亚波长结构新兴波导中脉冲传输的全矢量模型I：克尔非线性
A full vectorial model for pulse propagation in emerging waveguides with subwavelength structures part I: Kerr nonlinearity
摘要：
脉冲通过具有亚波长特征、非均匀横向结构和高折射率对比度的波导的传播在存在非线性效应的情况下不能使用现有模型准确地描述。在这里，我们报告了一个广义的全矢量模型的非线性脉冲传播的发展，并表明，与标准的脉冲传播公式，z分量的导模起着关键作用，这些新的结构，并导致广义定义的非线性系数$γ,$ $A_{eff}$，和模式的正交性。虽然新的定义在某些限制下降低到标准定义，但对于新兴的波导和微结构光纤，预测了显著的差异，包括$\sim2$的因子，$γ$的值更高。
英文摘要：
The propagation of pulses through waveguides with subwavelength features, inhomogeneous transverse structure, and high index contrast cannot be described accurately using existing models in the presence of nonlinear effects. Here we report the development of a generalised full vectorial model of nonlinear pulse propagation and demonstrate that, unlike the standard pulse propagation formulation, the z-component of guided modes plays a key role for these new structures, and results in generalised definitions of the nonlinear coefficient $γ,$ $A_{eff}$, and mode orthognality. While new definitions reduce to standard definitions in some limits, significant differences are predicted, including a factor of $\sim2$ higher value for $γ$, for emerging waveguides and microstructured fibers.
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