dynamically. The sample was checked up by the optical microscope and the He-Ne laser. The results indicate that the sample had clear grating structure and every grating electrode can be controlled separately. The range of the first order of diffraction angle was ±6° in theory. The diffraction efficiency decreased as the diffraction angle increased, and the maximum diffraction efficiency can exceed 80 %.

Paper Details

Date Published: 22 October 2010
PDF: 6 pages
Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76583A (22 October 2010); doi: 10.1117/12.867732
Show Author Affiliations
Kun Liu, Univ. of Electronic Science and Technology of China (China)
Ziqiang Huang, Univ. of Electronic Science and Technology of China (China)
Jimin Wang, Univ. of Electronic Science and Technology of China (China)
Zhiyong Wu, Univ. of Electronic Science and Technology of China (China)
Yangdong Sun, Univ. of Electronic Science and Technology of China (China)
Lingjiang Kong, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 7658:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology
Yadong Jiang; Bernard Kippelen; Junsheng Yu, Editor(s)

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