articleLight Science & ApplicationsJan 23, 2026GOLD OA

Robust ultrahigh-Q resonances in tetramer metasurfaces through centroid symmetry protection and area conservation

CZChaobiao ZhouRJRong JinHHHaoxuan HeJHJing HuangGLGuanhai Li

Guizhou Minzu University · Shanghai Institute of Technical Physics · +4 more institutions

PubMed
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Abstract

Abstract Ultrahigh-Q optical resonances are the cornerstone of next-generation nanophotonic technologies, but their simultaneous realization of robustness and on-chip practicality remains a significant challenge. In this work, we present tetramer composite metasurfaces capable of supporting two distinct classes of ultrahigh-Q resonances: centroid symmetry-protected bound states in the continuum (SP-BICs) and area-conserved guided-mode resonances (GMRs). By employing a four-hole supercell design, we demonstrate that centering each hole within its subcell preserves C 4v symmetry, thereby enabling SP-BICs. Controlled lateral displacement transforms them into quasi-BICs with Q > 10⁶. Independently, enforcing…

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Topics & keywords

Topics
Keywords
  • Centroid
  • Degenerate energy levels
  • Robustness (evolution)
  • Nanophotonics
  • Photonic crystal
  • Metamaterial
  • Degrees of freedom (physics and chemistry)
  • Supercell
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