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Influence of a helical pitch on orthoconic antiferroelectric liquid crystals performance

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Orthoconic antiferroelectric liquid crystals, whose half cone angle is 45°, are of interest in display technology because they are capable of providing greyscale in passively addressing waveform while exhibiting very good contrast. However, orthoconic antiferroelectrics having short pitch are difficult to be aligned, this makes surface stabilized alignment unfeasible. In this case, dynamic behaviour is usually poor, avoiding electronic addressing with standard electronics. In this work, we report the helical pitch measurements of OAFLC mixtures and we compare electrooptical performance of high and low pitch OAFLCs.
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  • Dpto. Tecnología Fotónica, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, E-28040 Madrid, Spain, n_bennis@tfo.upm.es
Bibliografia
  • [1] J. M. Oton, X. Quintana, P. L. Castillo, A. Lara, V. Urruchi, and N. Bennis: Antiferroelectric liquid crystal displays. Opto-Electron. Rev. 12, 236-269, 2004.
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  • [3] S. Lagerwall, A. Dahlgren, P. Jagemalm, P. Rudquist, K. D'have, H. Pauwels, R. Dąbrowski, and W. Drzewiński: Unique electro-optical properties of liquid crystals designed for molecular optics. Adv. Funct. Mater. 11, 87-94, 2001.
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  • [7] C. V. Brown and E. E. Kriezis: Surface-stabilized ferroelectric liquid-crystal diffraction gratings with micrometer-scale pitches. Appl. Opt. 43, 5287-5294, 2004.
  • [8] Tee Cath, W. A. Crossland, T. D. Wilkinson, and A. A. Davey: Binary phase modulation using electrically addressed transmissive and silicon backplane spatial light modulators. Opt. Eng. 39, 2527-2534, 2000.
  • [9] D. Engström, M.J. O'Callaghan, C. Walker, and M. A. Handschy: Fast beam steering with a ferroelectric-liquid-crystal optical phased array. Appl. Opt. 48, 1721-1726, 2009.
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  • [12] W. Rejmer, M. Żurowska, R. Dąbrowski, K. Czupryński, Z. Raszewski, and W. Piecek: An influence of the fluorosubstitution and the spacer length on the phase transitions and helical pitch value in high tilted antiferroelectric esters. Mol. Cryst. Liq. Cryst. 509, 937-947, 2009.
  • [13] M. Żurowska, R. Dąbrowski, J. Dziaduszek, K. Skrzypek, M. Filipowicz, W. Rejmer, K. Czupryński, N. Bennis, and J. M. Otón: Influence of alkoxy spacer length and fluorosubstitution of benzene ring on mesogenic and spectral properties of high tilted antiferroelectric 4'-(S)-1-(methylheptyloxycarbonyl)biphenyl-4-yl-4-(2,2,3,3,4,4,4-heptafluorobutoxy)alkoxy-benzoates. J. Mater. Sci. (in press).
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Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAD-0020-0012
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