Abstract
Although in principle the possibility of enhancing the nonlinear-optical properties of materials by using composites containing noble metal particles has been known for some years,1 the first realization of a silver colloid-polymer composites was reported only recently.3,5 Degenerate four-wave mixing at certain wavelengths, off the silver resonance, shows an increase in |χ(3)| over that of the pure polymer.3 The first general theoretical discussion of an enhancement in the case of four-wave mixing in composites was given only very recently.4 To date only one technique has been used, and even for this no spectral dependence was realized.
© 1993 Optical Society of America
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