Coherent Control of the Nonlinear Emission of Single Plasmonic Nanoantennas by Dual‐Beam Pumping (Advanced Optical Materials 20/2022)

An asymmetric plasmonic nanoantenna mediates the nonlinear mixing between ultrashort infrared laser pulses at frequency ω and 2ω. The third harmonic at ω + ω + ω and the sum frequency at ω + 2ω are coherent and degenerate at the visible frequency 3ω. Consequently, a relative time delay between the ω and 2ω pumps brings a strong modulation of the power at 3ω due to interference. This phase-dependent modulation, as presented in article number 2200757 by Michele Celebrano and co-workers, realizes an ultrafast coherent control scheme of nonlinear emission.