Keywords :
electromagnetic wave propagation; finite difference time-domain analysis; polaritons; surface plasmons; terahertz waves; THz frequency; disc-type splitter; dispersion material; electromagnetic wave propagation; fan-shaped regions; frequency-dependent FDTD formulation; grating regions; metal disc-shaped devices; metal-dielectric interface; microwave region prototype; split terahertz surface waves; spoof SPP; surface plasmon polariton propagation properties;
