%A HUANG Ji-ping %T Theory of enhanced second-harmonic generation in some artificial materials %0 Journal Article %D 2007 %J Front. Phys. %J Frontiers of Physics %@ 2095-0462 %R 10.1007/s11467-007-0002-y %P 17-30 %V 2 %N 1 %U {https://journal.hep.com.cn/fop/EN/10.1007/s11467-007-0002-y %8 2007-03-05 %X We review the recent theoretical investigation on enhanced second-harmonic generation (SHG) in soft nonlinear optical materials based on ferrofluids, graded metallic films, and graded metal-dielectric films of anisotropic particl