Mechanically-reconfigurable edge states in an ultrathin valley-hall topological metamaterial

Yahong Liu*, Huiling Ren, Liyun Tao, Lianlian Du, Xin Zhou, Meize Li, Kun Song, Ruonan Ji, Xiaopeng Zhao, Miguel Navarro-Cia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Broadband topological metamaterials hold the key for designing the next generation of integrated photonic platforms and microwave devices given their protected back-scattering-free and unidirectional edge states, among other exotic properties. However, synthesizing such metamaterial has proven challenging. Here, a broadband bandgap (relative bandwidth of more than 43%) Valley-Hall topological metamaterial with deep subwavelength thickness is proposed. The present topological metamaterial is composed of three layers printed circuit boards whose total thickness is 1.524 mm ≈ λ/100. The topological phase transition is achieved by introducing an asymmetry parameter δr. Three mechanically reconfigurable edge states can be obtained by varying interlayer displacement. Their robust transmission is demonstrated through two kinds of waveguide domain walls with cavities and disorders. Exploiting the proposed topological metamaterial, a six-way power divider is constructed and measured as a proof-of-concept of the potential of the proposed technology for future electromagnetic devices.
Original languageEnglish
Article number2200998
Number of pages11
JournalAdvanced Materials Interfaces
Volume9
Issue number26
Early online date18 Aug 2022
DOIs
Publication statusPublished - 13 Sept 2022

Bibliographical note

Funding Information:
Y.L. acknowledged support from the National Natural Science Foundation of China (Grant No.11874301), and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2020JM‐094). M. N.‐C acknowledges support from the University of Birmingham (Birmingham Fellowship) and the European Union's Horizon 2020 research and innovation program (Grant No. 777714).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • topological metamaterials
  • edge state
  • topological phase transition
  • reconfigurable topological edge states
  • robust transmission of waveguide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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