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Studies of thin smectic C∗ films by X-ray reflectivity

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  • Marinov, O.
  • Olbrich, E.
  • Cohen, G.
  • Entin, I.
  • Davidov, D.

Abstract

The smectic order in thin and ultra thin films (150–600Å) of the chiral ferroelectric liquid crystal mixture ZLI-3654 is studied using the X-ray reflectivity technique. The spin cast films on various substrates (float glass, Si wafer, polymer coated glass, etc.) order spontaneously with smectic layering parallel to the substrate surface. A simple model which assumes a sinusoidal density modulation can describe well the experimental reflectivity profiles. The X-ray reflectivity provides a method to evaluate the phases of the structure factor. We demonstrate, for the first time, that is possible to extract the molecular tilt angle, α, in ferroelectric liquid crystals from X-ray reflectivity measurements of ultra thin films. The temperature dependence of the tilt angle in the smectic C∗ phase are almost independent of the film thickness (down to ∼200 Å) and are similar to those in the bulk.

Suggested Citation

  • Marinov, O. & Olbrich, E. & Cohen, G. & Entin, I. & Davidov, D., 1993. "Studies of thin smectic C∗ films by X-ray reflectivity," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 200(1), pages 730-742.
    • Handle: RePEc:eee:phsmap:v:200:y:1993:i:1:p:730-742
    DOI: 10.1016/0378-4371(93)90581-N
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    1. Drescher, G. & Fellenberg, B., 1992. "Simulation of weakly correlated fields with an application to vehicle dynamics," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 34(5), pages 397-409.
    2. Buescher, P.A. & Roth, M.S. & Williams, D. & Goforth, C.M., 1991. "An evaluation of the impact of maternity care coordination on Medicaid birth outcomes in North Carolina," American Journal of Public Health, American Public Health Association, vol. 81(12), pages 1625-1629.
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