Laser-launched evanescent surface plasmon polariton field utilized as a direct coherent pumping source to generate emitted nonlinear four-wave mixing radiation

摘要

We develop a concept of surface plasmon polaritons (SPPs) based four-wavemixing (4WM), in which a laser-launched evanescent SPP field is utilized as acoherent pumping source to involve directly in a nonlinear 4WM process at thedielectric/metal interface. Conversion efficiency of the resulting 4WMradiation is expected to be dramatically increased due to the local-fieldenhancement effect. Feasibility of implementing this concept at the air/goldfilm and graphene flake/gold film interfaces is further examined by numericalsimulations. The concept shows intriguing promise for applications in newlyemerging nanophotonics, optoelectronics, and active plasmonics.