Nematic Liquid Crystal Phase-Gratings for Reflective Spatial Light Modulators

The twisted nematic liquid crystal phase grating, using patterned alignment with opposite twist angles for reflective spatial light modulators, is analyzed with respect to operating mode, diffraction efficiency and operating voltage including the effect of disclination lines between opposite twist d...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 37; no. 5B; p. L587
Main Authors Lu, Minhua, Yang, Kei-Hsiung
Format Journal Article
LanguageEnglish
Published 01.05.1998
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Summary:The twisted nematic liquid crystal phase grating, using patterned alignment with opposite twist angles for reflective spatial light modulators, is analyzed with respect to operating mode, diffraction efficiency and operating voltage including the effect of disclination lines between opposite twist domains. In general, the high-field difflactive modes have lower operating voltages, slower response time and relatively higher contrast ratio than zero-field diffractive modes. We describe a high-field diffractive mode with a twist angle of approximately ±54° for opposite twist domains which achieves an optical efficiency of nearly 100% and an estimated contrast ratio greater than 300:1 for monochromatic light.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.37.L587