Third-Order Nonlinear Optical Properties of Cyanine Dyes Adsorbed on Small Metal Particles

Abstract

Abstract We prepared dispersions of composite particles of thiacarbocyanine dye and colloidal silver or gold and examined an effect of the composite on the third-order nonlinear susceptibility (χ(3)) measured by using degenerate four-wave mixing method. The χ(3) of the dispersion was enhanced about 3.5 times the sum of those of dye solution and colloidal metal dispersion. A new absorption band (Δ=600 nm) which was bathochromically shifted from monomer band (Δ=551 nm) was formed and this band was related to the enhancement of χ(3).