Surface effect on goldstone mode in ferroelectric liquid crystals

Dielectric studies of a single component ferroelectric liquid crystal material, showing chiral nematic to smectic C* phase transition have been investigated using a thin, highly conducting electrode cells. The main emphasis was given to the Goldstone mode which comes due to phase fluctuations in tilt angle of the molecules in Sm C* phase. To see the surface effect on the behaviour of Goldstone mode, one of the electrodes of the cell was highly anchored. The dielectric permittivity, particularly due to Goldstone mode has been studied for positive and negative polarity of the bias field in Sm C* phase. The Goldstone mode behaves differently during the positive and negative polarity of the bias field. The unusual dielectric behaviour has been explained by considering the charge accumulation phenomenon. The results agree with the electro-optical studies.