Perfect control of reflection and refraction using spatially dispersive metasurfaces

By Victor Asadchy, M. Albooyeh, S. Tcvetkova, A. Díaz-Rubio, Y. Ra'di, Sergei A. Tretyakov. 2016

468 citations recorded by the source corpus.

Nonuniform metasurfaces (electrically thin composite layers) can be used for shaping refracted and reflected electromagnetic waves. However, known design approaches based on the generalized refraction and reflection laws do not allow realization of perfectly performing devices: there are always some parasitic reflections into undesired directions. In this paper we introduce and discuss a general approach to the synthesis of metasurfaces for full control of transmitted and reflected plane waves and show that perfect performance can be realized. The method is based on the use of an equivalent impedance matrix model which connects the tangential field components at the two sides on the metasurface. With this approach we are able to understand what physical properties of the metasurface are needed in order to perfectly realize the desired response. Furthermore, we determine the required polarizabilities of the metasurface unit cells and discuss suitable cell structures. It appears that only spatially dispersive metasurfaces allow realization of perfect refraction and reflection of incident plane waves into arbitrary directions. In particular, ideal refraction is possible only if the metasurface is bianisotropic (weak spatial dispersion), and ideal reflection without polarization transformation requires spatial dispersion with a specific, strongly nonlocal response to the fields.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/22e67c470627111d07fba8e39686d6cab19c9a5b

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In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

White Paper on Broadband Connectivity in 6G (2020, background): “The IRS concept has its origin in reﬂectarray antennas, which is a class of directive antennas that are ﬂat but can be conﬁgured to act as parabolic reﬂectors or RF lenses [27, 28].”
Broadband Double-Layered Huygens’ Metasurface Lens Antenna for 5G Millimeter-Wave Systems (2020, unknown): “refraction/reflection [20], [21], meta-holograms [22]–[24],”
Nonlocal flat optics (2022, background): “Hence, thanks to the design flexibility afforded by strong nonlocality, which allows optimally utilizing the available energy across the surface, perfect control of anomalous reflection and refraction was demonstrated in metasurfaces that emulate the required nonlocal response via the interference w”
Susceptibility Derivation and Experimental Demonstration of Refracting Metasurfaces Without Spurious Diffraction (2018, methodology): “This synthesis corresponds to the first way of obtaining a diffraction-free refractive metasurface, as shown in [15].”
A review of gap-surface plasmon metasurfaces: fundamentals and applications (2018, background): “One final point ought to be mentioned is that the generalized Snell’s law is not enough for realizing perfectly performing GSPMs because of significant parasitic reflections in undesired directions, especially for large incident angles [54].”
Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How it Works, State of Research, and Road Ahead (2020, background): “Examples of realizations of metasurfaces with perfect control of the reflection and transmission of radio waves can be found in [37], [38], [41], [39].”
Physics-Based Modeling and Scalable Optimization of Large Intelligent Reflecting Surfaces (2020, background): “Here, assuming a unit-cell spacing of d x and d y along the x and y axes, respectively, the total number of unit cells of the IRS is given by λ and L x , L y λ , the collection of all unit cells on one tile act as a continuous programmable surface [28], [29], cf. Fig.”
Transmissive Ultrathin Pancharatnam-Berry Metasurfaces with nearly 100% Efficiency (2017, background): “In general, the metaatoms must exhibit more complex properties (such as bianisotropic response [31] or asymmetric structure [32]) in order to achieve high-efficiency large-angle anomalous refractions.”
Electromagnetic metasurfaces: physics and applications (2019, unknown): “design (say, dropping the gain parts in metasurfaces) does not yield the desired 100% working efficiency [234,236,239,240], which is expected since gain material plays a”
Smart radio environments empowered by reconfigurable AI meta-surfaces: an idea whose time has come (2019, methodology): “For example, methods for the synthesis of meta-surfaces with complete control of the transmitted and reflected waves [80], and efficient computational frameworks to optimize large-area meta-surfaces [81] are available.”