Competing polarization effects in a homeotropically aligned smectic liquid crystal

G. McKay, K.R. MacKenzie, N.J. Mottram

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We examine the equilibrium configurations of a thin SmA∗liquid crystal film with its layers parallel to a lower substrate and a free upper surface. The molecules can exhibit variations in molecular tilt or twist around the smectic cone which are influenced by an in-plane electric field. We examine the competing effects of flexoelectricity and spontaneous polarization on the molecular tilt and twist. Our analysis is based upon a continuum theory for smectics which allows variation in the smectic layer spacing and the molecular tilt. For a fixed voltage the system can exhibit qualitatively different types of equilibrium profiles, depending on the relative sizes of the spontaneous polarization and flexoelectric contributions to the bulk energy. Energy and stability calculations allow us to predict physically relevant molecular configurations. These structures are closely related to synclinic and anticlinic arrangements in liquid crystal freestanding films.
LanguageEnglish
Pages35-41
Number of pages6
JournalFerroelectrics
Volume309
DOIs
Publication statusPublished - 2004

Fingerprint

Smectic liquid crystals
Liquid Crystals
Liquid crystals
liquid crystals
Polarization
polarization
Cones
Electric fields
configurations
Molecules
cones
Electric potential
Substrates
spacing
continuums
electric fields
energy
electric potential
profiles
molecules

Keywords

  • SmA∗ liquid crystals
  • continuum theory
  • equilibrium configurations
  • polarization
  • flexoelectricity

Cite this

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abstract = "We examine the equilibrium configurations of a thin SmA∗liquid crystal film with its layers parallel to a lower substrate and a free upper surface. The molecules can exhibit variations in molecular tilt or twist around the smectic cone which are influenced by an in-plane electric field. We examine the competing effects of flexoelectricity and spontaneous polarization on the molecular tilt and twist. Our analysis is based upon a continuum theory for smectics which allows variation in the smectic layer spacing and the molecular tilt. For a fixed voltage the system can exhibit qualitatively different types of equilibrium profiles, depending on the relative sizes of the spontaneous polarization and flexoelectric contributions to the bulk energy. Energy and stability calculations allow us to predict physically relevant molecular configurations. These structures are closely related to synclinic and anticlinic arrangements in liquid crystal freestanding films.",
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Competing polarization effects in a homeotropically aligned smectic liquid crystal. / McKay, G.; MacKenzie, K.R.; Mottram, N.J.

In: Ferroelectrics, Vol. 309, 2004, p. 35-41.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Competing polarization effects in a homeotropically aligned smectic liquid crystal

AU - McKay, G.

AU - MacKenzie, K.R.

AU - Mottram, N.J.

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N2 - We examine the equilibrium configurations of a thin SmA∗liquid crystal film with its layers parallel to a lower substrate and a free upper surface. The molecules can exhibit variations in molecular tilt or twist around the smectic cone which are influenced by an in-plane electric field. We examine the competing effects of flexoelectricity and spontaneous polarization on the molecular tilt and twist. Our analysis is based upon a continuum theory for smectics which allows variation in the smectic layer spacing and the molecular tilt. For a fixed voltage the system can exhibit qualitatively different types of equilibrium profiles, depending on the relative sizes of the spontaneous polarization and flexoelectric contributions to the bulk energy. Energy and stability calculations allow us to predict physically relevant molecular configurations. These structures are closely related to synclinic and anticlinic arrangements in liquid crystal freestanding films.

AB - We examine the equilibrium configurations of a thin SmA∗liquid crystal film with its layers parallel to a lower substrate and a free upper surface. The molecules can exhibit variations in molecular tilt or twist around the smectic cone which are influenced by an in-plane electric field. We examine the competing effects of flexoelectricity and spontaneous polarization on the molecular tilt and twist. Our analysis is based upon a continuum theory for smectics which allows variation in the smectic layer spacing and the molecular tilt. For a fixed voltage the system can exhibit qualitatively different types of equilibrium profiles, depending on the relative sizes of the spontaneous polarization and flexoelectric contributions to the bulk energy. Energy and stability calculations allow us to predict physically relevant molecular configurations. These structures are closely related to synclinic and anticlinic arrangements in liquid crystal freestanding films.

KW - SmA∗ liquid crystals

KW - continuum theory

KW - equilibrium configurations

KW - polarization

KW - flexoelectricity

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