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Curved textures of ferroelectric smectic C* liquid crystals produce spacecharge when they involve divergence of the spontaneous polarization field.Impurity ions can partially screen this space charge, reducing long rangeinteractions to local ones. Through studies of the textures of islands on verythin free-standing smectic films, we see evidence of this effect, in whichmaterials with a large spontaneous polarization have static structuresdescribed by a large effective bend elastic constant. To address this issue, wecalculated the electrostatic free energy of a free standing film offerroelectric liquid crystal, showing how the screened coulomb interactioncontributes a term to the effective bend elastic constant, in the static longwavelength limit. We report experiments which support the main features of thismodel.

Role of electrostatics in the texture of islands in free standing ferroelectric liquid crystal films