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Photopolarimetric investigations of the anchoring energy strength for a nematic liquid crystal on polyaniline boundary surfaces

V. BARNA1,* , G. STRANGI2, E.S BARNA1

Affiliation

  1. Faculty of Physics, University of Bucharest, PO Box Mg-11, 077125, Bucharest, Romania
  2. Licryl CNR-INFM and CEMIF. Cal (Center of Excellence Innovative Materials for Photonics), Department of Physics, University of Calabria, I-87036 Rende (CS), Italy

Abstract

We report a photopolarimetric study concerning with the influence of the boundary surfaces and the surface charge buildup on the anchoring energy in nematic liquid crystalline electo-optical cells. By employing a field-on approach combined with a high precision photopolarimetric polarization method we simultaneously measure the Stokes parameters of the transmitted light. By using a standard Saturation Voltage Method (SVM) we implicitly determine the anchoring energy values for two different sets of samples, having soft and hard rubbing boundary constraints. The polyaniline coated substrates play a key role in weakening the anchoring energy during a bias-controlled injection process and allows obtaining important physical information on the investigated systems..

Keywords

Nematic Liquid Crystal, Anchoring Energy, Photopolarimetriy, Saturation Voltage Method.

Submitted at: Nov. 9, 2008
Accepted at: Dec. 10, 2008

Citation

V. BARNA, G. STRANGI, E.S BARNA, Photopolarimetric investigations of the anchoring energy strength for a nematic liquid crystal on polyaniline boundary surfaces, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3403-3408 (2008)