Xiao Si, Zhang Yu, Ma Ying, Wang Yiduo, He Yilin, Zhang Jingdi, Jiang Yongqiang, Li Xiaohong, Yang Ruixin, He Jun, Wang Yingwei
Opt Lett. 2020 May 15;45(10):2850-2853. doi: 10.1364/OL.392689.
Two spatial self-phase modulation (SSPM) patterns were observed in suspensions of nanosheets. Two mechanisms were found to produce SSPM with different occurrence times and power dependence. The Type I (narrow) rings are attributed to the coherent third-order nonlinear optical Kerr effect, which induces self-diffraction in 2D materials, and the Type II (wide) rings are assigned to the contribution of a thermal effect. The nonlinear refractive index of is found to be 2.30×10 at 700 nm. The findings described here provide an explanation for the formation of rings in 2D systems due to SSPM.
在纳米片悬浮液中观察到两种空间自相位调制（SSPM）图案。发现有两种机制可产生具有不同出现时间和功率依赖性的SSPM。I型（窄）环归因于相干三阶非线性光学克尔效应，该效应在二维材料中引起自衍射，而II型（宽）环则归因于热效应的贡献。在700nm处发现其非线性折射率为2.30×10 。此处描述的研究结果为二维系统中由于SSPM形成环提供了解释。
