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arXiv 0909.2672physics.optics
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非线性和阈值交叉光谱特征下表面等离子体激元的放大

Amplification of surface plasmon polaritons in the presence of nonlinearity and spectral signatures of threshold crossover

A. Marini, A. V. Gorbach, D. V. Skryabin, A. V. Zayats

摘要:

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。从麦克斯韦方程组出发,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了SPP模的形成,其强度与传输距离无关。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。

英文摘要:

We describe 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.

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