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Optical properties of permanent gratings in liquid crystal doped with dye and carbon nanotube

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Abstract

Permanent gratings were written in planar nematic liquid crystal cells containing E7 doped with the azo dye Methyl Red and single-wall carbon nanotubes. An order parameter of S = 0.605 shows that the dye molecules align themselves very well with the liquid crystal’s director axis. A maximum absolute diffraction efficiency of 0.39% was found for cells doped only with 0.6% MR while a maximum of 2.6% was observed for cells doped with 0.6% MR and 0.002% CNTs. The data are consistent with permanent grating formation based on trans-cis photoisomerism of the dye molecules, followed by surface adsorption of the cis-isomer that leads to homeotropic alignment in the bright regions of the light illumination pattern. The robust permanent gratings were written without the aid of an external electric field and have remained stable for over 2 years.

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Acknowledgements

This research was supported by The Welch Foundation and Killgore Research Center.

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Authors and Affiliations

  1. Department of Physics, West Texas A&M University, Canyon, TX, 79016, USA

    Y. S. Suleiman, S. Ghosh, M. E. Abbasov & G. O. Carlisle

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  1. Y. S. Suleiman
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  2. S. Ghosh
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  3. M. E. Abbasov
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  4. G. O. Carlisle
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Correspondence to G. O. Carlisle.

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Suleiman, Y.S., Ghosh, S., Abbasov, M.E. et al. Optical properties of permanent gratings in liquid crystal doped with dye and carbon nanotube. J Mater Sci: Mater Electron 19, 662–668 (2008). https://doi.org/10.1007/s10854-007-9416-0

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  • DOI: https://doi.org/10.1007/s10854-007-9416-0

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