Figure 3
From: Origins of All-Optical Generation of Plasmons in Graphene
Intensity pattern generated from the interference of two beams in geometry (b) (θpump = 70°, θprobe = 50° λpump = 587 nm, λprobe = 617.53 nm). The temperature gradient in the sample follows this pattern and generates photothermal currents when thermalising. The pattern propagates, phase-matched to the difference frequency field, with wavevector q3 = q1 − q2.
