An Overview of the Theory and Applications of Metasurfaces: The Two-Dimensional Equivalents of Metamaterials

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Characterizing Metasurfaces/Metafilms: The Connection Between Surface Susceptibilities and Effective Material Properties (2011, background): “The distinction between a metasurface and a frequency selective surface (FSS) is discussed in detail in [2].”
A Coding Diffuse Metasurface for RCS Reduction (2017, background): “The metasurface is a two-dimensional (2-D) equivalence of metamaterials [6], which are usually constituted by inhomogeneous arrays of subwavelength resonators.”
A Metasurfaces Review: Definitions and Applications (2019, background): “It also needs to be mentioned that when the periodicity of these individual scatterers becomes closer in size to the wavelength of operation, higher order propagating Floquet modes need to be taken into account, to accurately describe their behaviour, such structures, therefore are not classified as”
Toward Smart Wireless Communications via Intelligent Reflecting Surfaces: A Contemporary Survey (2019, background): “There are a few review papers in the literature, either focusing on the physical design and implementations of the reconﬁgurable metasurface, e.g., [31]–[33], or its conceptual applications in wireless communications and networking, e.g., [10], [12], [13].”
Total Absorption of Electromagnetic Waves in Ultimately Thin Layers (2012, background): “Such artificial sheets with engineered electromagnetic properties are called “metasurfaces” or “metasheets”, see recent reviews [10], [11].”