Electric field induced order reconstruction in a nematic cell (Articolo in rivista)

Type
Label
  • Electric field induced order reconstruction in a nematic cell (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • Barberi R.; Ciuchi F.; Durand G.E.; Iovane M.; Sikharulidze D.; Sonnet A.M. ; Virga E.G. (2004)
    Electric field induced order reconstruction in a nematic cell
    in The European physical journal. E, Soft matter (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Barberi R.; Ciuchi F.; Durand G.E.; Iovane M.; Sikharulidze D.; Sonnet A.M. ; Virga E.G. (literal)
Pagina inizio
  • 61 (literal)
Pagina fine
  • 71 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 13 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica, Istituto Nazionale di Fisica della Materia, Universit`a di Calabria, Rende, 87036 Cosenza, Italy Laboratoire de Physique des Solides associ´e au CNRS (LA2), Universit´e Paris Sud, 91405 Orsay Cedex, France Department of Mathematics, University of Strathclyde, 26 Richmond Street, Glasgow G1 1XH, UK Dipartimento di Matematica, Istituto Nazionale di Fisica della Materia, Universit`a di Pavia, Via Ferrata 1, 27100 Pavia, Italy (literal)
Titolo
  • Electric field induced order reconstruction in a nematic cell (literal)
Abstract
  • We have experimentally observed the biaxial switching between two topologically distinct textures of a nematic liquid crystal cell submitted to a strong electric field. The effect is deduced from optical and electrical measurements across the cell. Above a static threshold, a bulk order reconstruction is observed, where the final nematic orientation in the centre becomes perpendicular to its initial one, inducing a total ? change of orientation across the cell. Using short electric field pulses, a higher dynamical threshold is observed. These experiments are explained by a Landau-de Gennes-Khalatnikov model. The threshold implies the local exchange of two eigenvalues of the nematic order tensor through intermediate biaxial states. The onset of the effect in a thin splay-bend wall decreases the static threshold by almost an order of magnitude. The model explains reasonably well the static and dynamic measurements within the present description of nematic biaxiality. (literal)
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