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


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.


Liquid Crystal Nematic Phase Isotropic Phase Tricritical Point Nonlinear Optical Response 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    P.G. de Gennes, J. Prost, The Physics of Liquid Crystals, 2nd edition (Oxford University Press, New York, 1993).Google Scholar
  2. 2.
    E.F. Gramsbergen, L. Longa, W.H. de Jeu, Phys. Rept. 135, 195 (1986).ADSCrossRefGoogle Scholar
  3. 3.
    P.H. Keyes, J.R. Shane, Phys. Rev. Lett. 42, 722 (1979).ADSCrossRefGoogle Scholar
  4. 4.
    J.C. Filippini, Y. Poggi, Phys. Lett. A 65, 30 (1978).ADSCrossRefGoogle Scholar
  5. 5.
    A. Drozd-Rzoska, S.J. Rzoska, J. Ziolo, Phys. Rev. E 54, 6452 (1996).ADSCrossRefGoogle Scholar
  6. 6.
    J. Jadzyn, G. Czechowski, M. Ginovska, Phys. Rev. E 71, 052702 (2005).ADSCrossRefGoogle Scholar
  7. 7.
    R. McGraw, Phys. Rev. A 42, 2235 (1990).ADSCrossRefGoogle Scholar
  8. 8.
    P.K. Mukherjee, J. Phys.: Condens. Matter 10, 9191 (1998).ADSCrossRefGoogle Scholar
  9. 9.
    M. Sheik-Bahae, A.A. Said, T.H. Wei, D.J. Hagan, E.W. Van Stryland, IEEE J. Quantum Electron. 26, 760 (1990).ADSCrossRefGoogle Scholar
  10. 10.
    A.R.E. Brás, T. Casimiro, J. Caldeira, A. Aguira-Ricardo, J. Chem. Eng. Data 50, 1857 (2005).CrossRefGoogle Scholar
  11. 11.
    R.W. Boyd, Nonlinear Optics (Academic Press, San Diego, 1992).Google Scholar
  12. 12.
    P.B. Chapple, J. Staromlynska, J.A. Hermann, T.J. Mckay, R.G. Mcduff, J. Nonlin. Opt. Phys. Mater. 6, 251 (1997).ADSCrossRefGoogle Scholar
  13. 13.
    C.A. Carter, J.M. Harris, Appl. Opt. 23, 476 (1984).ADSCrossRefGoogle Scholar
  14. 14.
    F. Simoni, Nonlinear Optical Properties of Liquid Crystals and Polymer Dispersed Liquid Crystals (World Scientific, Singapore, 1997).Google Scholar
  15. 15.
    F.L.S. Cuppo, A.M. Figueiredo Neto, S.L. Gómez, P. Palffy-Muhoray, J. Opt. Soc. Am. B 19, 1342 (2002).ADSCrossRefGoogle Scholar
  16. 16.
    C.J. Adam, S.J. Clark, G.J. Ackland, J. Crain, Phys. Rev. E 55, 5641 (1997).ADSCrossRefGoogle Scholar
  17. 17.
    L. Li, H.J. Yuan, G. Hu, P. Palffy-Muhoray, Liq. Cryst. 16, 703 (1994).CrossRefGoogle Scholar
  18. 18.
    I.C. Khoo, S.T. Wu, Optics and Nonlinear Optics of Liquid Crystals (World Scientific, Singapore, 1993).Google Scholar
  19. 19.
    H.J. Yuan, L. Li, P. Palffy-Muhoray, Mol. Cryst. Liq. Cryst. 199, 223 (1991).CrossRefGoogle Scholar
  20. 20.
    W.H. de Jeu, Physical Properties of Liquid Crystalline Materials (Gordon and Breach, New York, 1980).Google Scholar
  21. 21.
    I. Chirtoc, M. Chirtoc, C. Glorieu, J. Thoen, Liq. Cryst. 31, 229 (2004).CrossRefGoogle Scholar
  22. 22.
    M. Marinelli, F. Mercuri, Phys. Rev. E 61, 1616 (2000).ADSCrossRefGoogle Scholar

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

Personalised recommendations