Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 61, Issue 7, Pages 3589-3596Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2013.2254443
Keywords
Graphene; plasmonics; spatial dispersion; surface waves
Funding
- Swiss National Science Foundation (SNSF) [133583]
- EU FP7 Marie-Curie IEF grant Marconi [300966]
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We investigate the propagation of surface waves along a spatially dispersive graphene sheet, including substrate effects. The proposed analysis derives the admittances of an equivalent circuit of graphene able to handle spatial dispersion, using a non-local model of graphene conductivity. Similar to frequency-selective surfaces, the analytical admittances depend on the propagation constant of the waves traveling along the sheet. Dispersion relations for the supported TE and TM modes are then obtained by applying a transverse resonance equation. Application of the method demonstrates that spatial dispersion can dramatically affect the propagation of surface plasmons, notably modifying their mode confinement and increasing losses, even at frequencies where intraband transitions are the dominant contribution to graphene conductivity. These results show the need to correctly assess spatial dispersion effects in the development of plasmonic devices at the low THz band.
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