We have fabricated electrically switchable holographic gratings, using Polaroid Corporation’s DMP-128 photopolymer f illed with the nematic liquid crystal E7. It is shown that a coupled-wave theory that includes the effects of the birefringence of the liquid crystal must be used to explain the diffraction properties of these anisotropic volume gratings. Furthermore, a detailed comparison of theory and experiment provides information about the alignment of the liquid crystal within the polymer host.
J.J. Butler and M.S. Malcuit, “Diffraction Properties of Highly Birefringent Liquid-Crystal Composite Gratings,” Optics Letters, 25, 420-422 (2000). http://dx.doi.org/10.1364/OL.25.000420