Modified TE modes of metal waveguide with integrated graphene structure in the sub-terahertz frequency range


The dispersion equation for waveguide modes of rectangular metal waveguides containing a dielectric buffer/graphene/air gap layered structure has been derived within the approximation of perfectly conducting metal waveguide walls. Dispersion dependences of TE0m modes for sub-terahertz frequencies were analysed against buffer layer thickness and Fermi energy level of graphene electrons. For the first time, it is demonstrated that the waveguide modes can be substantially modulated by tuning the electron Fermi energy level in graphene, particularly close to the regions of robust waveguide mode modifications. This enables the potential for future designs of amplitude and part modulators for sub-THz waves in metal waveguides crammed with an integrated graphene structure.

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