Cascaded Second-order Surface Plasmon Solitons due to Intrinsic Metal Nonlinearity
Abstract
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 5{\lambda} 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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Cite
@article{arxiv.1209.3063,
title = {Cascaded Second-order Surface Plasmon Solitons due to Intrinsic Metal Nonlinearity},
author = {Pavel Ginzburg and Alexey Krasavin and Anatoly V. Zayats},
journal= {arXiv preprint arXiv:1209.3063},
year = {2014}
}