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Technical aspects of dielectric spectroscopy measurements of liquid crystals

Perkowski P., Łada D., Ogrodnik K., Rutkowska J., Piecek W., Raszewski Z.

Opto-Electronics Review

2008

Vol. 16, No. 3

271-276

The dielectric spectroscopy measurements were performed for antiferroelectric liquid crystalline mixture. For this purpose, the cells with ITO electrodes were prepared. It was found that it is not possible to detect some important relaxation modes in Sm A*, Sm C*, and Sm CA* phases. The own cell mode (related to cell properties, i.e., capacity and resistivity) covers the dielectric response of liquid crystalline medium. Dielectric measurements in cells with gold electrodes were done to show all possible relaxations in antiferroelectric liquid crystals (Lcs).

Polarization bistability in a smectic-A liquid crystal.

Pura B., Wierzbicki M., Petykiewicz J., Ratusznik G.J., Wrzesiński Z.

Optica Applicata

2001

Vol. 31, nr 3

619-624

We report the measurements the of laser light polarization transmitted through the smectic-A phase of a liquid crystal placed inside the Fabry-Perot optical resonator. All four parameters of polarization were measured simultaneously by an ellipsometer of a special construction. Optical polarization bistability phenomenon was observed, in which polarization parameters of outgoing light depend nonlinearly on the intensity of the input beam. We propose a theoretical explanation of this phenomenon, based on the concept of orientational nonlinearity of liquid crystal's molecules