Nonlinear spectroscopy and picosecond transient grating study of colloidal gold

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Abstract
Measurements of the nonlinear dispersion of χ( 3 ) have been performed on the surface plasmon resonance of aqueous colloidalgold. An analysis of the observed dispersion has revealed that the T 1 and T 2 lifetimes for the plasmon excitation are extremely rapid (2 ps). Picosecond time‐resolved transient grating experiments on the same gold sol and organic dye solutions have confirmed that the nonradiative thermal decay of the metal particles occurs on the time scale of tens of picoseconds. The application of these methods to the study of ultrafast nonradiative relaxation mechanisms in molecular systems is discussed.