Multi-directional erenkov second harmonic generation in two-dimensional nonlinear photonic crystal.
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We study erenkov-type second-harmonic generation in a two-dimensional quasi-periodically poled LiNbO3 crystal. We employ a new geometry of interaction to observe simultaneous emission of multi-directional nonlinear erenkov radiation with comparable intensities. This opens a way to control the angle of erenkov emission by tailoring the nonlinearity of the material, which is otherwise intrinsically defined by dielectric constants of the medium and their dispersion.
author list (cited authors)
Sheng, Y., Roppo, V., Ren, M., Kalinowski, K., Cojocaru, C., Trull, J., ... Krolikowski, W.