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Measuring electrical parameters of ferroelectric liquid crystals using universal current reversal method

  • Sood, N. (Engineering Materials Division, National Physical Laboratory) ;
  • Khosla, S. (Liquid Crystals Research Lab, Department of Physics, JCDAV College) ;
  • Singh, D. (Department of Physics, Punjabi University) ;
  • Bawa, S.S. (Engineering Materials Division, National Physical Laboratory)
  • Received : 2011.02.22
  • Accepted : 2011.03.23
  • Published : 2011.09.30
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Abstract

The universal current reversal method is used for the simultaneous measurement of response time (${\tau}$), azimuthal angle (${\varphi}_o$), spontaneous polarization ($P_S$), and rotational viscosity (${\gamma}_{\varphi}$) of two ferroelectric liquid crystals (FLCs). The application of AC field in FLCs results in reorientational current, which is further analyzed to obtain various parameters. The variation in the parameters with temperature follows the typical trend predicted by the theory. The theoretical curve fits well into the experimental data. Its comparison with traditional current reversal method is confirmed to address certain limitations of that method.

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