Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
Open accessAbstract
Photonic analogue of topological insulator was recently predicted by arranging ε/μ (permittivity/permeability)-matched bianisotropic metamaterials into two-dimensional superlattices. However, the experimental observation of such photonic topological insulator is challenging as bianisotropic metamaterial is usually highly dispersive, so that the ε/μ-matching condition can only be satisfied in a narrow frequency range. Here we experimentally realize a photonic topological insulator by embedding non-bianisotropic and non-resonant metacrystal into a waveguide. The cross coupling between transverse electric and transverse magnetic modes exists in metacrystal waveguide. Using this approach, the ε/μ-matching condition is satisfied in a broad frequency range which facilitates experimental observation. The topologically non-trivial bandgap is confirmed by experimentally measured transmission spectra and calculated non-zero spin Chern numbers. Gapless spin-filtered edge states are demonstrated experimentally by measuring the magnitude and phase of the fields. The transport robustness of the edge states is also observed when an obstacle was introduced near the edge.
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Currently proposed PTIs and STIs usually require covers to confine the waves in the vertical direction to prevent radiative leakage into free space.
“However, currently proposed PTIs and STIs usually require covers to confine the waves in the vertical direction to prevent radiative leakage into free space20–25.”
From Direct observation of valley-polarized topological edge states in designer surface plasmon crystals (2017) · cites this paper as [22]
The Designs of PTI and POI metacrystal waveguides section (Fig. 1; page unavailable) describes this paper’s PTI sample with a top copper plate, and the conceptual-waveguide section describes a pair of parallel plates. These passages support a covered-waveguide example, but do not establish that proposed PTIs and STIs usually require covers or state that the purpose is to prevent radiative leakage into free space. (LLM, conf=0.78)
Experimental — accuracy not yet measuredThe trace of holonomy is a gauge invariant observable called the Wilson loop of the closed path c.
“Nevertheless, the trace of holonomy is an important gauge invariant observable, called the Wilson loop of the closed path c:26”
From Non-Abelian gauge field optics (2019) · cites this paper as [26]
The 'Topological phases in conceptual metacrystal waveguides' section discusses spin Chern numbers as topological invariants, not the trace of holonomy. Searches for 'trace of holonomy gauge invariant observable Wilson loop closed path' and 'Wilson loop holonomy' found no passage in our copy defining a Wilson loop or addressing the claimed gauge invariance. (LLM, conf=0.72)
Experimental — accuracy not yet measured
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- Authors
- Chen, W.-J., Jiang, S.-J., Chen, X.-D., Zhu, B., Zhou, L., Dong, J.-W., & Chan, C. T.
- Affiliations
- Sun Yat-sen University (CN)
- Fudan University (CN)
- Hong Kong University of Science and Technology (HK)
- Corresponding author
- Dong, Jian-Wen
- Venue
- Nature Communications
- Published
- 2014-12-17
- Volume
- 5
- Issue
- 1
- Pages
- 5782-5782
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2049503351
- Cited by
- 555
- References
- 29
- Citations by year
- 2026: 15 · 2025: 32 · 2024: 40 · 2023: 43 · 2022: 46 · 2021: 56 · 2020: 63 · 2019: 60 · 2018: 62 · 2017: 73 · 2016: 42 · 2015: 20 · 2014: 3
- FWCI
- 22.90
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Nature Communications (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Natural Science Foundation of China (2014CB931700, 11274396)
- Program for New Century Excellent Talents in University
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Non-Hermitian Physics
- Keywords
- photonic topological insulators, waveguides, bianisotropic metamaterials, spin Chern number, gapless edge states, transmission spectra
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