Abstract
A spatial dependence of the refractive index perturbation induced in a 5-μm-thick polymer-dispersed liquid-crystal layer, by the use of a periodic electric field from the system of 50μm separated interdigitated electrodes, was investigated by measuring the induced in-plane birefringence of the sample. The efficiency of various diffraction orders was measured as a function of the applied voltage amplitude, and the dependence achieved for the 1st diffraction order was compared to the values calculated on the basis of the refractive index profile. The switching properties in response to the amplitude modulation of the driving voltage of various modulation depths were investigated. Our results demonstrate that a very effective phase modulation with response times considerably below 10ms can be achieved at the expense of slightly higher driving fields than needed for the bulk nematic liquid-crystal gratings.
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