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arXiv 1409.7846nlin.PS
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非线性正负折射率波导阵列中的调制不稳定性

Modulation instability in nonlinear positive-negative index waveguide array

A. A. Dovgiy, A. I. Maimistov

摘要:

对具有正负折射率交替变化的非线性光波导阵列中的调制不稳定性进行了解析研究。求出了一个耦合非线性方程组的特解,这些解描述了连续波在纵向的传播。通过线性稳定性分析研究了这些波的不稳定性。的增益谱取决于所考虑的系统的不同参数:电磁场功率和向后向前波的振幅比,分析和数值研究。结果表明,在布拉格共振的情况下,连续波是稳定的。如果非线性只在一种波导中起作用,而另一种波导是线性波导,则不会发生调制不稳定性。在离焦波导中,由于布拉格共振,连续波的不稳定性降低。

英文摘要:

Modulation instability in a nonlinear optical waveguide array with alternating positive and negative refractive indices is investigated analytically. Particular solutions of a system of coupled nonlinear equations are found. These solutions describe propagation of the continuum backward and forward waves in longitudinal direction of considered system. Instability of these waves is investigated with a linear stability analysis. A gain spectrum depending on different parameters of considered system: electromagnetic field power and ratio of the backward to forward wave amplitude, is studied analytically and numerically. It was shown that in case of Bragg resonance the continuum waves are stable. If nonlinearity assists at one kind of waveguides only and another one is linear one then the modulation instability does not occur. Out of Bragg resonance in defocusing waveguides the instability of the continuum waves is reduced.

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