Efficient Dispersive GSTC-FDTD Algorithm Using the Drude Dispersion Model

Metasurfaces are artificial sheets with sub-wavelength thickness and they two-dimensional equivalents of metamaterials. The generalized sheet transition conditions (GSTCs) have been recently proposed for electromagnetic analysis the metasurfaces. In GSTCs, metasurface is generally modeled as a zero-thickness. However, conventional finite-difference time-domain (FDTD) method not straightforwardly applied to analyze wave propagation in metsurface by harnessing GSTCs because exhibit electric magnetic discontinuities. Alternatively, GSTC-FDTD formulation highly suitable analyzing properties metasurfaces introducing virtual grids. Meanwhile, can be realized using 2-D materials such black phosphorus thus dispersion characteristics should considered. this work, we propose an efficient dispersive algorithm employing Drude model. Moreover, first time, numerical surface susceptibility inherent derived its accuracy investigated. Numerical examples illustrate high efficiency Drude-dispersive algorithm.