Cited by 515Orbital Angular Momentum in OpticsPlasmonic and Surface Plasmon ResearchTopological Materials and Phenomena

The DOI matches its Crossref record; 55 of the 55 references it cites were found in a registry or an index; none of the 4 sources its claims cite is checked for support yet.

Optical skyrmion lattice in evanescent electromagnetic fields

Open access

Abstract

Generating a lattice of optical skyrmions: The topological properties of systems can be robust to defects and imperfections. Skyrmions are one such topological entity, which resemble “hedgehog-like” structures. Tsesses et al. controlled the interference of plasmon polaritons on a patterned metallic surface to generate a lattice of optical skyrmions. Such control could potentially optically mimic complex condensed matter systems or help in the development of robust optical communications and circuits. Science , this issue p. 993

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

The paper predicts and experimentally observes an optical skyrmion lattice formed by interfering evanescent electromagnetic waves, specifically surface plasmon polaritons. It shows that the electric-field vector can form Néel-type or bubble-type skyrmions and that the topological invariant is robust to losses and imperfections.

Key findings

  • An optical skyrmion lattice is theoretically described using six interfering TM guided waves, with each lattice site forming a Néel-type skyrmion and calculated skyrmion number \(S = 1\).
  • The skyrmion domain walls can be tuned from bubble-type to Néel-type by changing the transverse wave vector; the skyrmion number density contrast converges to 0.5 for the Néel-type case.
  • Experimentally, surface plasmon polaritons on an air–gold interface produce a plasmonic skyrmion lattice with measured skyrmion number \(S = 0.997 \pm 0.058\).
  • Loss robustness is quantified: 49 unit cells can exhibit \(S > 0.99\) if the waves persist for roughly 400 periods before decaying; the experimental sample had 37 lattice sites.

Methods

  • Theory: six equal-amplitude TM guided waves propagating in the transverse plane with transverse wave vectors of similar magnitude create three standing waves at 0°, 60°, and 120°; the axial electric field is expressed as a sum of three cosine functions, and the skyrmion number is computed from the normalized three-component electric field.
  • Experiment: SPPs are excited at an air–gold interface using a hexagonally shaped coupling slit and 660 nm circularly polarized light; the sample consists of six gratings on a 200 nm Au layer on a 1 mm glass substrate, with grating periodicity corresponding to the plasmonic wavelength of 636 nm.
  • Measurement: phase-resolved near-field optical microscopy (s-NSOM) with pseudo-heterodyne interferometric detection measures the axial electric field at 20 nm resolution; spatial Fourier filtering is used to remove noise before extracting transverse field components and skyrmion number.

Limitations

  • Stated: losses distort the unit vector \(e = E/|E|\) and create an unwanted phase difference between components; in the small-loss regime the real part still yields a well-defined skyrmion lattice, but \(S\) deviates slightly from its quantized value due to weak breaking of lattice translation symmetry, increasingly for unit cells farther from the origin.
  • Stated: the finite structure and unequal SPP amplitudes—caused by different propagation lengths of SPPs generated by two slit edges and propagation loss—distort the skyrmion lattice.
  • Evident from the text: the experiment demonstrates a bubble-type lattice at the center of the sample, while the full tuning from bubble-type to Néel-type skyrmions is shown theoretically; TE-polarized magnetic-field skyrmions are proposed but not experimentally demonstrated.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1126/science.aau0227

Cites

55 of 55 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 4 cited sources checked · 0 supported · 0 flagged

Show all 19 claims

  • It may state two separate claims as one. 11
  • Probably not a substantial claim. 2
13 of 13
  • The paper relies on this without support.

    The field of optical skyrmions has so far remained untapped by experimental investigation.

    “However, only recently has there been any experimental investigation of optical topological domain walls (38), while the field of optical skyrmions has so far remained untapped.”
1 of 1

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Figure 1 cites Eq. 4 for a field defined by Eq. 3

    Minor

    The caption attributes the transverse electric-field amplitude to Eq. 4, but the paper identifies Eqs. (2,3) as the equations describing the electric field in Figure 1; Eq. 3 is introduced as the transverse-field equation.

  • Figure 5 points to Figure 3 for the measurement system

    Minor

    Figure 5 says the measurement system is described in Figure 3, whereas Figure 4 is labeled as the experimental setup and sample characterization. Figure 3 instead concerns theoretical persistence in the presence of loss.

2 of 2

Citations

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Metadata

Authors
Tsesses, S., Ostrovsky, E., Cohen, K., Gjonaj, B., Lindner, N. H., & Bartal, G.
Affiliations
  • Technion – Israel Institute of Technology (IL)
  • Albanian University (AL)
Corresponding author
Bartal, G.
Venue
Science
Published
2018-09-07
Volume
361
Issue
6406
Pages
993-996
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2884207325
Cited by
514
References
49
Citations by year
2026: 129 · 2025: 122 · 2024: 84 · 2023: 58 · 2022: 38 · 2021: 36 · 2020: 30 · 2019: 16 · 2018: 1
FWCI
9.96
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Figshare (submittedVersion, public-domain)
  • arXiv (Cornell University)
Funders
  • H2020 European Research Council (639172)
  • “Circle of Light,” Israeli Centers for Research Excellence (Israel Science Foundation (ISF) (1802/12))
  • "Circle of Light", Israeli Centers of Research Excellence (Israel Science Foundation (ISF) (1802/12))
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Orbital Angular Momentum in Optics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Plasmonic and Surface Plasmon Research
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Topological Materials and Phenomena
Keywords
surface plasmon polaritons, topological defects, Néel skyrmions, topological domain walls, photonic systems, optical information processing

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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

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