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THE BIREFRINGENCE OF THIN FILMS OF SOME NEMATIC LIQUID CRYSTALS

S. Picos1, G. Amarandei2, I. Diaconu3, D. Dorohoi2,*

Affiliation

  1. ”Gh. Asachi” Technical University of Iasi, Romania
  2. “Al.I.Cuza” University of Iasi, Faculty of Physics, Iasi, Romania
  3. “Gr. T. Popa” University of Medicine and Pharmacy, Medical Bioengineering Department, Iasi, Romania

Abstract

Birefringence and birefringence dispersion of N-(p-methoxy-benziliden)-p-n’-butylaniline (MBBA) as well as of poly-(pheny-methacrylic)-ester of cetyloxybenzoic-acid (PPMAECOBA) in tetrachloromethane (TCM) thin films have been determined. Measurements have been made, at room temperature, by two methods: interferometrically in monochromatic light and from the visible channeled spectra of thin layers. The dependence of the main refractive indices on light wavenumbers has been established using interferometrically estimated data. Having in view the good agreement between the birefringence computed with this dependence and the birefringence estimated from the visible channeled spectra, we consider that the established formulas could be used to give the visible main refractive indices of the studied NLC..

Keywords

Nematic liquid crystals MBBA, PPMAECOBA in TCM, Channeled spectra, Main refractive indices.

Submitted at: June 14, 2004
Accepted at: March 23, 2005

Citation

S. Picos, G. Amarandei, I. Diaconu, D. Dorohoi, THE BIREFRINGENCE OF THIN FILMS OF SOME NEMATIC LIQUID CRYSTALS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 787-793 (2005)