Symmetry filter using anisotropic self-diffraction in BaTiO3

摘要

Using anisotropic self-diffraction in BaTiO$-3$/, we propose a novel optical symmetry filter which the filter allows us to distinguish a centro-symmetric pattern from a non-centro- symmetric pattern easily with scale invariance. This filter is self-referential, so no extra reference target is required. Both of the theoretical explanation and experimental demonstration are shown.