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In this work we use femtosecond laser pulses of 800 nm wavelength to exciteand characterize the multiphoton luminescence emission of single goldnanoparticles. For excitation with 100 fs laser pulses we observe a two andthree photon emission dominated by radiative electron hole pair recombination,while the emission is caused by radiative plasmon decay for excitation with 500fs pulses. For single gold nanorods with different aspect ratios, we study theinterplay between the particle plasmon and electron hole pairs, which enablesus to develop a quantitative model to fully describe the two and three photonluminescence emission of single gold nanoparticles.

Two and three photon excited luminescence of single gold nanoparticles:  Switching between plasmon- and electron-hole-pair emission by ultrashort  laser pulses