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We have observed third-harmonic generation by single nanorods in solution and investigated its excitation polarization dependence. Our findings demonstrate the possibility of using third-harmonic signals for correlation spectroscopy, in contrast to conventional fluorescence correlation spectroscopy.
We use a tightly focused ultrashort laser pulse to produce a third harmonic signal from an air-dielectric interface containing gold nanorods. When the fundamental frequency is resonant with the longitudinal plasmon of the nanorods, the third harmonic signal can be enhanced by more than 3 orders of magnitude.
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