Amplification of surface plasmon polaritons in the presence of nonlinearity and spectral signatures of threshold crossover.
Amplification of surface plasmon polaritons in the presence of nonlinearity and spectral signatures of threshold crossover.
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DOI：
10.1364/ol.34.002864
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发表时间：
2009-09
期刊：
影响因子：
3.6
通讯作者：
Andrea Marini;A. Gorbach;D. V. Skryabin;Anatoly V. Zayats
中科院分区：
文献类型：
--
作者：
Andrea Marini;A. Gorbach;D. V. Skryabin;Anatoly V. Zayats
本文研究了非线性效应对金属与外泵浦二能级原子放大介质界面上表面等离子体激元（SPP）传输的影响。利用麦克斯韦方程组，我们推导出了非线性色散规律，并证明了线性增益的非线性饱和导致形成了强度与传播距离无关的稳态SPP模式。过渡到平稳传播的状态类似于激光器中的阈值交叉，并导致SPP光谱变窄。
We describe the effects of nonlinearity on propagation of surface plasmon polaritons (SPPs) at an interface between a metal and an amplifying medium of the externally pumped two-level atoms. Using Maxwell equations we derive the nonlinear dispersion law and demonstrate that the nonlinear saturation of the linear gain leads to formation of stationary SPP modes with the intensities independent from the propagation distance. Transition to the regime of stationary propagation is similar to the threshold crossover in lasers and leads to narrowing of the SPP spectrum.