Abstract

This work is aimed to the photopolarimetric characterization of the disorder evolution occurring in homeotropically aligned nematic liquid crystal films during the electrically induced Fréedericksz transition. The molecular director dynamics and the transversal reorientation modes are investigated by the analysis of the depolarization of the light beam emerging from the sample. Our measurements reveal unexpected depolarization effects at the transition, which we interpret in terms of director field unhomogeneity and defects creation.

© 2007 Optical Society of America

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  2. V. Fréedericksz and V. Zolina, "Forces causing the orientation of an anisotropic liquid," Trans. Faraday Soc. 29, 919 (1933).
    [CrossRef]
  3. M. Golubitsky and D. G. Schaeffer, Singularities and Groups in Bifurcation Theory: Vol. I, Applied Mathematical Sciences 51 (Springer-Verlag, New York, 1985).
  4. G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
    [CrossRef]
  5. M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
    [CrossRef]
  6. M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
    [CrossRef]
  7. A. Buka and L. Kramer, "Linear and Nonlinear Transient Patterns in the Splay Freedericksz Transition of Nematics," J. Phys.II, France 2, 315 (1992).
    [CrossRef]
  8. N. Scaramuzza, G. Strangi, and C. Versace, "Electro-Optic Behavior of a Non Polar Nematic Liquid Crystal and Its Mixture," Liq. Cryst. 28, 307 (2001).
    [CrossRef]
  9. C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
    [CrossRef]
  10. R. M. A. Azzam, "Beam splitters for the division-of-amplitude photopolarimeter," Opt. Acta 32, 1407 (1985).
    [CrossRef]
  11. R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
    [CrossRef]
  12. E. Masetti and M. P. de Silva, "Development of a novel ellipsometer based on a four-detector photopolarimeter," Thin Solid Films 264, 47 (1994).
    [CrossRef]
  13. K. Brudzewski, "Static stokes ellipsometer: general analysis and optimization," J. Mod. Opt. 38, 889 (1991).
    [CrossRef]
  14. D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
    [CrossRef]
  15. C. Brosseau and D. Bicout, "Entropy production in multiple scattering of light by a spatially random medium," Phys. Rev. E 50, 4997 (1994).
    [CrossRef]
  16. R. A. Chipma, "Polarizers, retarders and depolarizes," http://www.optics.arizona.edu/chipman/Publications/Polarizers_and_Polarized_Light_Preview.pdf.
  17. N. Eber, S. A. Rozanski, Sz. Nemeth, A. Buka, W. Pesch and L. Kramer, "Decay of spatially periodic patterns in a Nematic Liquid Crystal," Phys. Rev. E. 70, 061706 (2004).
    [CrossRef]
  18. S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
    [CrossRef] [PubMed]
  19. T. Tóth-Katona and J. T. Gleeson, "Distribution of injected power fluctuations in electroconvection," Phys. Rev. Lett. 91, 264501 (2003).
    [CrossRef]
  20. N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
    [CrossRef]

2005

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

2004

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

N. Eber, S. A. Rozanski, Sz. Nemeth, A. Buka, W. Pesch and L. Kramer, "Decay of spatially periodic patterns in a Nematic Liquid Crystal," Phys. Rev. E. 70, 061706 (2004).
[CrossRef]

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

2003

T. Tóth-Katona and J. T. Gleeson, "Distribution of injected power fluctuations in electroconvection," Phys. Rev. Lett. 91, 264501 (2003).
[CrossRef]

2001

N. Scaramuzza, G. Strangi, and C. Versace, "Electro-Optic Behavior of a Non Polar Nematic Liquid Crystal and Its Mixture," Liq. Cryst. 28, 307 (2001).
[CrossRef]

2000

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

1999

G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
[CrossRef]

1994

E. Masetti and M. P. de Silva, "Development of a novel ellipsometer based on a four-detector photopolarimeter," Thin Solid Films 264, 47 (1994).
[CrossRef]

D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
[CrossRef]

C. Brosseau and D. Bicout, "Entropy production in multiple scattering of light by a spatially random medium," Phys. Rev. E 50, 4997 (1994).
[CrossRef]

1992

A. Buka and L. Kramer, "Linear and Nonlinear Transient Patterns in the Splay Freedericksz Transition of Nematics," J. Phys.II, France 2, 315 (1992).
[CrossRef]

1991

K. Brudzewski, "Static stokes ellipsometer: general analysis and optimization," J. Mod. Opt. 38, 889 (1991).
[CrossRef]

1989

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

1988

R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
[CrossRef]

1985

R. M. A. Azzam, "Beam splitters for the division-of-amplitude photopolarimeter," Opt. Acta 32, 1407 (1985).
[CrossRef]

1933

V. Fréedericksz and V. Zolina, "Forces causing the orientation of an anisotropic liquid," Trans. Faraday Soc. 29, 919 (1933).
[CrossRef]

Azzam, R. M. A.

