Conical second harmonic generation in a two-dimensional chi(2) photonic crystal: a hexagonally poled LiTaO3 crystal |
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| Authors: | Xu P Ji S H Zhu S N Yu X Q Sun J Wang H T He J L Zhu Y Y Ming N B |
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| Institution: | National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China. |
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| Abstract: | A new type of conical second-harmonic generation was discovered in a 2D chi((2)) photonic crystal-a hexagonally poled LiTaO3 crystal. It reveals the presence of another type of nonlinear interaction-a scattering involved optical parametric generation in a nonlinear medium. Such a nonlinear interaction can be significantly enlarged in a modulated chi((2)) structure by a quasi-phase-matching process. The conical beam records the spatial distribution of the scattering signal and discloses the structure information and symmetry of the 2D chi((2)) photonic crystal. |
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