Spatial Distribution of Light Scattered by p -Azoxyanisole in Applied Electric Field

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Abstract
Regular patterns of domain-like structure have been observed in the nematic range of p-azoxyanisole (PAA) when a transverse static electric field is applied. The spatial distribution of scattered light has been studied using optical Fourier transform techniques. In this way the relevant characteristics of the domain structure are particularly evident. The behaviour of this structure under different incident and scattered polarization conditions has been observed. A thermal hysteresis has been noted when the nematic range is reached from the liquid isotropic state. In this case, depending on how long the time spent and how high the temperature in the liquid state, the domain-like structure tends to be absent. This memory effect is cancelled out by a successive crystallization.

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