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arXiv · 2609.29074

Topology of bound states in the continuum from the angular structure of leading radiation

Nan Zhang·Ya Yan Lu
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Abstract

We show that the angular structure of the leading radiation associated with a bound state in the continuum (BIC) directly encodes topology, identifies the critical conditions for topological-charge transitions, and reveals the bifurcation of new BIC families under structural variations. For at-$Γ$ BICs, rotational and time-reversal symmetries determine the allowed angular harmonics of the leading radiation and hence the possible topological charges. As an example, we directly identify a BIC with $q=-5$ in a $C_{6v}$ dielectric slab with a triangular lattice of circular air holes, without computing nearby resonances or tracking the merging of BICs. This BIC is also a super-BIC, exhibiting an ultrahigh quality factor $Q\sim 1/δ^{10}$ along all directions in momentum space, where $δ$ is the wavevector detuning parameter. We also use a $C_{4v}$ structure to analyze a topological transition and the associated bifurcation of off-$Γ$ BICs. Our results may find applications in resonant, structured, and topological photonics.

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Nan Zhang, Ya Yan Lu. 2026-09-24. Topology of bound states in the continuum from the angular structure of leading radiation. https://arxiv.org/abs/2609.29074

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