Guiding Waves Along an Infinitesimal Line between Impedance Surfaces

Bisharat, Dia’aaldin J.; Sievenpiper, Daniel F.

doi:10.1103/physrevlett.119.106802

Cited by 81 publications

(88 citation statements)

References 47 publications

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“…Furthermore, the electric and magnetic field distributions over the cross section of the interface waveguide, which are plotted in Figure d, show that the edge mode is concentrated along the line intersection of the thin metasurface films and decays rapidly into the surrounding bulk/surfaces. Uniquely, this characterizes the edge states as 1D line waves in contrast to the typical 2D surface edge states in previously reported PTIs.…”

Section: Resultsmentioning

confidence: 58%

“…Nonetheless, it may be feasible to counterbalance this unequal EM response in natural materials if we consider a combination of two media, which act separately on the EM modes in a dual manner, that is, exhibit equal but opposite effects on the EM fields. Specifically, we employ a patch‐type and an aperture‐type metallic metasurfaces, as shown in Figure , which have complementary capacitive and inductive responses, hence support low‐order TE and TM propagating surface modes, respectively, with identical wavenumbers q TE = q TM = | q | . The thin complementary structures are constructed according to Babinet's principle simply by interchanging the holes and the metal .…”

Section: Resultsmentioning

confidence: 99%

“…Importantly, unlike the majority of existing PTIs, including those with finite thickness, the topological phases here arise due to engineering surface waves rather than bulk waves. Consequently, the ensued topological edge modes, which occur at the boundary of such system, are confined along a 1D line rather than a 2D surface interface, despite the lack of enclosing structures. In addition, we present a proof‐of‐concept in the microwave regime and experimentally show backscattering‐immune propagation of the gapless edge modes around sharp corners by direct imaging of the near field.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic‐Dual Metasurfaces for Topological States along a 1D Interface

Bisharat

Sievenpiper

2019

Laser & Photonics Reviews

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The discovery of topological insulators was rapidly followed by the advent of their photonic analogues, motivated by the prospect of backscattering‐immune light propagation. So far, however, implementations have mainly relied on engineering bulk modes in photonic crystals and waveguide arrays in two‐dimensional (2D) systems, which closely mimic their electronic counterparts. In addition, metamaterials‐based implementations subject to electromagnetic duality and bianisotropy conditions suffer from intricate designs and narrow operating bandwidths. Here, it is shown that symmetry‐protected topological states akin to the quantum spin‐Hall effect can be realized in a straightforward manner by coupling surface modes over metasurfaces of complementary electromagnetic responses. Specifically, stacking unit cells of such metasurfaces directly results in double Dirac cones of degenerate transverse‐electric (TE) and transverse‐magnetic (TM) modes, which break into a wide nontrivial bandgap at small interlayer separation. Consequently, the ultrathin structure supports robust gapless edge states, which are confined along a one‐dimensional (1D) line rather than a surface interface, as demonstrated at microwave frequencies by near‐field imaging. The simplicity and versatility of the proposed approach proves attractive as a tabletop platform for the study of classical topological phases, as well as for applications benefiting the compactness of metasurfaces and the potential of topological insulators.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic‐Dual Metasurfaces for Topological States along a 1D Interface

Bisharat

Sievenpiper

2019

Laser & Photonics Reviews

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“…The near-field couplings happen near the slots. To people familiar with tensor impedance metasurfaces, the structure might be associated with sandwichlike impedance surface waveguides [46][47][48][49]. The key difference is the resonance.…”

Section: A Structure Designsmentioning

confidence: 99%

Rainbow Trapping with Long Oscillation Lifetimes in Gradient Magnetoinductive Metasurfaces

Shi

Davis

et al. 2019

Phys. Rev. Applied

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We report a gradient metasurface design at microwave bands as an elegant approach to realize the goal of "rainbow trapping" for the storage of waves involving wave localization and absorption phenomena. A longitudinally placed coplanar waveguide is loaded with gradient metasurfaces on both sides, where split-ring resonators (SRRs) are the basic cell. The same SRRs are arranged along the transverse direction to establish magnetoinductive channels. Waves of different frequencies are coupled to corresponding SRRs at different positions in metasurfaces. Resonant trapping with a long oscillation life time enhances the absorption caused by inherent losses of the materials, thereby suppressing reflections. Both simulations and measurements verify the existence of "rainbow trapping." The proposed strategy enhances the interaction between waves and matter, opening an avenue for further component designs, including absorptive filters, multiplexers, and buffers.

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“…42 But here, we will focus on the edge modes as principle players of plasmonic circuits similar to the proposal of Refs. 13,43 . In fact, our results will in general be valid for any two-dimensional system with an arbitrary conductivity tensor.…”

Section: Introductionmentioning

confidence: 99%

Unidirectional plasmonic edge modes on general two-dimensional materials

Stauber¹,

Nemilentsau²,

Low³

et al. 2019

2D Mater.

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We investigate the field and spin-momentum coupling of edge plasmons hosted by general twodimensional materials and identify sweet spots depending on the polarisation plane, ellipticity and the position of an electric dipole relative to the plane and edge. Exciting the dipole at these sweet spots by propagating light leads to uni-directional propagating edge plasmons or edge modes suppression. We also extend previous approximate treatments [A. Fetter Phys. Rev. B 32, 7676 (1985)] to include anisotropy and hyperbolic systems, elucidating its predictions for the existence of edge modes. A thorough assessment of the approximate description is carried out, comparing its spin-momentum coupling features in the near field with exact results from Wiener-Hopf techniques. Simulations are also performed confirming the overall picture. Our results shed new light on the quest of chiral plasmonics in 2D materials and should be relevant for future experiments. arXiv:1904.12741v2 [cond-mat.mes-hall]

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Guiding Waves Along an Infinitesimal Line between Impedance Surfaces

Cited by 81 publications

References 47 publications

Electromagnetic‐Dual Metasurfaces for Topological States along a 1D Interface

Electromagnetic‐Dual Metasurfaces for Topological States along a 1D Interface

Rainbow Trapping with Long Oscillation Lifetimes in Gradient Magnetoinductive Metasurfaces

Unidirectional plasmonic edge modes on general two-dimensional materials

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