摘要
Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve optical switch.At present,the mechanism of SPPM is still ambiguous.The debate mainly focuses on whether the phenomenon is caused by the nonlinear refractive index of the two-dimensional material or the thermal effect of the laser.The lack of theory limits the dimension of the phase modulation to the radius of the diffraction ring and the vertical imbalance.Therefore,it is urgent to establish a unified and universal SSPM theoretical system of two-dimensional material.
当强激光入射二维材料离散体时,透过的激光会出现自衍射环,这是一种空间自相位调制现象,可以用于测试非线性光学参数和实现光开关。现在,关于空间自相位调制现象的机理仍有争论,主要聚焦在是二维材料的非线性折射率主导还是激光的热效应主导。理论的缺失限制了相位调制的维度,只能调控衍射环的半径和竖直方向的失衡。因此,有必要建立一个普适的空间自相位调制理论体系。
基金
Project(6187031976)supported by the National Natural Science Foundation of China
