Broadband, High‐Efficiency and Wide‐Incident‐Angle Anomalous Reflection in Groove Metagratings

Liu, Chuanbao; He, Jingjin; Zhou, Ji; Xu, Jianchun; Bi, Ke; Chen, Junhong; Li, Qiao; Bai, Yang

doi:10.1002/andp.202100149

Cited by 8 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the line current model, MGs based on traditional grating theory can also allow achieving energy distribution for two anomalous split beams. − Similarly, it demands complex calculations and a genetic optimization algorithm. The groove-form unit cell also presents limitations in the polarization mode . In ref , dual-polarized MGs are realized through a mode matching the semi-analytical scheme.…”

Section: Introductionmentioning

confidence: 76%

Perfect Control of Diffraction Patterns with Phase-Gradient Metasurfaces

Wang

Yuan

Yang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Phase-gradient metasurfaces (PGMs) constitute an efficient platform for deflection of a beam in a desired direction. According to the generalized Snell's law, the direction of the reflected/refracted wave can be tuned by the spatial phase function provided by the PGMs. However, most studies on PGM focus only on a single diffraction order, that is, the incident wave can be reflected or refracted to a single target direction. Even in the case of multiple beams pointing in different directions, the beams are still in the same order mode, and the energy carried by different beams cannot be controlled. In addition, the energy ratio of multiple beams is generally uncontrollable. Here, we propose a general method to perfectly control diffraction patterns based on a multi-beam PGM. An analytical solution for arbitrarily controlling diffraction beams is derived through which the generation and energy distribution in high-order diffraction beams can be achieved. Three metasurfaces with different diffraction orders and energy ratios are designed and fabricated to demonstrate the proposed method. The efficiencies of diffraction for the desired channels are close to 100%. The simulated and measured far-field patterns are in good agreement with theoretical predictions, validating the proposed method that provides a new way to design multi-beam antennas and that has significance in wireless communication applications.

show abstract

Section: Introductionmentioning

confidence: 76%

Perfect Control of Diffraction Patterns with Phase-Gradient Metasurfaces

Wang

Yuan

Yang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The dependence of −1st-order diffraction efficiency on wave vectors is shown in figures 2(a) and (b) shows the details of the region of interest in (a). The white dotted line in figure 2 is the Rayleigh anomalies (RAs) [23,41] for diffraction orders, which can be calculated by the grating equation…”

Section: Simulation and Resultsmentioning

confidence: 99%

High-efficiency broadband blazed metagrating working in visible light

Lin¹,

Han²,

Wang³

et al. 2022

J. Opt.

View full text Add to dashboard Cite

A simple 1D blazed metagrating is proposed. The metagrating consists of SiO2 film sandwiched by Ag substrate and Ag nanostrips, which can achieve high-efficiency -1st-order diffraction in the range of 550 nm to 700 nm, and the peak efficiency is nearly 98%. The SiO2 dielectric layer in previous designs is used chiefly as a waveguide layer to support a guided mode. In comparison, it is introduced here to suppress the unwanted diffraction order (zero-order), which helps achieve high-efficiency diffraction at a high diffraction order. For analysis, the metagrating is disassembled into two parts, including a flat plate and a grating. By analyzing the far-field radiation pattern of scattered waves and the reflection phase of a specific mode for these two parts, we conclude that the cause of high-efficiency blazing draws support from suppressing zero-order based on destructive interference. This work provides an intuitive physical image for this type of metagrating and an idea to design high-efficiency diffraction and beam deflection devices from the perspective of interference.

show abstract

“…Inampudi et al [72] recently demonstrated that the network architecture can enable a fast-paced inverse design of metagrating devices for a desired set of functionalities. A similar approach was recently employed by Liu et al to realize multifunctional metagratings [62] [see Fig. 10(b)].…”

Section: Metagratings Designed Based On Different Optimization Methodsmentioning

confidence: 99%

“…In recent years, there have been several studies proposing different designs for broadband metagratings [39], [61], [62]. There are two important issues that need to be considered when we talk about broadband metagratings.…”

Section: Broadband Multiband and Dual-polarized Metagratingsmentioning

confidence: 99%

Metagratings for Efficient Wavefront Manipulation

Ra’di

Alù

2022

IEEE Photonics J.

View full text Add to dashboard Cite

Recently, it was revealed that conventional gradient metasurfaces are fundamentally limited on their overall efficiency to reroute the impinging waves towards arbitrary directions in reflection and transmission. Their efficiency is particularly limited for extreme wavefront transformations. In addition, due to the fastly varying impedance profiles that these surfaces require, they usually need high-resolution fabrication processes, limiting their applicability and overall bandwidth of operation. To address these issues, the concept of metagrating was recently introduced, enabling engineered surfaces capable of manipulating light with unitary efficiency even in the limit of extreme wavefront manipulation. Metagratings are periodic or locally periodic arrays operated in the few-diffraction order regime. Their unit cell contains carefully designed scatterers that, in contrast with conventional metasurfaces, do not need to support a continuous gradient of surface impedance, and consequently are far simpler to fabricate and can afford broader bandwidths because of the larger footprint of the constituent elements. Tailoring the coupling towards the few available diffraction channels, metagratings enable wavefront transformations with high efficiency. In this paper, we review the physical mechanisms behind the functionality of metagratings and provide an overview and outlook of the recent progress in this field of science and technology.

show abstract

Broadband, High‐Efficiency and Wide‐Incident‐Angle Anomalous Reflection in Groove Metagratings

Cited by 8 publications

References 32 publications

Perfect Control of Diffraction Patterns with Phase-Gradient Metasurfaces

Perfect Control of Diffraction Patterns with Phase-Gradient Metasurfaces

High-efficiency broadband blazed metagrating working in visible light

Metagratings for Efficient Wavefront Manipulation

Contact Info

Product

Resources

About