Nanoparticle chains coupled with surfaces and twisted chains as optical waveguides and antennas

Nanoparticle chains of two types are studied. The first type involves chains coupled with a dielectric slab. Such chains can operate as optical waveguides or antennas radiating surface wave beams. The second chain type involves twisted chains, where asymmetric chain elements are twisted in the transverse of the chain´s axis direction. Such chains support slow (bound) or fast (radiated) waves, with properties determined by the twist angle, periodicity, and plasmonic resonance properties.