R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
[CrossRef]

R. M. A. Azzam, "Beam splitters for the division-of-amplitude photopolarimeter," Opt. Acta 32, 1407 (1985).
[CrossRef]

Bartolino, R.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

Bicout, D.

D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
[CrossRef]

C. Brosseau and D. Bicout, "Entropy production in multiple scattering of light by a spatially random medium," Phys. Rev. E 50, 4997 (1994).
[CrossRef]

Blake, G. I.

G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
[CrossRef]

Bramwell, S. T.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Brosseau, C.

D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
[CrossRef]

C. Brosseau and D. Bicout, "Entropy production in multiple scattering of light by a spatially random medium," Phys. Rev. E 50, 4997 (1994).
[CrossRef]

Brudzewski, K.

K. Brudzewski, "Static stokes ellipsometer: general analysis and optimization," J. Mod. Opt. 38, 889 (1991).
[CrossRef]

Bruno, V.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

Buka, A.

A. Buka and L. Kramer, "Linear and Nonlinear Transient Patterns in the Splay Freedericksz Transition of Nematics," J. Phys.II, France 2, 315 (1992).
[CrossRef]

Christensen, K.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Clerc, M. G.

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

de Silva, M. P.

E. Masetti and M. P. de Silva, "Development of a novel ellipsometer based on a four-detector photopolarimeter," Thin Solid Films 264, 47 (1994).
[CrossRef]

Eber, N.

N. Eber, S. A. Rozanski, Sz. Nemeth, A. Buka, W. Pesch and L. Kramer, "Decay of spatially periodic patterns in a Nematic Liquid Crystal," Phys. Rev. E. 70, 061706 (2004).
[CrossRef]

Elminyawi, I. M.

R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
[CrossRef]

Fortin, J.-Y.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Fréedericksz, V.

V. Fréedericksz and V. Zolina, "Forces causing the orientation of an anisotropic liquid," Trans. Faraday Soc. 29, 919 (1933).
[CrossRef]

Ghosh, N.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Gleeson, J. T.

T. Tóth-Katona and J. T. Gleeson, "Distribution of injected power fluctuations in electroconvection," Phys. Rev. Lett. 91, 264501 (2003).
[CrossRef]

Grosz, F. G.

R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
[CrossRef]

Gupta, P. K.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Gupta, S.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Holdsworth, P. C.W.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Jaisawal, V.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Jensen, H. J.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Kléman, M.

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

Kralj, S.

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

Kramer, L.

A. Buka and L. Kramer, "Linear and Nonlinear Transient Patterns in the Splay Freedericksz Transition of Nematics," J. Phys.II, France 2, 315 (1992).
[CrossRef]

Lise, S.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

López, J. M.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Martinez, A. S.

D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
[CrossRef]

Masetti, E.

E. Masetti and M. P. de Silva, "Development of a novel ellipsometer based on a four-detector photopolarimeter," Thin Solid Films 264, 47 (1994).
[CrossRef]

R. M. A. Azzam, E. Masetti, I. M. Elminyawi, and F. G. Grosz, "Construction, calibration, and testing of a four-detector photopolarimeter," Rev. Sci. Instrum. 59, 84 (1988).
[CrossRef]

Mathelitsch, L.

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

Mullin, T.

G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
[CrossRef]

Nagaya, T.

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

Nicodemi, M.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Petrossian, A.

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

Pinton, J.-F.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Pradhan, A.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Repnik, R.

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

Residori, S.

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

Riera, C. S.

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

Rozanski, S. A.

N. Eber, S. A. Rozanski, Sz. Nemeth, A. Buka, W. Pesch and L. Kramer, "Decay of spatially periodic patterns in a Nematic Liquid Crystal," Phys. Rev. E. 70, 061706 (2004).
[CrossRef]

Scaramuzza, N.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

N. Scaramuzza, G. Strangi, and C. Versace, "Electro-Optic Behavior of a Non Polar Nematic Liquid Crystal and Its Mixture," Liq. Cryst. 28, 307 (2001).
[CrossRef]

Schmitt, J. M.

D. Bicout, C. Brosseau, A. S. Martinez and J. M. Schmitt, "Depolarization of multiply scattered waves by spherical diffusers: Influence of the size parameter," Phys. Rev. E 49, 1767 (1994).
[CrossRef]

Sellitto, M.

S. T. Bramwell, K. Christensen, J.-Y. Fortin, P. C.W. Holdsworth, H. J. Jensen, S. Lise, J. M. López, M. Nicodemi, J.-F. Pinton, and M. Sellitto, "Universal fluctuations in correlated systems," Phys. Rev. Lett. 84, 3744 (2000).
[CrossRef] [PubMed]

Singh, R.P.

