GIANT FLUCTUATIONS OF LOCAL OPTICAL-FIELDS IN FRACTAL CLUSTERS

Giant fluctuations of the intensities of local optical fields in fract al clusters are established, dependent on a high Q factor (low dissipa tion) of an optical resonance. We have shown that the nonlinear-optica l enhancement by fractals is due to these fluctuations and not to a hi gh mean magnitude of the local field. We have calculated the distribut ion function P(G) of a relative local-field intensity G and found a ne w scaling dependence, P(G) is-proportional-to G(-epsilon), with the in dex epsilon independent of an excitation frequency and dissipation rat e.