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The Domain Mode in Ferroelectric Liquid Crystals a Novel Electrooptical Process

Published online by Cambridge University Press:  25 February 2011

L. A. Beresnev,
M. Pfeiffer,
S. A. Ptkin and
W. Haase
L. A. Beresnev
Affiliation:
Institut für physikalische Chemie, Technische Hochschule Darmstadt, Petersenstraβe 20, W-6100 Darmstadt, FRG.
M. Pfeiffer
Affiliation:
Institut für physikalische Chemie, Technische Hochschule Darmstadt, Petersenstraβe 20, W-6100 Darmstadt, FRG.
S. A. Ptkin
Affiliation:
Institut für physikalische Chemie, Technische Hochschule Darmstadt, Petersenstraβe 20, W-6100 Darmstadt, FRG.
W. Haase
Affiliation:
Institut für physikalische Chemie, Technische Hochschule Darmstadt, Petersenstraβe 20, W-6100 Darmstadt, FRG.
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Abstract

Novel electrooptical effects in ferroelectric liquid crystals with high spontaneous polarization (Ps ) are observed. They are connected with the formation of a modulated distribution of the macroscopic dipole moments of smectic layers if going along the layer normal. The period (D) of this modulation (ferroelectric domains) near the electrode surfaces (DS) and in the bulk (DB) of a FLC-specimen can differ appreciably, depending on an applied external voltage. The main role of the value of the effective spontaneous polarization is established. A variuos number of domain structures and corresponding diffraction patterns are observed under variation of frequency and amplitude of the external electric field. A simple explanation of the new electrooptical responses is proposed on the basis of interference and incommensurability of bulk and surface domains.

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References

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