Plasmon Mode Excitation on Graphene Layers via Obliquely-Incident Focused Wideband Pulses in Rigorous Time-Domain Algorithms

In this paper, a family of 3-D finite-difference time-domain schemes is developed in order to investigate electromagnetic wave interactions in graphene arrangements. The novel algorithm excites the computational space through a modified total-field/scattered-field formulation with a focused wideband pulse of oblique incidence. In particular, the arbitrary incidence angle is attained via a set of three Euler angles, with the excitation scheme employed to generate surface plasmonic modes on graphene micro-ribbons. To this aim, the wavelength of surface waves as a function of frequency along with the magnitude of the exited field are extracted for the cases of normal and oblique incidence. It is, also, proven that by suitably rotating the focus pulse system, the excited plasmonic mode magnitude is increased. Numerical results, indicate the benefits of the proposed method.