  We demonstrated theoretically that a circularly polarized electromagnetic
field substantially modifies electronic properties of a periodical chain of
quantum rings. Particularly, the field opens band gaps in the electron energy
spectrum of the chain, generates edge electron currents and induces the
Fano-like features in the electron transport through the finite chain. These
effects create physical prerequisites for the development of optically
controlled nanodevices based on a set of coupled quantum rings.
