Abstract
Photosensitive samples of poly-methylmethacrylate containing about 10% residual monomer and the photo-initiator Cp2TiCl2 have been prepared. In a two-beam configuration the formation of a volume phase grating was photo-initiated, and, while the first grating was still growing, a second one was recorded after turning the sample by an arbitrary angle γ. As a result, two-dimensional gratings with the symmetry of a monoclinic crystal (a1 ≠ a2, γ ≠ 90°) were obtained and stabilized by a simple heat treatment.In a diffraction experiment the lattice constants and the amplitudes ΔnI and ΔnII of the overlapping gratings forming the crystal pattern could be deduced from its diffraction pattern and all the diffracted beams were assigned to their Miller indices (h, k).
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