Abstract
Linear and nonlinear optical properties of metal fractal clusters are studied. Experimental evidence is presented proving that clusters possess unique optical nonlinearities, characterized by rapid response, broadbandness and enormously high values of nonlinear susceptibility. A 106 times enhancement of the DFWM signal has been observed experimentally in silver particles aggregated into clusters. For the first time frequency-and polarization-selective photomodification of fractal silver clusters has been realized.
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