N. Ghosh, A. Pradhan, P. K. Gupta, S. Gupta, V. Jaisawal, and R.P. Singh, "Depolarization of light in a multiply scattering medium: Effect of the refractive index of a scatterer," Phys. Rev. E 70, 066607 (2004).
[CrossRef]

Strangi, G.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

N. Scaramuzza, G. Strangi, and C. Versace, "Electro-Optic Behavior of a Non Polar Nematic Liquid Crystal and Its Mixture," Liq. Cryst. 28, 307 (2001).
[CrossRef]

Svetec, M.

M. Kléman, "Defects in liquid crystals," Rep. Prog. Phys. 52, 555 (1989);R. Repnik, L. Mathelitsch, M. Svetec and S. Kralj, "Physics of defects in nematic liquid crystals," Eur. J. Phys. 24, 481 (2003).
[CrossRef]

Tavener, S. J.

G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
[CrossRef]

Tóth-Katona, T.

T. Tóth-Katona and J. T. Gleeson, "Distribution of injected power fluctuations in electroconvection," Phys. Rev. Lett. 91, 264501 (2003).
[CrossRef]

Vena, C.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

Versace, C.

C. Vena, C. Versace, G. Strangi, V. Bruno, N. Scaramuzza, and R. Bartolino, "Light depolarization effect by electrohydrodynamic turbulence in Nematic Liquid Crystals," Mol. Cryst. Liq. Cryst. 441, 1 (2005).
[CrossRef]

N. Scaramuzza, G. Strangi, and C. Versace, "Electro-Optic Behavior of a Non Polar Nematic Liquid Crystal and Its Mixture," Liq. Cryst. 28, 307 (2001).
[CrossRef]

Zolina, V.

V. Fréedericksz and V. Zolina, "Forces causing the orientation of an anisotropic liquid," Trans. Faraday Soc. 29, 919 (1933).
[CrossRef]

Dyn. Stab. Syst.

G. I. Blake, T. Mullin, and S. J. Tavener, "The Freedericksz transition as a bifurcation problem," Dyn. Stab. Syst. 14,299 (1999).
[CrossRef]

Eur. Phys. J. D

M. G. Clerc, T. Nagaya, A. Petrossian, S. Residori and C. S. Riera, "First-order Fréedericksz transition and front propagation in a liquid crystal light valve with feedback," Eur. Phys. J. D 28, 435 (2004).
[CrossRef]

II, France

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Figures (9)

Fig. 1.
Fig. 1.

Degree of polarization (curve a) and ellipticity (curve b) vs. the applied voltage V, the impinging light beam was left-handed circularly polarized.

Fig. 2.
Fig. 2.

Time behavior of both the degree of polarization (curve a) and the ellipticity (curve b), the applied voltage was kept fixed at 5.6 V RMS, the impinging light beam was left-handed circularly polarized.

Fig. 3.
Fig. 3.

Time behavior of the degree of polarization P for two different values of the applied voltage: 6 V RMS (a), 7 V RMS (b).

Fig. 4.
Fig. 4.

Time behavior of the degree of polarization (curve a) and ellipticity (curve b) for a planar BL001 cell. The applied voltage was switched between 0 and 2.56V RMS. The oscillations of the ellipticity denote the reorientation dynamics at the OFF→ON and the ON→OFF transients respectively, no depolarization effects were observed.

Fig. 5.
Fig. 5.

Observations by orthoscopic optical microscopy of the Fréedericksz transition in a homeotropic cell at different applied voltage: a) in absence of field; b) 5.4 V RMS c) 9 V RMS just after the Fréedericksz transition d) 9 V RMS when the defect-antidefect pattern is formed.

Fig. 6.
Fig. 6.

a) Degree of polarization measured by the repetition of the same observation (12 V RMS). b) Average of the measures showed in a) together with the exponential fit of its long time behavior P = P 0 + A e t T . Fitted parameters: P0 =0.87, A=-0.47, T=5.0s.

Fig. 7.
Fig. 7.

a) Δt (defined in the text) vs ε=V 2/V 2 TH -1 and the exponential fit (solid line) Δ t = Δ t 0 + A e ε ε 1 , fitted parameters: Δt0 =0.30s, A=9.2s, ε1 =0.11. b) The same for the domains size D = D + B e ε ε 2 , fitted parameters: D∞=1.03µm, B=5.4µm, ε2 =0.16.

Fig. 8.
Fig. 8.

Histograms of PMIN at different voltage.

Fig. 9.
Fig. 9.

Mean values of PMIN as function of the reduced voltage ε, together with the exponential fit (solid line) P min = P + P 0 e ε ε 3 , fitted parameters: P∞=0.16, P0 =2.2,ε3 =0.06.

Equations (4)

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Θ = 1 2 arctan ( S 2 S 1 ) ,
e = tan [ 1 2 arcsin ( S 3 ( S 1 2 + S 2 2 + S 3 2 ) 1 2 ) ] ,
P = k = 1 3 ( S K S 0 ) 2 .
τ 2 Δ t γ 1 D 2 K 33 π 2 ,

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