中心对称材料构成的光子晶体的有效二阶极化率
Effective Second Order Susceptibility in Photonic Crystals Composed from Centro-Symmetric Materials
摘要：
讨论了一种在由中心对称材料制成的非中心对称光子晶体（PC）中获得有效体二阶极化率的方法。该效应是基于电四极效应、强电磁模式变形和来自PC的不同部分的对体极化的非均匀贡献。所需的对称性破缺是在宏观尺度上的PC单胞。所得到的结构chi_str^（2）与普通非线性材料的二阶极化率相当。相位匹配可以通过在PC的制造期间引入对称调制（准相位匹配）来实现。
英文摘要：
A technique for obtaining efficient bulk second order susceptibility in non centro-symmetric Photonic Crystals (PC) made from centro-symmetric materials is discussed. The effect is based on the electric quadrupole effect, strong electromagnetic mode deformation and non homogeneous contribution to volume polarization from different parts of the PC. The required symmetry breaking is introduced on the macroscale of the PC unit cell. The obtained structural chi_str^(2) is comparable with the second order susceptibility of ordinary non-linear materials. Phase matching can be achieved by introducing symmetry modulation (Quasi Phase Matching) during fabrication of the PC.
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