D. Correas Serrano, J. S. Gomez Diaz, J. Perruisseau-Carrier, A. Alvarez Melcon
We propose the concept, synthesis, analysis and design of graphene-based plasmonic tunable low-pass filters operating in the THz band. The proposed structure is composed of a chemically-doped graphene strip deposit on a dielectric and a set of polysilicon DC gating pads located beneath it. This structure implements a stepped impedance low-pass filter for the propagating surface plasmons by adequately controlling the guiding properties of each strip section through graphene's field effect. A synthesis procedure is presented to design filters with desired specifications in terms of cut-off frequency and in-band and rejection characteristics. The electromagnetic modeling of the structure is efficiently performed by combining an electrostatic scaling law to compute the guiding features of each strip section with a transmission line and transfer-matrix framework, which is also validated via full wave simulations. Excellent performance is obtained for this frequency range in terms of roll-off, insertion losses (3 dB assuming a graphene relaxation time of \tau = 1 ps) and reconfiguration capabilities (around 50%). These results, together with the high miniaturization associated with plasmonic propagation, are very promising for the future use and integration of the proposed filters with other graphene and silicon-based elements in innovative THz communication systems
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http://arxiv.org/abs/1304.6320
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