Theory of Light Scattering by Nematics
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.
KeywordsElastic Constant Piezoelectric Effect Piezoelectric Coefficient Orientational Relaxation Carrier Effect
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