Fig. 1. Spectra of SHG and THG which are emitted by irradiation of 6 fs laser pulses in an organic superconductor, κ-(BEDT-TTF) 2 Cu[N(CN) 2]Br. Observation of the SHG in the centrosymmetric materials ...
(a) Schematic representation of the experiment. Local SHG signal is enhanced by irradiating an infrared laser pulse into the plasmonic nanogap between the gold tip and the gold substrate. (b) SHG ...