Susceptibility Derivation and Experimental Demonstration of Refracting Metasurfaces without Spurious Diffraction

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Research units


Refraction represents one of the most fundamental operations that may be performed by a metasurface. However, simple phasegradient metasurface designs suffer from restricted angular deflection due to spurious diffraction orders. It has been recently shown, using a circuit-based approach, that refraction without spurious diffraction, or diffraction-free, can fortunately be achieved by a transverse (or inplane polarizable) metasurface exhibiting either loss-gain, nonreciprocity or bianisotropy. Here, we rederive these conditions using a mediumbased – and hence more insightfull – approach based on Generalized Sheet Transition Conditions (GSTCs) and surface susceptibility tensors, and experimentally demonstrate, for the first time beyond any doubt, two diffraction-free refractive metasurfaces that are essentially lossless, passive, bianisotropic and reciprocal.


Original languageEnglish
Pages (from-to)1321 - 1330
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - 15 Jan 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Absorption, Antennas, Complexity theory, Diffraction, Electromagnetics, Scattering parameters, Tensile stress

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