Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 5, Issue 6, Pages 951-960Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2015.2472985
Keywords
Graphene; plasmonics; reconfigurable antennas; terahertz (THz)
Funding
- Spanish CICYT [TEC2013-47037-C5-5-R]
- European Feder Fundings
- National Science Foundation [ECCS-1406235]
- Air Force Office of Scientific Research [FA9550-14-1-0105]
- Spanish MECD [FPU13-04982]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1406235] Funding Source: National Science Foundation
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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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