Fig. 2: Measured ellipsometric difference curves for surface plasmon polariton excitations at different laser powers.
From: Ultrasensitive probing of plasmonic hot electron occupancies
a Differences in psi spectra and (b) differences in delta spectra. Note that delta values (b) are offset for better visibility. The inset shows the first derivative of the imaginary part of the dielectric function of gold determined in this study. Peak positions in the ellipsometric curves correspond to rapid changes in the dielectric function of gold, i.e. peaks in its first derivative.
