Electrically and Magnetically Biased Graphene-Based Cylindrical Waveguides: Analysis and Applications as Reconfigurable Antennas

  • Diego Correas-Serrano /
  • Juan Sebastian Gomez-Diaz /
  • Andrea Alu /
  • Alejandro Alvarez-Melcon
Journal ar
IEEE Transactions on Terahertz Science and Technology
  • Volumen: 5
  • Número: 6
  • Fecha: 01 November 2015
  • Páginas: 951-960
  • ISSN: 2156342X
  • Source Type: Journal
  • DOI: 10.1109/TTHZ.2015.2472985
  • Document Type: Article
  • Publisher: IEEE Microwave Theory and Techniques Society
© 2011-2012 IEEE. The propagation of surface waves along electrically and magnetically biased graphene-based cylindrical waveguides (GCWs) is investigated in detail. Analytical dispersion equations are derived for several GCW geometries, considering the presence of an inner metallic core and multiple (coaxial-like) graphene layers. The proposed formulation reveals a fundamental connection between surface plasmons found in GCWs/carbon nanotubes and planar graphene structures. Numerical results confirm the higher confinement of modes supported by GCWs compared with their planar counterparts, while keeping a similar level of losses. The proposed structure is applied to develop plasmonic reconfigurable dipole antennas in the low THz band, which provide higher radiation efficiency than current graphene-based radiators, without requiring the presence of bulky lenses. We envision that the proposed GCWs may find application in reconfigurable THz transceivers, near-field application, wireless interconnects, and sensing systems.

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