Coherent Control of the Nonlinear Emission of Single Plasmonic Nanoantennas by Dual?Beam Pumping

The control of nonlinear optical signals in nanostructured systems is pivotal to develop functional devices suitable for integration platforms. A possible mechanism exploiting coherent interactions between different processes. Here, this concept implemented by taking advantage the strong field enhancement and high nonlinearity provided plasmonic nanostructures. Two beams, one at angular frequency ?, corresponding telecom wavelength ? = 1551 nm, other 2?, are combined generate a sum-frequency signal 3? from single asymmetric gold nanoantennas. This interferes with third-harmonic radiation generated beam resulting modulation up 50% total depending on relative phase beams. Such large intensity accompanied rotation its polarization axis, due lack central symmetry nanostructure. demonstration that emission can be coherently controlled through difference two-color illumination represents promising route toward all-optical logic operations nanoscale manipulation.