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We describe a rigorous and physically transparent theory of enhancement of third order nonlinear optical processes achieved in plasmonic structures. The results show that while the effective nonlinear index can be enhanced by many orders of magnitude, due to high metal losses the most relevant figure of merit, the amount of phase shift per one absorption length remains very low.
We experimentally demonstrate coherent spectral phase encoded optical code-division multiple access that fully suppresses multiple access interference and speckle noise for the first time without the need for fast nonlinear time gating.
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