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Schematic illustration of the nonuniform polymer network formation by the selective UV polymerization: (a) before polymerization. (b) First step: double surface stabilization obtained by UV irradiation of both sides of the sample with . (c) Second step: bulk stabilization after UV illumination with .
SEM image of the fibrilous polymer network formed on the substrate surface. The network has regular periodicity of about corresponding to the periodicity of the cholesteric material.
Photographs of the cell, with ULH texture over the electrode area, taken between crossed polarizers at different voltages; (a) , (b) , and (c) . At high applied voltage, the cholesteric texture above the electrodes is unwound and therefore appears totally black without any residual birefringence coming from the polymeric network.
Electro-optic response for different applied voltages on application of a triangle wave voltage with frequency of .
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