Fig. 4: Measurement and simulation of the extinction and THG emission for antennas of various arm lengths.
From: Plasmonic mid-infrared third harmonic generation in germanium nanoantennas
a, c The normalized extinction (red circles) and third harmonic emission (blue diamonds) per unit antenna volume measured for double-rod antennas of various lengths at a gap width of 300 nm excited at 12 and 14 µm central wavelengths, respectively. b, d Corresponding FDTD simulation results for both excitation conditions
