We present the first (to our knowledge) exact dispersion relation for the transverse-magnetic surface plasmon polariton (SPP) modes of a plasmonic slot waveguide, which is formed by a nonlinear Kerr medium sandwiched between two metallic slabs. The obtained relation is then simplified to the case of small field intensities, while retaining nonlinear terms, to derive approximate dispersion equations for the symmetric and antisymmetric SPP modes.
© 2011 Optical Society of America
Original Manuscript: June 7, 2011
Revised Manuscript: July 27, 2011
Manuscript Accepted: August 1, 2011
Published: August 23, 2011
Ivan D. Rukhlenko, Asanka Pannipitiya, and Malin Premaratne, "Dispersion relation for surface plasmon polaritons in metal/nonlinear-dielectric/metal slot waveguides," Opt. Lett. 36, 3374-3376 (2011)