Metagratings: Beyond the Limits of Graded Metasurfaces for Wave Front Control

Ra’di, Younes; Sounas, Dimitrios L.; Alù, Andrea

doi:10.1103/physrevlett.119.067404

Cited by 437 publications

(369 citation statements)

References 40 publications

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“…Recently the concept of meta-grating was proposed, based on which, it was shown that a periodic array of individual bianisotropic particles enables asymmetric scattering of a normally incident wave to a desired direction [34]. In addition to unitary efficiency, this concept eliminates the need for gradient impedance profiles that require high-resolution discretization of metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Efficient anomalous reflection through near-field interactions in metasurfaces

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Efficient anomalous reflection through near-field interactions in metasurfaces

et al. 2017

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“…As subwavelength‐pixel diffractive optical elements, metasurfaces could tailor the phase and amplitude of the reflected and transmitted light by tuning the geometry of structures . Not only do metadevices such as meta‐holograms, meta‐lenses, and metagratings realize the functionalities of their traditional counterparts, they also possess some unprecedented properties such as polarization sensitivity and nonlinear effects . High‐efficiency manipulation of light is the cornerstone of many potential applications of metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Metasurfaces of ≈80% Efficiency with Antiferromagnetic Resonances for Optical Vectorial Anti‐Counterfeiting

Huang

Deng

Leong

et al. 2019

Laser & Photonics Reviews

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Metasurfaces enable the full control of electromagnetic waves over a wide spectrum. High‐efficiency transmissive metasurfaces have been demonstrated up to the visible frequencies by using dielectrics. However, extending the operating spectrum to the ultraviolet range is challenging. This is due to the strong absorption in typical dielectric materials and the inexhaustive understanding of the magnetic resonances in dielectric nanostructures. Here, a large‐bandgap material—niobium pentoxide (Nb2O5)—is introduced to engineer the ultraviolet geometric meta‐holograms to achieve a total efficiency of 79.6% at 355 nm wavelength. The employed orientation‐varying nanobricks, operating as miniaturized half‐waveplates (HWPs), are elaborately designed to excite the antiferromagnetic modes that maintain Ex component of the incident light via even antiparallel magnetic dipoles (AMDs) but reverse Ey component via odd AMDs, thereby unveiling the underlying mechanism of dielectric nano‐HWPs. By adding the polarization degree of freedom, an ultra‐channel meta‐hologram, multiplexing two orthogonal spin channels while exhibiting three outputs, is demonstrated experimentally for ultraviolet vectorial anti‐counterfeiting. This work might open the door toward high‐performance ultraviolet nanophotonics and meta‐optics.

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“…[47][48][49] Assuming the metawall is illuminated with obliquely incident TE waves propagating in the z-x plane, the electric field of direct reflected wave from the ground plane is expressed as exp r 0 00 00 [47][48][49] Assuming the metawall is illuminated with obliquely incident TE waves propagating in the z-x plane, the electric field of direct reflected wave from the ground plane is expressed as exp r 0 00 00…”

mentioning

confidence: 99%

“…[37,48,49] The radiated fields in terms of TM plane waves can be expressed as [37,48,49] The radiated fields in terms of TM plane waves can be expressed as …”

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confidence: 99%

Origami Metawall: Mechanically Controlled Absorption and Deflection of Light

Shen

Jing

et al. 2019

Advanced Science

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Metamaterials/metasurfaces, which have subwavelength resonating unit cells (i.e., meta‐atoms), can enable unprecedented control over the flow of light. Despite their significant progress, achieving dynamical control of both energy and momentum of light remains a challenge. Here, a mechanically tunable metawall capable of either absorbing light energy or modulating light momentum, by incorporating the magnetic meta‐atoms into a 3D printed origami grating, is theoretically designed and experimentally realized. Through mechanical stretching or compressing of the Miura‐ori pattern, the function of metawall can transit from an absorber, a mirror, to a negative reflector. Particularly, the continuously geometric deformation of the Miura‐ori lattice is a promising approach to compensate the angular dispersion in gradient metasurfaces. Considering the prominent mechanical properties and strong deformation abilities of origami structures, the findings may open an alternative avenue toward lightweight and deployable metadevices with diversified and continuously alterable electromagnetic properties.

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Metagratings: Beyond the Limits of Graded Metasurfaces for Wave Front Control

Cited by 437 publications

References 40 publications

Efficient anomalous reflection through near-field interactions in metasurfaces

Efficient anomalous reflection through near-field interactions in metasurfaces

Ultraviolet Metasurfaces of ≈80% Efficiency with Antiferromagnetic Resonances for Optical Vectorial Anti‐Counterfeiting

Origami Metawall: Mechanically Controlled Absorption and Deflection of Light

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