In this Letter, a method is proposed that utilizes three-dimensional finite-difference time-domain simulations of light propagation for restoring the effective Kerr nonlinearity of nanocomposite media. In this approach, a dependence of the phase shift of the transmitted light on the input irradiance is exploited. The reconstructed values of the real parts of the nonlinear refractive index of a structure of randomly arranged spheres are in good agreement with the predictions of the effective medium approximations.

中文翻译：

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使用时域有限差分模拟检索纳米复合材料的非线性折射率

在这封信中，提出了一种方法，该方法利用光传播的三维有限差分时域模拟来恢复纳米复合介质的有效Kerr非线性。在这种方法中，利用了透射光的相移对输入辐照度的依赖性。随机排列的球体结构的非线性折射率的实部的重构值与有效介质近似的预测非常吻合。