Optical EngineeringWaveguide couplers induced optically over organic junction
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A new kind of waveguide and waveguide coupler formed in a nematic liquid crystal (lc) cell is created by means of a weak-intensity laser beam that propagates along the flat boundary between layers of lc and photoconductive polymer. To obtain a waveguide, the connection between the lc and polymer must be driven by the properly polarized voltage. The examined lc cells were of a common kind with indium-tin-oxide (ITO) uniform electrodes on both inner sides of a glass plate. The planar homogeneous alignment of the lc layer was confined by a poly (N-vinyl carbazole) (PVC) layer on one side and a polyimide layer on the opposite side. We applied the PVC doped with a photosensitizer as the photoconductive polymer and a nematic lc mixture of high birefringence. A waveguide was created along a light beam propagation path, and coupling between the waveguides was fabricated in the same way. The energy transfer between the waveguides was proved in properly prepared experiments for laser beam wavelengths equal to 532 nm and 632.8 nm. For both wavelengths, the outcomes of the experiments were of the same quality.