4.8 Article

Photonic Topological States Mediated by Staggered Bianisotropy

期刊

LASER & PHOTONICS REVIEWS
卷 15, 期 2, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201900392

关键词

bianisotropy; edge states; Mie resonances; topological photonics

资金

  1. Russian Science Foundation [20-72-10065]
  2. Russian Foundation for Basic Research [19-02-00939, 18-02-00381, 19-02-00261]
  3. Foundation for the Advancement of Theoretical Physics and Mathematics Basis
  4. Australian Research Council Early Career Researcher Award [DE190100430]
  5. Russian Science Foundation [20-72-10065] Funding Source: Russian Science Foundation

向作者/读者索取更多资源

The study demonstrates that utilizing staggered bianisotropic response can achieve topological states in photonic structures, even in simple lattices. The reason behind this behavior lies in the difference in effective coupling between resonant elements with the same and opposite signs of bianisotropy. Therefore, by encoding spatially varying bianisotropy patterns in photonic structures, flexible engineering of topologically robust light localization and propagation can be achieved.
Photonic topological structures supporting spin-momentum locked topological states underpin a plethora of prospects and applications for disorder-robust routing of light. One of the cornerstone ideas to realize such states is to exploit uniform bianisotropic response in periodic structures with appropriate lattice symmetries, which together enable the topological bandgap. Here, it is demonstrated that staggered bianisotropic response gives rise to the topological states even in a simple lattice geometry whose counterpart with uniform bianisotropy is topologically trivial. The reason behind this intriguing behavior is in the difference in the effective coupling between the resonant elements with the same and with the opposite signs of bianisotropy. Based on this insight, a one-dimensional (1D) equidistant array is designed, which consists of high-index all-dielectric particles with alternating signs of bianisotropic response. The array possesses chiral symmetry and hosts topologically protected edge states pinned to the frequencies of hybrid magneto-electric modes. These results pave a way toward flexible engineering of topologically robust light localization and propagation by encoding spatially varying bianisotropy patterns in photonic structures.

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