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arXiv 1209.3063physics.opticscond-mat.other
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金属本征非线性引起的级联二阶表面等离子体激元孤子

Cascaded Second-order Surface Plasmon Solitons due to Intrinsic Metal Nonlinearity

Pavel Ginzburg, Alexey Krasavin, Anatoly V. Zayats

摘要:

我们从理论上证明了在金属和线性介质的界面上存在级联的二阶表面等离子体孤子。金属自由传导电子等离子体中的非局域多极非线性导致了同向传播的表面等离子体激元光束在基频和二次谐波频率下的强相互作用。有效二维介质的有限元数值模拟明确地证明了孤子的形成,证实了理论结果。在SiO2/Ag界面上,对750/1550 nm波长对的5λ宽表面等离子体激元光束进行了非衍射传输,其损耗限制传输距离为100 μ m量级。在相位匹配条件下等离子体孤子的形成已被证明是有益的非衍射表面等离子体极化激元传播。

英文摘要:

We theoretically show the existence of cascaded second-order surface plasmon solitons propagating at the interface between metal and linear dielectric. Nonlocal multipole nonlinearities originating from free conduction electron plasma of a metal lead to strong interaction between co-propagating surface plasmon polariton beams at fundamental and second harmonic frequencies. Finite element numerical modelling for effective two-dimensional medium explicitly demonstrates the solitons formation, confirming the theoretical results. The non-diffractive regime of propagation has been demonstrated at silica/silver interface for 5λ wide surface plasmon polariton beams with the loss-limited propagation distance of the order of 100 um for the 750/1550 nm wavelengths pair. Plasmon-soliton formation in the phasematched conditions has been shown to be beneficial for nondiffractive surface plasmon polariton propagation.

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