Femtosecond dynamics of surface plasmons in one-dimensional plasmonic crystals: frequency-resolved optical gating (FROG)

Changes in the temporal profile of the electromagnetic field of a femtosecond pulse at the resonant excitation of plasmon-polaritons (PP) in the vicinity of the band gap edges of plasmonic crystal were demonstrated using the frequency-resolving optical gating (FROG) technique. It is shown that the broadening of the p-polarized pulse reflected from the plasmonic crystal is 20% more than in the case of s-polarized light in the vicinity of band gap edges where the lifetime of plasmon-polaritons is highest. The spectrum of the reflected pulse is significantly modified because of the resonant excitation of the PP in the crystal — the intensity decreases near the wavelengths corresponding to the band gap edges.