Abstract
In this research, we built anisotropic diffraction gratings in Polymer Dispersed Liquid Crystal (PDLC) by using two coherent laser beams with intensity-modulation light, resulting in periodical uniform Liquid Crystal(LC) director orientation due to the recording time and phase separation. Higher diffraction efficiencies can be obtained by longer recording time that significantly changed the orientation of the LC to become twisted 90 degree from perpendicular alignment to parallel with grating vector. Longer recording time induced continuous phase separation and large density of LC droplet which finally almost completed grating configuration has been observed. By the addition of ultraviolet exposure, polymerization of unreacted monomer occurred and the diffraction efficiency increased again.
