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1998 (1)
1Author    Heidrun Amm, Maren Grigutsch, Ralf StannariusRequires cookie*
 Title    Spatio-temporal Analysis of Electroconvection in Nematics  
 Abstract    We investigate electroconvection in nematic liquid crystals by means of optical microscopy. Time resolved optical images are used to study the director dynamics. For the first time we present instant images in the dielectric regime. A numerical simulation of the optical transmission patterns is performed on the basis of Fermat's principle. In the instant images of dielectric rolls, the periodicity of the observed optical pattern is equal to the wavelength Ao of the convection rolls. The well known low contrast 'stationary' optical texture observed in conventional experiments results from time averaging of these instant images; its wavelength is Ao/2. 
  Reference    Z. Naturforsch. 53a, 117—126 (1998); received December 10 1997 
  Published    1998 
  Keywords    Liquid Crystals, Pattern Formation, Electrohydrodynamic Instability, Optical Microscopy 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0117.pdf 
 Identifier    ZNA-1998-53a-0117 
 Volume    53