Nonlinear diffraction in two-dimensional nonlinear photonic structures with a short-range order
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We report on the observation of nonlinear diffraction and Cherenkov radiation via second-harmonic generation in two-dimensional nonlinear photonic structures with a short-range order of periodic poling. We discuss a theoretical model for describing this phenomenon and analyze the experimentally observed diffraction patterns and their polarization properties. 2009 Optical Society of America.