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15 October 2004 Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures
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We present results on DC field and light-induced photorefractive-like gratings in liquid crystal cells made with photosensitive polymer layers. Surface charge layers that develop on a liquid crystal-polymer interface are responsible for screening the liquid crystal bulk from an external DC field. These layers can be selectively discharged via polymer photoconductivity and lead to liquid crystal reorientation grating. Efficient two-beam coupling gain can arise from the reorientation grating for relatively high DC field (above 30 V). For lower voltages, strong diffraction can be observed that reduces the gain. Two-beam coupling gain and diffraction can also be controlled by experimental geometry and liquid crystal alignment. The simulated profile of electric field shows that its penetration depth depends on grating spacing.
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Malgosia Kaczmarek and Andriy Dyadyusha "Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures", Proc. SPIE 5518, Liquid Crystals VIII, (15 October 2004);

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