title: Nonlinear nanofocusing in tapered plasmonic waveguides.
abstract: We suggest using tapered waveguides for compensating losses of surface plasmon-polaritons in order to enhance nonlinear effects at the nanoscale. We study nonlinear plasmon self-focusing in tapered metal-dielectric-metal slot waveguides and demonstrate that, by an appropriate choice of the taper angle, we can effectively suppress the mode attenuation achieving stable propagation of a spatial plasmon soliton. For larger tapering angles we observe plasmon-beam nanofocusing in both spatial dimensions.
authors.affiliation: Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: Arthur R
authors.initials: AR
authors.lastname: Davoyan
authors.forename: Ilya V
authors.initials: IV
authors.lastname: Shadrivov
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Zharov
authors.forename: Dmitri K
authors.initials: DK
authors.lastname: Gramotnev
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar