Abstract
The transient optical response of gold nanorods is investigated beyond the perturbative regime. Ultrafast pump-probe spectroscopy and semiclassical modeling of hot electrons reveal a universal mechanism presiding over the saturation of nonlinear plasmonic effects.
Highlights
The pump-probe experiments are performed with an amplified Ti:Sapphire system generating 100 fs pulses at 800 nm wavelength and 1 kHz repetition rate
Using gold nanorods dispersed in water as a model system, we combine ultrafast pump-probe spectroscopy and semiclassical modeling of hot electron dynamics to investigate the dependence of the plasmon transient response on the pump fluence
The two peaks correspond to the surface plasmon resonances (SPR) of the nanorods [2]: the peak at 520 nm is the transversal SPR (TSPR), whereas the second peak at around 625 nm is the longitudinal SPR (LSPR)
Summary
The pump-probe experiments are performed with an amplified Ti:Sapphire system generating 100 fs pulses at 800 nm wavelength and 1 kHz repetition rate. In this work we report an experimental and theoretical study of the transient optical response of plasmonic nanostructures beyond the perturbative regime.
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