Nonreciprocal Graphene-Based Leaky-Wave Antennas: Theory and Applications

D. Correas-Serrano, Juan Sebastian Gomez Diaz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Leaky-wave antennas (LWAs) have received considerable attention in recent decades thanks to their exciting radiation and beam-scanning properties [1]. These structures are based on the energy that is gradually radiated to free-space by an electromagnetic wave that propagates trough a waveguide with a phase velocity larger than the speed of light. Even though the fundamentals of leaky-waves were unveiled by electrical engineers during the second half of last century [1], their application to other fields such as optics and physics has allowed to understand and correctly interpret many intriguing phenomena across the electromagnetic spectrum, including extraordinary transmission, electromagnetic induced transparency, Wood's anomaly, or Cherenkov radiation. In addition, leaky-wave antennas with exciting properties, including the ability to independently control their complex propagation constant, reconfigurability, or even non-reciprocity, have recently been put forward at microwaves, millimeter-waves, and optics. At terahertz, a frequency region that lies in the technological gap between the well-developed areas of photonics and electronics, the potential of leaky-waves has not yet been fully exploited due to immature state of technology and relatively large amount of losses that materials exhibit in this band. In a related context, graphene has recently led to a revolution in material science thanks to its outstanding thermal, electrical, and mechanical properties. In particular, this two-dimensional material supports the propagation of surface plasmon polaritons (SPPs) at terahertz and infrared frequencies that exhibit moderate loss, strong wave localization, and the exceptional property of being tunable by applying a modest DC bias. Such properties have recently been applied to realize a wide variety of plasmonic antennas, including resonant dipoles and reflectarrays, at terahertz. In addition to inherent reconfigurability, graphene antennas show high radiation efficiency thanks to their large intrinsic wave impedance that permits to easily match photomixers-one of the most common terahertz sources-with high input impedances (10 k Ω). On the contrary, common metallic antennas at terahertz, despite exhibiting lower loss, have a small input impedance (in the range of 100 s Ω) that prevents the efficient coupling of terahertz waves and their subsequent radiation.

Original languageEnglish (US)
Title of host publication2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9789082598735
DOIs
StatePublished - Sep 24 2018
Event2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018 - Gran Canaria, Spain
Duration: May 28 2018Jun 1 2018

Other

Other2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018
CountrySpain
CityGran Canaria
Period5/28/186/1/18

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Electrical and Electronic Engineering
  • Instrumentation

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    Correas-Serrano, D., & Gomez Diaz, J. S. (2018). Nonreciprocal Graphene-Based Leaky-Wave Antennas: Theory and Applications. In 2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018 [8471646] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.23919/URSI-AT-RASC.2018.8471646