THE EFFECTIVE TENSOR OF DIELECTRIC PERMITTIVITY OF VERTICALLY ALIGNED FERROELECTRIC LIQUID CRYSTALS WITH DEFORMED HELIX
For the general case of biaxial anisotropy, we derive the analytic expression for the effective dielectric tensor that governs the electric-optical properties of vertically aligned deformed helix ferroelectric liquid crystals with subwavelength pitch. It is found that electric field dependence of the principal refractive indices of vertically aligned deformed helix ferroelectric liquid crystals cells exhibit the quadratic nonlinearity behavior might be interpreted as the orientation Kerr effect.