  We discuss the applicability of holographically patterned polymers, polymer
dispersed liquid crystals, and nanoparticle-polymer composites as optical
elements for cold neutrons. Requirements concerning the spacing, thickness or
strength of the grating for certain types of neutron optical elements, e.g.,
2-port or 3-port beamsplitters, are discussed in the framework of a rigorous
coupled-wave analysis. Finally, a roadmap to neutron mirrors, e.g., for
interferometers, is drawn.
