Guided Plasmon Modes of a Graphene-Coated Kerr Slab
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We study analytically propagating surface plasmon modes of a Kerr slab sandwiched between two graphene layers. We show that some of the modes that propagate forward at low field intensities start propagating with negative slope of dispersion and positive flux of energy (fast-light surface plasmons) when the field intensity becomes high. We also discover that our structure supports an additional branch of low-intensity fast-light guided modes. The possibility of dynamically switching between the forward and the fast-light plasmon modes by changing the intensity of the excitation light or the chemical potential of the graphene layers opens up wide opportunities for controlling light with light and electrical signals on the nanoscale.
KeywordsSurface plasmons Plasmonics Kerr effect Nonlinear optics at surfaces
This work is supported by projects DPT-HAMIT, ESF-EPIGRAT, and NATO-SET-181, and by TUBITAK under Projects Nos. 107A004, 109A015, 109E301, and 110T306. E.O. and H.C. acknowledge partial support from the Turkish Academy of Sciences. I.D.R. gratefully acknowledges the Ministry of Education and Science of the Russian Federation for its Grant 14.B25.31.0002.
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