Efficient Dispersive GSTC-FDTD Algorithm Using the Drude Dispersion Modelopen access
- Authors
- Jang, Sangeun; Cho, Jeahoon; Jung, Kyung-Young
- Issue Date
- Jun-2022
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Dispersion; Metasurfaces; Finite difference methods; Time-domain analysis; Mathematical models; Computational modeling; Numerical models; Computational electromagnetics; dispersion; finite difference methods
- Citation
- IEEE ACCESS, v.10, pp.59486 - 59494
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE ACCESS
- Volume
- 10
- Start Page
- 59486
- End Page
- 59494
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/170091
- DOI
- 10.1109/ACCESS.2022.3180505
- ISSN
- 2169-3536
- Abstract
- Metasurfaces are artificial sheets with sub-wavelength thickness and they are two-dimensional equivalents of metamaterials. The generalized sheet transition conditions (GSTCs) have been recently proposed for electromagnetic analysis of the metasurfaces. In GSTCs, the metasurface is generally modeled as a sheet with zero-thickness. However, the conventional finite-difference time-domain (FDTD) method is not straightforwardly applied to analyze electromagnetic wave propagation in the metsurface by harnessing GSTCs because GSTCs exhibit electric and magnetic discontinuities. Alternatively, the GSTC-FDTD formulation is highly suitable for analyzing the electromagnetic properties of metasurfaces by introducing electric and magnetic virtual grids. Meanwhile, metasurfaces can be realized by using 2-D materials such as black phosphorus and thus the dispersion characteristics of metasurfaces should be considered. In this work, we propose an efficient dispersive GSTC-FDTD algorithm by employing the Drude dispersion model. Moreover, for the first time, the numerical surface susceptibility inherent to the dispersive GSTC-FDTD formulation is derived and its numerical accuracy is investigated. Numerical examples illustrate high efficiency of the proposed Drude-dispersive GSTC-FDTD algorithm.
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