Giant absorption of light in quasi-zero-dimensional structures

We present a theory of electromagnetic field interaction with one-particle localized charged states emerging near the small spherical semiconductor or dielectric particles of radius a placed in dielectric matrices. In the framework of the dipole approximation we predict theoretically giant magnitudes of: 1) transitions oscillator strengths, and 2) the resonance light absorption cross-section sigma /sub aba/( omega , a). We suggest that these peculiarities can be observed experimentally in the systems under consideration. We also discuss the dependence of sigma /sub abs/ ( omega ,a) and the scattering cross-section sigma /sub abs/( omega ,a) on light frequency and radius a of one-particle localized excitations under different physical circumstances.