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Tricritical-like behavior of the nonlinear optical refraction at the nematic-isotropic transition in the E7 thermotropic liquid crystal

  • V. M. Lenart
  • S. L. Gómez
  • I. H. Bechtold
  • A. M. Figueiredo Neto
  • S. R. Salinas
Regular Article

Abstract

We use Z-scan technique to investigate the nonlinear optical response of the thermotropic liquid crystal E7 in the neighborhood of the nematic-isotropic phase transition. The analysis of the data for the nonlinear optical birefringence is compatible with an effective critical exponent of the order parameter, β = 0.28 ± 0.03, which is close to the classical value, β = 0.25 , for a tricritical point. The nonlinear optical absorption in the nematic range depends on the geometrical configuration of the nematic director with respect to the polarization beam, and vanishes in the isotropic phase.

Keywords

Liquid Crystal Nematic Phase Isotropic Phase Tricritical Point Nonlinear Optical Response 
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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • V. M. Lenart
    • 1
  • S. L. Gómez
    • 1
  • I. H. Bechtold
    • 2
  • A. M. Figueiredo Neto
    • 3
  • S. R. Salinas
    • 3
  1. 1.Departamento de FísicaUniversidade Estadual de Ponta GrossaPRBrazil
  2. 2.Departamento de FísicaUniversidade Federal de Santa CatarinaSCBrazil
  3. 3.Instituto de FísicaUniversidade de São PauloSão Paulo, SPBrazil

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