Low-frequency modes in ferroelectric liquid crystals

Milada Glogarova; Vladimira Novotna; H. Sverenyak; Alexej M. Bubnov

doi:10.1117/12.299954

1 February 1998 Low-frequency modes in ferroelectric liquid crystals

Milada Glogarova, Vladimira Novotna, H. Sverenyak, Alexej M. Bubnov

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299954
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Dielectric dispersion has been studied in the frequency range of 10Hz divided by 1MHz in liquid crystals with 2- alkoxypropriate chiral group. Two of them exhibit the spontaneous helix twist inversion in the SmC* phase. The dispersion reveals two modes, dielectric strengths as well as relaxation frequencies of which exhibit a strong dependence on the sample thickness. Mode 1 with the relaxation in the kHz range is the Goldstone mode, which is combined with a thickness mode, but it becomes the pure thickness mode in the temperature range near the helix twist inversion temperature, where the helicoidal structure is unwound. This situation is reflected in the temperature dependence of characteristics parameters of mode 1. The lower frequency mode 2 is attributed to a mode connected with a non-homogeneous distribution of ionic space charge, which is localized near the sample surface.

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Milada Glogarova, Vladimira Novotna, H. Sverenyak, and Alexej M. Bubnov "Low-frequency modes in ferroelectric liquid crystals", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299954

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