Low threshold and high contrast polymer dispersed liquid crystal grating based on twisted nematic polarization modulator |
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| Authors: | Z. Zheng F. Guo Y. Liu L. Xuan |
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| Affiliation: | (1) State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun, 130033, P.R. China;(2) Graduate School of Chinese Academy of Science, Beijing, 100039, P.R. China |
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| Abstract: | An electrically tunable mode is proposed to overcome the bottleneck problem of a conventional polymer dispersed liquid crystal (PDLC) grating and realize its low threshold and high contrast through an alignment-controlled PDLC. The results indicate that the threshold voltage VPP of the grating is as low as 0.75–0.8 V, the saturation voltage Vpp is 7 V and the contrast ratio of the grating reaches 245, which is about three times larger than the conventional PDLC grating. Stability testing indicates a stable state of contrast during a long time. PACS 42.40.Eq; 42.70.Df; 42.79.Kr |
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