Method of inducing optical wave-guide in a homogeneous liquid crystal cell filled with nematic liquid crystal

摘要

The method is carried out in a crystalline cell consisting of two parallel dielectric limiting surfaces, between which is a layer of non-metallic liquid crystal (2) with a positive electrical anisotropy, on which the internal sides are placed a guiding layer (4) together with with belt electrodes (3) capable of generating a reorientating electric field generated by applied voltage of an amplitude above the threshold value,where the polarised linear optical signal emitted by the monochromatic source of electromagnetic radiation is propagated in an area between electrodes parallel to the limiting surfaces. In the first phase of the wave induction, a transient voltage shall be applied, at an amplitude exceeding repeatedly, from 2 to several dozen times, the threshold value and the short duration of action, not exceeding 500 milliseconds, where a rapid reorientation of the liquid crystal's non-magnetic molecules is induced, followed by a sustaining tension, stabilising the molecular reorientation obtained in the wave water,where the area of molecular reorientation is determined by selecting the width of the band electrodes (3) from one to several hundred wavelengths of the propagated optical signal.