Optical beam splitting and asymmetric transmission in bi-layer metagratings

Shi, Qiangshi; Xia, Jin; Fu, Yangyang; Wu, Qiannan; Huang, Cheng; Sun, Baoyin; Gao, Lei; Xu, Yadong

doi:10.3788/col202119.042602

Cited by 7 publications

(5 citation statements)

References 4 publications

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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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Section: Metagratings For Various Applicationsmentioning

confidence: 99%

Metagratings for Efficient Wavefront Manipulation

Ra’di

Alù

2022

IEEE Photonics J.

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“…metasurfaces, representing a revolutionary shift in device design, have become increasingly prevalent for generating diverse and innovative devices, ranging from optical to microwave applications. These devices include those for abnormal reflection [1][2][3], meta-lenses [4][5][6][7][8], holograms [9][10][11][12][13], specialized beam manipulation [14][15][16][17][18][19], and quantum manipulation [20][21][22][23][24]. Unlike natural materials or traditional three-dimensional meta-materials, metasurfaces are artificially engineered electromagnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Cai,

Li,

et al. 2024

Preprint

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The integration of multiple functionalities into a single, planar, ultra-compact metasurface has presented significant opportunities for enhancing capacity and performance within compact 5G/6G communication systems. Recent advances in multifunctional metasurfaces have unveiled comprehensive wavefront manipulations utilizing phase, polarization transmission/reflection, and coding apertures. Despite these developments, there remains a critical need for multifunctional metasurfaces with expanded channel capabilities, including multiple operational frequencies, minimal crosstalk, and high-efficiency computable array factors. This study introduces a multifunctional metasurface that integrates phase- and amplitude simultaneous coding meta-atoms at dual frequencies. By altering the polarization of electromagnetic (EM) waves, it is possible to reshape the wave-fronts of reflected waves at these frequencies. The coding metasurface proficiently manipulates both x and y linearly polarized waves through phase and amplitude coding at dual frequencies, thereby enabling distinct functionalities such as anomalous reflection, reflection imaging, and vortex wave beam generation. Both theoretical analysis and full-wave simulation confirm the anticipated functionalities of the designed devices, paving the way for advancements in integrated communication systems with diverse functionalities.

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“…Recent years have witnessed progress in the development of phase-gradient metasurfaces [24][25][26][27][28] that provide unprecedented opportunities for wave front manipulation, producing unusual refractive and reflection phenomena based on the generalized Snell's law (GSL) [29]. In particular, recently subwavelength metal slit arrays with phase gradient modulation, referred to as metagratings (MGs) [30][31][32][33], have been used to effectively manipulate electromagnetic waves or light, relying on the parity-dependent diffraction law [33] that can be used to predict results beyond the GSL.…”

Section: Introductionmentioning

confidence: 99%

Broadband optical negative refraction based on dielectric phase gradient metagratings

Wu¹,

Chen²,

Cao³

et al. 2021

J. Phys. D: Appl. Phys.

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In this work, we design and study a dielectric phase-gradient metagrating (DPGM) with SiGe whose operating frequency is in the visible band. It is found that this DPGM can enable negative refraction for incident light over a wide incident angle, and due to the tolerances in the metasurface design, this negative refraction has a broadband response from 400 nm to 470 nm. The underlying mechanism is due to the m-dependent diffraction law. An angularly asymmetric transmission phenomenon is observed in the designed DPGM, and the physical mechanism behind the phenomenon is revealed. Our results pave the way to achieving negative refraction in visible frequencies.

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Optical beam splitting and asymmetric transmission in bi-layer metagratings

Cited by 7 publications

References 4 publications

Metagratings for Efficient Wavefront Manipulation

Metagratings for Efficient Wavefront Manipulation

Phase and Amplitude Simultaneously Coding Metasurface with Multi-frequency and Multifunctional Electromagnetic Modulations

Broadband optical negative refraction based on dielectric phase gradient metagratings

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