Nonlinear nanofocusing in tapered plasmonic waveguides.
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.
Davoyan
Arthur R
AR
Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Shadrivov
Ilya V
IV
Zharov
Alexander A
AA
Gramotnev
Dmitri K
DK
Kivshar
Yuri S
YS