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Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission of liquid crystals: Comparison with experiments

B. K. P. Scaife1, A. A. Sigarev1,*, J. K. Vij1,†, and J. W. Goodby2

  • 1Department of Electronic and Electrical Engineering, Trinity College, University of Dublin, Dublin 2, Ireland
  • 2Department of Chemistry, University of York, York Y010 5DD, United Kingdom

  • *Permanent address: Moscow Institute of Physics and Technologies, Dolgoprudnij, Moscow 141700, Russia.
  • †Author to whom correspondence should be addressed; jvij@tcd.ie
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Phys. Rev. E 80, 021704 – Published 31 August, 2009

DOI: https://doi.org/10.1103/PhysRevE.80.021704

Abstract

The theory of the absorbance of a semi-infinite medium characterized by a second-rank dielectric tensor for the entire electromagnetic spectrum, as given by Scaife and Vij [J. Chem. Phys. 122, 174901 (2005)], is extended to include molecules of prolate spheriodal shape with longitudinal and transverse polarizabilities and to cover the case of elliptically polarized incident radiation. The theory is applied to the infrared transmission experiments of biaxial liquid crystals. It is found that the formula for the dependence on frequency and on angle of polarization of the absorbance A(ω,θ)=−log10[10A(ω,0) cos2 θ+(10−A(ω,π/2) sin2 θ)] is unaffected by the anisotropy of the molecules and by the elliptical polarization of the incident radiation. A small (±5%) discrepancy between theory and experiment has been found for bands with high absorbances. It is found that this discrepancy does not depend on birefringence of the sample but may depend on the precise method of absorbance measurement and on effects at the surface of the cell containing the liquid crystal under test.

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References (14)

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Phys. Rev. E 80, 021704– Published 31 August, 2009
  • Received 25 May 2009

© 2009 American Physical Society

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