Optical and electro-optical behaviour of a liquid crystal helicoidal structure

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Abstract
Optical and electro-optical properties of twisted nematic or cholesteric structures are very similar. For these structures the nature of the output optical wave is given when the incident light polarization is parallel to the first encountered molecules. The electro-optical behaviour is studied in the two following cases : the electric field is parallel or perpendicular to the molecules at rest. (The dielectric anisotropy of molecules is positive)