Perfect non-specular reflection with polarization control by using a locally passive metasurface sheet on a grounded dielectric slab

Yepes, Cristina; Faenzi, Marco; Maci, S.; Martini, Enrica

doi:10.1063/5.0048970

Cited by 18 publications

(13 citation statements)

References 27 publications

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“…Start from a certain topology (usually a patterned metal sheet on a grounded dielectric substrate) and optimize the evanescent fields so that the effective sheet impedance of the thin patterned metal layer is lossless at every point. This is the approach used in [20] and [30] for scalar metasurfaces and in [31] for tensor metasurfaces. In this approach, the impedance model is used only for a single patterned sheet, not for the whole metasurface structure.…”

Section: Reflectarrays and Metamirrorsmentioning

confidence: 99%

Reflectarrays and metasurface reflectors as diffraction gratings

Liu¹,

Kwon²,

Tretyakov³

2022

Preprint

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Reconfigurable reflectors have a significant potential in future telecommunication systems, and approaches to the design and realization of full and tunable reflection control are now actively studied. Reflectarrays, being the classical approach to realization of scanning reflectors, are based on the phased-array theory (the so-called generalized reflection law) and the physical optics approximation of the reflection response. To overcome the limitations of the reflectarray technology, researchers actively study inhomogeneous metasurfaces, using the theory of diffraction gratings. In order to make these devices tunable and fully realize their potential, it is necessary to unify the two approaches and study reconfigurable reflectors from a unified point of view. Here, we offer a basic tutorial on reflectarrays and reflecting metasufaces, explaining their common fundamental properties that stem from the diffraction theory. This tutorial is suitable for graduate and post-graduate students and hopefully will help to develop more deeper understanding of both phased arrays and diffraction gratings.Recent research has shown that realizations of anomalously reflecting metasurfaces as phasegradient reflectors (reactive impedance boundaries with a linearly-varying phase of the local reflection coefficient) have a fundamentally limited efficiency, which degrades when the desired performance significantly deviates from that of uniform mirrors or retroreflectors [11][12][13][14][15]. This degradation takes place because of excitation of parasitic propagating waves that scatter some part of the incident power into unwanted directions. Actually, similar effects are known also

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Section: Reflectarrays and Metamirrorsmentioning

confidence: 99%

Reflectarrays and metasurface reflectors as diffraction gratings

Liu¹,

Kwon²,

Tretyakov³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Only the TM transmission line case is shown for the sake of simplicity. [10,14] and for PIBC [11]. The two exact solutions are summarized in the following.…”

Section: Solutions For Perfect Anomalous Reflectionmentioning

confidence: 99%

“…The solution for the penetrable admittance providing perfect anomalous reflection has been derived in [11] and it reads…”

Section: Solutions For Perfect Anomalous Reflectionmentioning

confidence: 99%

“…However, in practice, it is convenient to realize the MTS as a finite-thickness structure, that will inevitably exhibit some spatial dispersion. In order to account for this, in [11] a different model was proposed, based on a nondispersive penetrable IBC (PIBC) over a grounded dielectric slab, which represents a more accurate model for MTSs realized in PCB technology (the most common realization in the microwave range) [12]. This model correctly describes the spatial dispersion of the MTS, which is due to the presence of the grounded slab.…”

Section: Introductionmentioning

confidence: 99%

“…This paper investigates the connection between the IIBC solution proposed in [10] and the PIBC one found in [11]. The paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the role of spatial dispersion in boundary conditions for perfect non-specular reflection

et al. 2022

Self Cite

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Exact solutions for perfect anomalous reflection through metasurfaces have been recently developed in terms of both ideal nondispersive impenetrable boundary conditions (BCs) and penetrable BCs on top of a grounded slab. The second model is more accurate for the description of metasurfaces realized in PCB technology. Focusing on this particular class of metasurfaces, this paper investigates the connection between the two solutions, with the aim to clarify the role of spatial dispersion. It is shown that the two solutions can be related through an equivalent transmission network where transmission lines with different wavenumbers are associated to the incident and reflected waves. Finally, numerical analyses are carried out to assess the impact of neglecting spatial dispersion, as it is done in designs based on a linear phase gradient of the local reflection coefficient.

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A Highly Efficient Method for Designing Bisymmetric P‐B Phase Element Patterns of Coding Metasurfaces

Liu

Zhang

Wang

et al. 2023

Adv Materials Technologies

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The conventional trial-and-error method employed in the element pattern design of coding metasurfaces lacks theoretical guidance and requires considerable time and computational resources. To overcome this problem, this paper proposes a highly efficient design method for bisymmetric Pancharatnam-Berry (P-B) phase element patterns. First, the equivalent impedances of the element patterns are derived from the expected reflectance and frequency range using the transmission matrix method. Subsequently, the optimal geometric parameters of the element patterns are obtained using the equivalent circuit model. For the same element pattern, the time consumption is reduced by more than 25 times compared with that required for a single full-wave simulation. The simulation results show that metasurfaces adopting various design element patterns and the same coding sequence exhibit excellent backscattering energy homogenization performance, with a radar-cross-section reduction (RCSR) of less than −10 dB in the 9.47-17.57 GHz band. Two types of metasurfaces are fabricated using a meshed pattern, a sodium-calcium glass and a metallic mesh. The measured RCSR is less than −10 dB for a broadband of 7.74 GHz, and the normalized optical transmittance is 85% within 380-2500 nm, which is favorable for optical windows used in aerospace, medical, and precision instrumentation.

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Perfect non-specular reflection with polarization control by using a locally passive metasurface sheet on a grounded dielectric slab

Cited by 18 publications

References 27 publications

Reflectarrays and metasurface reflectors as diffraction gratings

Reflectarrays and metasurface reflectors as diffraction gratings

On the role of spatial dispersion in boundary conditions for perfect non-specular reflection

A Highly Efficient Method for Designing Bisymmetric P‐B Phase Element Patterns of Coding Metasurfaces

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