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We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
Suspensions of Au and Ag plasmonic nanoparticles, irradiated with 532-nm, ns-long pulses, exhibit nonlinear absorption, nonlinear scattering and saturable absorption. Laser-induced damage is suppressed by >100x when the solvent is toluene instead of water.
Aqueous suspensions containing pure gold nanoparticles and silica-gold core-shells are shown to exhibit different polarizibilities, thus allowing self-trapping of long needles of light. The different nonlinear mechanisms behind these processes are investigated.
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