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Abstract
Nonlinear refractive indexes of the dionedioximes metal complexes were measured by a surface plasmon resonance method. Extremely large nonlinear refractive index; −1.9×10−10 cm2/W, was obtained for the Pt(dmg)2 at a wavelength of 1.06μm. Index change over 10−3 was steadily realized without any defect in the sample film. The absorbance of the film at this wavelength is too small to measure. Nonlinear refractive indexes of Ni(dmg)2 and Pd(dmg)2 are about one order smaller than that of Pt(dmg)2. These values are still very large as non-resonant regions.