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Dichroic properties and the molecular tilt angle of a large-tilt angle antiferroelectric liquid crystal studied using polarized infrared spectroscopy

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Publication details

JournalIEEE Transaction of Ultrasonics Ferroelectrics and Frequency Control
DatePublished - 2006
Number of pages9
Pages (from-to)167-175
Original languageEnglish


The voltage dependencies of the dichroic properties for a homogeneously aligned sample of a partly fluorinated chiral smectic liquid crystal (S)-4-(1-methylheptyloxy carbonyl)phenyl 4'-[6-(3,4,4,4-tetrafluoro-3-trifluoromethylbutylcarbonyloxy) hexyloxy] biphenyl-4-carboxylate at various temperatures have been studied using polarized Fourier transform infrared spectroscopy. The temperature dependence of the molecular apparent tilt angle has also been determined. For the antiferroelectric SmC*(A) phase, the molecular apparent tilt angle is found to be close to 45 degrees for a temperature range of 65-80 degrees C. In the SmA* phase, an application of a sufficiently high electric fields causes a substantial increase in the orientational order parameter. This results probably from a change in the azimuthal distribution of the molecular directors around the tilt cone. The material is found to exhibit an extraordinary large surface electroclinic effect and its helix is considerably distorted by the surfaces.

    Research areas

  • smectic liquid crystals, infrared spectroscopy, orthoconics, antoferroelectric liquid crystals, PHASE

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