FRACTALS - LOCALIZATION OF DIPOLE EXCITATIONS AND GIANT OPTICAL POLARIZABILITIES

Highly localized optical modes laser-excited on silver colloid fractal clusters were observed using photon scanning tunnelling microscopy (P STM). The spatial distribution of the modes excited shows the frequenc y and polarization selectivity suggested by numerical simulations. The localization of the optical excitations on fractals results in very h igh local fields leading to the huge enhancement of resonant Rayleigh, Raman and, especially, nonlinear light scattering. The experimental r esults verify the main concepts of the developed resonant optical theo ry of fractals.