Combined plasmon-resonance and photonic-jet effect in the THz wave scattering by dielectric rod decorated with graphene strip

Sergii V. Dukhopelnykov (1) , Ronan Sauleau (2) , M. García-Vigueras (2) , Alexander I. Nosich (2)

1 KhNU - V.N. Karazin Kharkiv National University
2 IETR - Institut d'Électronique et des Technologies du numéRique

We consider the scattering of an H-polarized plane wave by an infinite dielectric rod with a conformal graphene strip of arbitrary angular width, placed at the rod rear side. Our analysis is based on the hypersingular integral equation for the current induced on the strip. Discretization of this equation is carried out by the Nystrom-type method, which has a guaranteed convergence. This meshless trusted computational instrument enables us to plot the dependences of the absorption cross-section (ACS) and the total scattering cross-section (TSCS) on the strip angular width and the frequency, in wide range from 1 GHz to 6 THz. We concentrate our analysis on studying the interplay between the broadband photonic-jet effect of dielectric rod and the reasonably high-Q resonances on the plasmon modes of graphene strip. It is found that as the photonic jet becomes brighter with higher frequencies, the plasmon-mode resonances become more intensive as well.

Keywords: dielectric rod; graphene strip; integral equation; photonic jet; plasmon resonance

Domains: Engineering Sciences [physics]

Sergii V. Dukhopelnykov, Ronan Sauleau, M. García-Vigueras, Alexander I. Nosich. Combined plasmon-resonance and photonic-jet effect in the THz wave scattering by dielectric rod decorated with graphene strip. Journal of Applied Physics, 2019, 126 (2), pp.023104. ⟨10.1063/1.5093674⟩. ⟨hal-02281677⟩