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Dirac leaky-wave antennas for continuous beam scanning from photonic crystals

Author

Listed:
  • Mohammad Memarian

    (University of Toronto)

  • George V. Eleftheriades

    (University of Toronto)

Abstract

Leaky-Wave Antennas (LWAs) enable directive and scannable radiation patterns, which are highly desirable attributes at terahertz, infrared and optical frequencies. However, a LWA is generally incapable of continuous beam scanning through broadside, due to an open stopband in its dispersion characteristic. This issue is yet to be addressed at frequencies beyond microwaves, mainly as existing microwave solutions (for example, transmission line metamaterials) are unavailable at these higher frequencies. Here we report leaky-wave radiation from the interface of a photonic crystal (PC) with a Dirac-type dispersion and air. The resulting Dirac LWA (DLWA) can radiate at broadside, chiefly owing to the closed Γ-point bandgap of the Dirac PC. Thus, the DLWA can continuously scan a directive beam over a wide range of angles by varying the frequency. These DLWAs can be designed at microwave as well as terahertz to optical frequencies, with feasible dimensions and low losses.

Suggested Citation

  • Mohammad Memarian & George V. Eleftheriades, 2015. "Dirac leaky-wave antennas for continuous beam scanning from photonic crystals," Nature Communications, Nature, vol. 6(1), pages 1-9, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms6855
    DOI: 10.1038/ncomms6855
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    Cited by:

    1. Hao Li & Ziheng Zhou & Wangyu Sun & Michaël Lobet & Nader Engheta & Iñigo Liberal & Yue Li, 2022. "Direct observation of ideal electromagnetic fluids," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Ayman H. Dorrah & George V. Eleftheriades, 2021. "Experimental demonstration of peripherally-excited antenna arrays," Nature Communications, Nature, vol. 12(1), pages 1-14, December.

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