Abstract
We report on the experimental realization of Cerenkov second harmonic generation and sum-frequency generation in a two-dimensional (2D) LiTaO3 nonlinear photonic crystal. The ferroelectric domain wall enhanced Cerenkov radiations were created by the modulations induced corresponding to the reciprocal vectors along the direction of propagation of the fundamental beams. The (electric field) polarizations of the fundamental beams were found to affect the Cerenkov angles and the intensities of the radiations. In addition, the variations in the characteristics of the radiations varying with the wavelength of the incident fundamental waves were investigated.
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