MOLDING WAVEFRONTS WITH METASURFACES
The objective of this research is to develop engineered surfaces that can manipulate electromagnetic wavefronts at will.
Huygens’ metasurfaces (HMS) are inspired by the Huygens’ principle which describes wave effects such as refraction and reflection in terms of the interference from waves emanating from secondary sources on a surface. In this sense, suitably weighted electric and magnetic surface currents are used to mold the flow and shape of electromagnetic wavefronts. These surfaces comprise sub-wavelength unit cells such that they can be homogenized using for example equivalent sheet impedances and/or admittances.
These advanced surfaces are developed for applications ranging from 5G/6G and satellite communications, radar sensors, smart buildings (transparent metasurfaces), imaging/therapy.
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References
[1] M. Selvanayagam and G. V. Eleftheriades, “Discontinuous electromagnetic fields using orthogonal
electric and magnetic currents for wavefront manipulation,” Opt. Express, vol. 3727, no. 12, p. 3720–3727, 2013.
[2] J. P. S. Wong, A. Epstein, and G. V. Eleftheriades, “Reflectionless wide-angle refracting metasurfaces,”
IEEE Antennas Wireless Propag. Lett., vol. 15, pp. 1293–1296, 2015.
[3] A. Epstein, J. Wong and G.V. Eleftheriades, “Cavity-excited Huygens' metasurface antennas for near-unity aperture illumination efficiency from arbitrarily-large apertures", Nature Comm., vol. 7, p. 10360, Jan. 2016.
[4] A. Epstein and G.V. Eleftheriades, “Arbitrary antenna arrays without feed networks based on cavity-excited omega-bianisotropic metasurfaces", IEEE Trans. on Antennas and Propagation, vol. 65, pp. 1749-1756, issue 4, 2017.
[5] M. Chen and G.V. Eleftheriades, “Omega-bianisotropic wire-loop Huygens’ metasurface for reflectionless wide-angle refraction,” IEEE Trans. on Antennas and Propagat., vol. 48, pp. 1477-1490, March 2020.