Wave-front Transformation with Gradient Metasurfaces

By N. Estakhri, Andrea Alù. 2016

372 citations recorded by the source corpus.

Metasurfaces are engineered systems that enable advanced control of electromagnetic waves over deeply subwavelength thicknesses. Researchers make a careful study of the use of metasurfaces to transform the impinging optical wave front.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/aa2213a9f39736f80ccc54b9096e414682afa082

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In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Reconfigurable Intelligent Surfaces: Principles and Opportunities (2020, background): “Moreover, [33] states that, according to their simulation results, one can expect increasingly improved performance for RIS designed based on wave-optics in comparison to those designed based on the ray-optics approximation.”
Intelligent Reflecting Surfaces: Physics, Propagation, and Pathloss Modeling (2019, background): “ local phase shift can be approximated. For example, in [13], the phase distribution is discretized/quantized with a step size of =5, to represent the ﬁnite number of resonators used in practice. In [14], the surface is discretized by =8 as also shown in Fig. 4. The size of each element greatly depe”
STAR-RISs: Simultaneous Transmitting and Reflecting Reconfigurable Intelligent Surfaces (2021, background): “1, the reconfigurability of the element is reflected in the change of the surface impedances, since the transmission and reflection coefficients of the mth element is related to the surface impedances as: Tm = 2−η0Ym 2+η0Ym − Rm, and Rm = − 2(η 2 0 Ym−Zm) (2+η(2) 0 Ym)(2η0+Zm) , where η0 is the impe”
Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How It Works, State of Research, and The Road Ahead (2020, background): “Therefore, the reflection coefficient is more conveniently defined as a parameter that quantifies the mismatch between the surface-averaged impedances of anomalous reflection and specular reflection [36], [37].”
Susceptibility Derivation and Experimental Demonstration of Refracting Metasurfaces Without Spurious Diffraction (2018, background): “Such operations have been achieved in blazed gratings [12], [13], and later in planar phase-gradient metasurfaces [11], however, with restriction to small angle differences between the incident and refracted or reflected beams and in the presence of spurious diffraction orders [8], [14].”
High-efficiency and full-space manipulation of electromagnetic wave-fronts with metasurfaces (2017, background): “Recently, metamaterials (artificial materials made by subwavelength microstructures with tailored EM properties) and particularly their planar version, metasurfaces, have demonstrated strong capabilities to manipulate EM waves, generating many fascinating effects such as anomalous refraction/reflect”
Physics-Based Modeling and Scalable Optimization of Large Intelligent Reflecting Surfaces (2020, background): “cells on one tile acts as a continuous programmable surface [33], [34], cf.”
Perfect Anomalous Reflection with a Bipartite Huygens’ Metasurface (2017, background): “It shows that this variation very well approximates the theoretical sinusoidal variation (dotted blue curve) of a perfect anomalous reflection metasurface [32,33],”
Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces: How it Works, State of Research, and Road Ahead (2020, background): “Therefore, the reflection coefficient is more conveniently defined as a parameter that quantifies the mismatch between the surface-averaged impedances of anomalous reflection and specular reflection [36], [37].”
Nonlocal flat optics (2022, background): “An important challenge that this body of work has identified is the fact that, even at a single frequency, passive lossless metasurfaces based on the generalized laws of reflection/refraction [4] cannot create arbitrary wavefront transformations with unitary efficiency, particularly in reflection an”