Active Control of Multiple, Simultaneous Nonlinear Optical Processes in Plasmonic Nanogap Cavities

Plasmonic structures are promising to enhance and control nonlinear optical processes as the subwavelength-scale elements not only increase the local electric field intensities, but also result in relaxed phase matching conditions. This opens the possibility to observe and further manipulate multiple nonlinear optical processes simultaneously, which would be forbidden in bulk crystals due to incompatible phase matching requirements. Here we...