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Birefringence of azo-dye doped nematic liquid crystals

C. MOTOC1, G. IACOBESCU2,*

Affiliation

  1. Faculty of Applied Sciences, University “Politehnica” Bucharest, Splaiul Independentei 313, Bucharest, 060032, Romania
  2. Faculty of Physics, University of Craiova, Str. A. I. Cuza 13, 200585, Craiova, Romania

Abstract

Changes into the birefringence of an azo-dye doped nematic liquid crystal, subjected to magnetic fields, were investigated using a transmission technique. Liquid crystal cells, with planar/homeotropic alignment, were examined under both Faraday and Voigt configurations, i.e. the magnetic field direction was parallel and perpendicular to the incident light (He-Ne laser beam, 632.8 nm), respectively. The rate of decreasing/increasing birefringence under magnetic field is discussed, as well as the influence of UV irradiation..

Keywords

Nematic liquid crystal, Azo-dyes, Birefringence, Circular birefringence.

Submitted at: Nov. 25, 2005
Accepted at: Jan. 26, 2006

Citation

C. MOTOC, G. IACOBESCU, Birefringence of azo-dye doped nematic liquid crystals, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 295-298 (2006)