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Competing polarization effects in a homeotropically aligned smectic liquid crystal

McKay, G. and MacKenzie, K.R. and Mottram, N.J. (2004) Competing polarization effects in a homeotropically aligned smectic liquid crystal. Ferroelectrics, 309. pp. 35-41. ISSN 0015-0193

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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.

Item type: Article
ID code: 2187
Keywords: SmA∗ liquid crystals, continuum theory, equilibrium configurations, polarization, flexoelectricity, Mathematics, Materials Science(all), Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Subjects: Science > Mathematics
Department: Faculty of Science > Mathematics and Statistics
Faculty of Science > Mathematics and Statistics > Mathematics
Related URLs:
    Depositing user: Dr Nigel Mottram
    Date Deposited: 05 Jan 2007
    Last modified: 04 Sep 2014 12:21
    URI: http://strathprints.strath.ac.uk/id/eprint/2187

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