Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water
We report a universal approach based on the surface plasmon resonances (SPRs) attained in filamentation in water doped with gold nanoparticles for enhancing the nonlinear refractive index. The filament-induced supercontinuum spectrum in water overlaps with SPRs of gold nanospheres, which further leads to a modification on the Kerr nonlinear refraction index. In our experiment, the measured nonlinear refractive index (n2) in water doped with gold nanoparticles increases six times as compared with that in pure water. Such enhancement may be useful for filament-induced nonlinear applications with modest incident intensity.
作者单位：University of Shanghai for Science and Technology
East China Normal University
上海 华东师范大学 物理系
Yuan Shuai,Wang Lirong,Liu Fengjiang,Zhou Fengquan,Li Min,Xu Hui,Nie Yuan,Nan Junyi,Zeng Heping. Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water[J].Chinese Optics Letters,2019,17(3):03.