Sheng, YanSaltiel, SolomonNeshev, DragomirKoynov, KaloianKrolikowski, WieslawKivshar, Yuri2015-12-13June 2-4 29781557528698http://hdl.handle.net/1885/84204We 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.Keywords: Cherenkov radiations; Nonlinear diffraction; Periodic poling; Photonic structure; Polarization properties; Second harmonic generation; Short range orders; Theoretical models; Diffraction; Electron optics; Holographic interferometry; Lasers; Quantum electr20092016-02-24