Theory of Light Scattering by Nematics

  • Orsay Liquid Crystal Group
Conference paper


The fluctuations of the molecular alignment in pure nematic systems give rise to a strong scattering of light. A study of the scattering intensity vs. angle allows for a determination of (a) the Frank elastic coefficients. (b) the sum of the two piezoelectric coefficients introduced by Meyer. The frequency distribution of the scattered light can be related to the Leslie friction coefficients.

In impure (slightly conducting) nematics, the piezoelectric charges induced by the fluctuations of interest are screened out when the Debye Huckel radius is smaller than the optical wavelength. Thus, for strongly piezoelectric nematics, the light scattering properties might be sensitive to very small amounts of conducting impurities.


Elastic Constant Piezoelectric Effect Piezoelectric Coefficient Orientational Relaxation Carrier Effect 
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Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • Orsay Liquid Crystal Group
    • 1
  1. 1.Service de Physique des SolidesFaculté des SciencesOrsayFrance

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