We have investigated dispersion curves of a third-order nonlinear optical susceptibility, around the surface-plasmon resonance energy for a Ag nanocrystal–glass composite by means of z-scan and degenerate four-wave mixing measurements. Real and imaginary parts of of the composite that contains Ag nanocrystals with an average diameter of 7 nm have been measured at room temperature. The imaginary part of exhibits a negative peak near the surface-plasmon resonance, and the largest negative value is electrostatic units (esu). The real part of changes from at the lower energy side of the surface-plasmon peak to at the higher energy side. We calculated dispersion curves for the composite assuming that the real and the imaginary parts of the dielectric constant of metal nanocrystals change by optical excitations that are due to the creation of hot electrons. The obtained dispersion curves show a characteristic feature that differs from the exciton system in semiconductors.
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