Project B08: Physical Review B 2017
Dispersion of the nonlinear suspectibility in gold nanoantennas
Femtosecond optical pulses tunable in the near infrared are exploited to drive third harmonic generation (THG) and incoherent multiphoton photoluminescence (MPPL) in gold plasmonic nanoantennas. By comparing the yield of the two processes concurrently occurring on the same nanostructure, we extract the coherent third-order response of the antenna. Its contribution is enhanced at shorter excitation wavelengths allowing the observation of dispersion in the nonlinear susceptibility of gold.
Vanessa Knittel, M. P. Fischer, M. Vennekel, Tobias Rybka, Alfred Leitenstorfer und Daniele Brida
Phys. Rev. B 96, 125428 (2017)
DOI: 10.1103/PhysRevB.96.125428