articleeLightMar 19, 2026DIAMOND OA

Robust chirality via merging accidental BICs with net zero topological charge

HHHui HuCZChaobiao ZhouYZYukang ZhangMHMeng-Xia HuJPJuntian Peng

Harbin Engineering University · Guizhou Minzu University · +7 more institutions

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Abstract

Abstract Chiral metasurfaces leveraging bound states in the continuum (BICs) offer a powerful route for enhancing light–matter interactions. However, existing quasi-BIC architectures typically face a fundamental trade-off between high quality (Q) factors and wide-angle chiral operation. Most designs confine strong circular dichroism (CD) to isolated points in momentum space (k-space) and often rely on intricate three-dimensional (3D) meta-atoms, rendering them highly sensitive to fabrication imperfections and angular misalignment. Here, we experimentally realize a planar dielectric metasurface that supports a wide k-domain chirality arising from accidental BICs with a net zero-topological-charge (ZTC). By…

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17

Topics & keywords

Topics
Keywords
  • Topology (electrical circuits)
  • Chirality (physics)
  • Angular momentum
  • Gravitational singularity
  • Metamaterial
  • Topological quantum number
  • Degeneracy (biology)
  • Polarization (electrochemistry)
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