Freedericksz transition mode

In this paper we have reviewed the structures appearing at onset of electro-convection in nematic liquid crystals. The influence of the relevant material parameters (ca and ao) and the role of the initial director alignment were explored. Our calculations using a linear stability analysis of the standard model of electroconvection (performed for zero frequency) revealed that four different scenarios characterized by different ranges of the wavenumber q can be identified (1) the Qf= 0 mode (a homogeneous deformation known as the Freedericksz transition) predicted and observed in cases C, D, E and H, which is... 

H. Qi, B. Kinkead, T. Hegmann, Unprecedented dual alignment mode and Freedericksz transition in planar nematic liquid crystal cells doped with gold nanoclusters. Adv. Funct. Mater. 18, 212-221 (2008)... 

Strictly speaking, when the mbbing angle <1> is not equal to zero the Freedericksz transition threshold is smeared. However, in a normally black IPS mode, the transmittance is proportional to the phase retardation 8 = Ind rdX of the LC cell asT sin 8/2). In the small voltage regime, the phase retardation is small and transmittance exhibits a threshold-like transition. 

Drevensek-Olenik, L, Jazbinsek, M., and Copic, M. (1999). Localized soft mode at optical-field-induced Freedericksz transition in a nematic liquid... 

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