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Optical properties of a double-layer polymer/LC grating by UV irradiation process

A fabrication method and optical properties of a double- layer polymer/liquid-crystal (LC) grating are reported. The double-layer polymer/LC grating is fabricated by a simple single-step process with UV irradiation through a grating photomask, using a mixture of liquid crystal and prepolymer materials. This liquid crystal grating consists of two polymer/LC layers with a periodic relief structure. The alignment directions of liquid crystal molecules for the two layers are orthogonal to each other. The diffraction properties of the double-layer polymer/LC grating have been measured and compared with that of a single-layer one. Behaviors of the disclination lines have been also investigated under a voltage application. The results indicate that the double-layer polymer/LC grating has voltage-controllable polarization direction-independent diffraction properties.