说明：  光与超常介质相互作用时,光的磁场也变得很重要 。超常介质的色散磁导率导致光与超常介质的非线性相 互作用呈现出许多新特性。总结了超常介质中二阶非线性光学现象的国内外研究进展。
(As the light interacts with the metamaterial, the magnetic field of light becomes important. The dispersive magnetic permeability of metamaterials leads to the nonlinear interaction between light and metamaterials, and presents many new characteristics. The research progress of two order nonlinear optical phenomena in metamaterials is reviewed.)