Frequency Dependent Polarization Reversal and the Response Time of Ferroelectric Liquid Crystal by Triangular Wave Method

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Abstract
Dynamic processes of molecular reorientation of thin (10 µm) well aligned film of ferroelectric smectic C (DOBAMBC) have been studied with a triangular wave by observing a current signal due to polarization realignment at different frequencies. The peak due to polarization reversal shifts along the abscissa axis with the increase in frequency of the triangular pulses. The peak originates from both a surface and interior molecular reorientation, switches amongst uniform up(UU) ↔ twisted(TI) ↔ uniform down(UD) states and shifts due to their composite response time. The method also provides an estimate for the response time by comparing the occurrence of the peak at two known frequencies.