Dielectric response of ferroelectric liquid crystals in helical and twisted planar samples

The dielectric spectroscopy has been studied for both twisted and helical s tructures at the same sample. On cooling below the SmA phase the twisted st ructure spontaneously appeared. The helical structure could be generated by applying electric field of the frequency similar to 20 Hz. It is shown tha t the twisted structure exhibits higher relaxation frequency and lower diel ectric strength than the helical one. This result can be explained within t he present theory providing the existence of weak depolarization fields.