Fig. 3: Time-correlation measurements of the plasmon generation via DFG.
From: Nonlinear co-generation of graphene plasmons for optoelectronic logic operations
a Sketch of the time-correlation experiment, DFG occurs only when the pump and the probe overlap in time. b–d The ΔIDFG maps corresponding to different fsp, when the graphene’s Fermi level is 0.1, 0.2 and 0.3 eV. Colour bar: normalized intensity. e–g The total ΔIDFG traces, when the graphene’s Fermi level is 0.1, 0.2 and 0.3 eV. The grey curves show the reference signal (background) when fpump − fprobe is far from the plasmonic resonances.
