2019
DOI: 10.1038/s41467-019-10377-9
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Reversal of transmission and reflection based on acoustic metagratings with integer parity design

Abstract: Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction wi… Show more

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Cited by 174 publications
(118 citation statements)
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“…In this condition, the lattice vector of the periodic structure replaces the phase gradient; this reveals various interesting phenomena, such as high order diffraction, asymmetric transmission and retroreflection. [35][36][37][38] However, while the inherited physics has been theoretically revealed in past studies, devices utilizing the relevant content is still rare. 39,40 Because the current research framework of metasurfaces which modulate full space lacks polarization response, the combination of the phase gradient for asymmetric transmission and a conventional polarization multiplexing scheme may pave the way to achieve novel polarization-selective full-space control in the electromagnetic regime.…”
Section: Introductionmentioning
confidence: 99%
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“…In this condition, the lattice vector of the periodic structure replaces the phase gradient; this reveals various interesting phenomena, such as high order diffraction, asymmetric transmission and retroreflection. [35][36][37][38] However, while the inherited physics has been theoretically revealed in past studies, devices utilizing the relevant content is still rare. 39,40 Because the current research framework of metasurfaces which modulate full space lacks polarization response, the combination of the phase gradient for asymmetric transmission and a conventional polarization multiplexing scheme may pave the way to achieve novel polarization-selective full-space control in the electromagnetic regime.…”
Section: Introductionmentioning
confidence: 99%
“…39,40 Because the current research framework of metasurfaces which modulate full space lacks polarization response, the combination of the phase gradient for asymmetric transmission and a conventional polarization multiplexing scheme may pave the way to achieve novel polarization-selective full-space control in the electromagnetic regime. 14,15,35 In this article, a metasurface platform is proposed which achieves asymmetric transmission according to the polarization states of incident light and conveys two independent phase profiles to each space at the same time. We utilize a birefringent nanopillar as a unit to impart different phase profiles at two arbitrary orthogonal polarizations.…”
Section: Introductionmentioning
confidence: 99%
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“…Fermat's principle [8] points out that the wavefront of a light beam can be modified by controlling the phase of the light wave [9,10]. A metasurface exhibits peculiar optical properties in controlling electromagnetic waves [11,12]; it is also widely used in the terahertz band [13]. Traditional metal-based metasurfaces can effectively reduce losses during electromagnetic wave propagation [14,15], but the interaction intensity decreases as the distance between the metasurface and the electromagnetic beam increases [16,17].…”
Section: Introductionmentioning
confidence: 99%
“…geometries 47 to achieve control even at oblique incidence, including using only two types of unit cells 48 and Archimedean spiral structures 49 . To the author's best knowledge, however, Melde et al 20 were the only ones to use a reflecting metamaterial for acoustic levitation, managing to suspend two lines of water droplets, with vertical distances of λ/2 between the droplets in each line and a horizontal distance of 2λ between the lines.…”
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confidence: 99%