Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance

Deng, Zi‐Lan; Ye, Xuan; Qiu, Hao-Yang; Tu, Qing-An; Shi, Tan; Zhuang, Ze-Peng; Guan, Bai‐Ou; Feng, Naixing; Wang, Guo Ping; Kapitanova, Polina; Alù, Andrea; Dong, Jian‐Wen; Li, Xiangping

doi:10.1039/d0nr05745b

Cited by 23 publications

(20 citation statements)

References 57 publications

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“…[26][27][28] Currently, both BICs and EPs in metasurfaces have been mostly focused on the manipulation of the spectral/temporal properties of the impinging optical signals, namely, to control the zeroth diffraction-order transmission/reflection features for incident plane waves. [10][11][12][13][23][24][25] In parallel, few-diffraction-order (FDO) metagratings, capable of suppressing undesired diffraction orders and redirecting the incident power to preferred directions with unitary efficiency, have been developed for efficient and extreme wavefront engineering with less spatial resolution demand [29][30][31][32][33][34][35][36][37][38][39][40] when compared with conventional phase-gradient metasurfaces. [41,42] In this paper, we introduce a platform to control the emergence of BICs and EPs near the Brillouin edge of an FDO metagrating, tailoring the diffraction spectra in extreme ways.…”

Section: Introductionmentioning

confidence: 99%

“…In parallel, few‐diffraction‐order (FDO) metagratings, capable of suppressing undesired diffraction orders and redirecting the incident power to preferred directions with unitary efficiency, have been developed for efficient and extreme wavefront engineering with less spatial resolution demand [ 29–40 ] when compared with conventional phase‐gradient metasurfaces. [ 41,42 ] In this paper, we introduce a platform to control the emergence of BICs and EPs near the Brillouin edge of an FDO metagrating, tailoring the diffraction spectra in extreme ways.…”

Section: Introductionmentioning

confidence: 99%

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Extreme Diffraction Control in Metagratings Leveraging Bound States in the Continuum and Exceptional Points

Deng

et al. 2022

Laser & Photonics Reviews

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Coupled resonances in non‐Hermitian systems can lead to exotic optical features, such as bound states in the continuum (BICs) and exceptional points (EPs), which have been recently emerged as powerful tools to control the propagation and scattering of light. Yet, similar tools to control diffraction and engineer spatial wavefronts have remained elusive. Here, it is shown that, by operating a metagrating around BICs and EPs, it is possible to achieve an extreme degree of control over coupling to different diffraction orders. Subwavelength metallic slit arrays stacked on a metal‐insulator‐metal waveguide, enabling a careful control of the coupling between localized and guided modes are explored. By tuning the coupling strength from weak to strong, the overall spectral response can be tailored and the emergence of singular features, like BICs and EPs can be enabled. Perfect unitary diffraction efficiency with large spectrum selectivity is achieved around these singular features, with promising applications for selective wavefront shaping, filtering, and sensing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extreme Diffraction Control in Metagratings Leveraging Bound States in the Continuum and Exceptional Points

Deng

et al. 2022

Laser & Photonics Reviews

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“…However, just to give the readers a flavor of the broad scope of research areas that have employed this concept, here we list a few of the main applications that have been introduced in the past few years. Metagratings have been employed for lensing [52], [65], [85]- [87], holograms [88], [89], generation of vortex beams [90], [91], sensors [92], [93], high-Q resonators [94], ultra-narrowband absorbers [95], [96], power splitters [97]- [99], spectrum splitters [100], optical computing [101], [102], engineering reactive near field profiles [103], waveguiding for mode conversion and elimination of reflections at the bends [104], [105], light emitting devices [106], metrology [107], photovoltaics [108], retroreflectors [109], space-to-surface wave converting surfaces [110], and waterborne acoustics [79].…”

Section: Metagratings For Various Applicationsmentioning

confidence: 99%

Metagratings for Efficient Wavefront Manipulation

Ra’di

Alù

2022

IEEE Photonics J.

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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.

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“…Gradient metasurface has presented as a new technique to overcome the limitation of wavefront controlling and is a periodical artificial material of planar meta‐atoms array in such of a single or more subwavelength 1 . The structure of metasurfaces is a class of artificial materials engineered different shapes thin layers located in or on a dielectric to provide electromagnetic propagation as reflected arrays or transmitted arrays towards the desired directions, 2,3 the visible or the infrared to achieve various optical functions, 4,5 artificial magnetic conductor (AMC) reflectors using perfect electric conductor (PEC) for achieving wideband performances, 6,7 and also as radio frequency (RF) energy harvesting for obtaining ultrawideband applications 8–11 …”

Section: Introductionmentioning

confidence: 99%

A new leaky wave antenna using wire‐loaded metagratings: The theoretical analysis and implementation

Soad

Sun²,

et al. 2022

Int J Communication

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Summary A new leaky wave antenna (LWA) based on wire‐loaded metagratings (MGs) is proposed, with the capability of successfully employing MGs for leaky modes. Periodic capacitive‐wired and inductive‐wired MGs are located on a dielectric substrate in the LWA framework and backed by a perfect electric conductor (PEC) layer. These MGs are partial radial surfaces to radiate energy using equivalent surface impedance with a local value of the complex wavenumber. A theoretical analysis has created a model for the equivalent electromagnetic fields produced via loaded‐wire MGs and generated the Z‐matrix and S‐matrix for a two‐port structure from the electromagnetic fields. As a result, a beam‐scanning range of 53° for the operating bandwidth of 9.9–11.9 GHz is achieved with a scanning sensitivity of 26.5°/GHz. Meanwhile, the realized gain is obtained up to 12.9 dB. The measurement and simulation results indicated that the MGs LWA was consistent. The proposed antenna performed admirably in beam‐steering communication systems.

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Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance

Abstract: Metagratings have been shown to form an agile and efficient platform for extreme wavefront manipulation, going beyond the limitations of gradient metasurfaces. Here, we theoretically show perfect unitary diffraction in...

Cited by 23 publications

References 57 publications

Extreme Diffraction Control in Metagratings Leveraging Bound States in the Continuum and Exceptional Points

Extreme Diffraction Control in Metagratings Leveraging Bound States in the Continuum and Exceptional Points

Metagratings for Efficient Wavefront Manipulation

A new leaky wave antenna using wire‐loaded metagratings: The theoretical analysis and implementation

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