Surface plasmons of triangular cluster consisting of three 6H-SiC cylinders illuminated by H polarized cylindrical electromagnetic incident wave

Abstract

The surface plasmons properties of H cylindrical wave scattered by 2D triangular cluster consisting of three silicon carbide (6H-SiC) cylinders are investigated in this paper. Rigorous numerical procedures are used to study the plasmons resonances in such structure. The behaviors of the scattering cross section, the field distribution on the cylinder’s surface, spatial structure of the near field in the cluster for its symmetrical and nonsymmetrical excitation and scattering patterns are discussed and compared for different cases in terahertz wavelength range 10.3μm - 11.0μm. It is shown that coupled plasmon resonance can be transformed into space resonance inside of the cluster. Also, it was shown the existence of two different types of the coupled plasmon resonances in terahertz wavelength range 10.3μm – 11.0μm. One of then exist for the range wavelength where relative permittivity ϵSiC of the silicon carbide 0>ϵSiC>−1 and another - where ϵSiC<−1.