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Finite-Difference Frequency-Domain Method Simulates Electromagnetic Wave Propagation Properties of Parallel Plate Waveguide with Graphene and SiO2 Layers Host Publication: 20th Symposium of the IEEE Photonics Society Benelux Chapter Authors: G. He, G. Shkerdin, H. Alkorre and J. Stiens Publication Date: Nov. 2015
Abstract: Graphene draws massive interests due to its outstanding physical properties. During the recent years, extensive studies have shown its promising features in THz and infrared frequency ranges. However, the electromagnetic properties of graphene in microwave and millimeter wave spectrums are still not well understood. In this paper, we employed finite difference frequency domain (FDFD) method to simulate the electromagnetic (EM) behavior of parallel plate waveguide (PPWG) with graphene and buffer (SiO2) layer at 300 GHz. It is shown that the EM wave can be modulated with the presence of the graphene layer. As the thickness of graphene is infinitesimally compared to the operating wavelength, the non-uniform grid technique is used to overcome the challenge of this multi-scale issue. In order to verify the accuracy of the numerical method, the simulated results are compared with analytical calculations. The agreement of numerical and theoretical studies proves that electromagnetic wave propagation properties of PPWG can be modulated by changing buffer thickness or biased voltage on graphene. This feature of graphene can be used to design new type of electromagnetic devices, such as, compact electrically tunable phase shifter or amplitude modulators.
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