Principle and Applications of Plasmonic Superfocusing of THz Waves in Metallic V-groove Tapered Waveguides: Surface Plasmon Polaritons of THz Waves as a Complex System of Electrons and Electromagnetic Waves

Abstract

We explain the concept of THz plasmonics as an extension of conventional plasmonics in the optical region. The analytical theory of THz plasmonic superfocusing modes in metallic V-groove tapered waveguides is described in detail based on the quasi-separation of variables with perturbation methods. Applications of THz plasmonic superfocusing show that the concept of THz plasmonics is very useful in experiments.