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Broadband and tunable control of surface plasmon polaritons in thenear-infrared and visible spectrum is demonstrated theoretically andnumerically with a pair of phased nanoslits. We establish with simulationssupported by a coupled wave model that by dividing the incident power equallybetween two input channels, the maximum plasmon intensity deliverable to eitherside of the nanoslit pair is twice that for an isolated slit. For a broadbandsource, a compact device with nanoslit separation of the order of a tenth ofthe wavelength is shown to steer nearly all the generated plasmons to one sidefor the same phase delay, thereby achieving a broadband unidirectional plasmonlauncher. The reported effect can be applied to the design of ultra-broadbandand efficient tunable plasmonic devices.

Broadband and efficient plasmonic control in the near-infrared and visible via strong interference of surface plasmon polaritons