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REFRACTIVE INDICES DETERMINATION OF A NEW NEMATIC LIQUID CRYSTAL

I. Palarie1,* , C. Florea2

Affiliation

  1. Faculty of Physics, University of Craiova, 13 A. I. Cuza Str., Craiova-200585, Romania
  2. Laboratoire de Signaux et de Télécommunications (SIGTEL) de l'ESIEE – Paris BP 99, 2 bd. Blaise Pascal, 93162 NOISY-LE-GRAND cedex France

Abstract

We report the determination of the refractive indices of a new nematic liquid crystal 4'-cyano-(4-chlor-benzyloxy)-azobenzene, within the spectral range [570 − 800] nm for various temperatures pertaining to the nematic phase range of [159.1 − 183] °C. In order to obtain the ordinary and extraordinary refractive indices, the wavelength dependence of the light intensity transmitted by the cell, filled with this nematic liquid crystal, has been recorded at various temperatures with respect to the incidental beam light, polarized orthogonal to, respectively parallel with the optical axis. By using the three-band model and a nonlinear fitting procedure, from the wavelength dependence of the transmitted light intensity we have obtained the parameters involved in the expressions of the refractive indices and we have computed the refractive indices..

Keywords

Liquid crystals, Refractive indices, Optical birefringence.

Submitted at: Feb. 21, 2005
Accepted at: March 23, 2005

Citation

I. Palarie, C. Florea, REFRACTIVE INDICES DETERMINATION OF A NEW NEMATIC LIQUID CRYSTAL, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 997-1007 (2005)