Experimental Demonstration of Chiral Bound States in the Continuum Enabled by Time-reversal Symmetry Breaking

@misc{mo2026experimental,
  title = {{Experimental Demonstration of Chiral Bound States in the Continuum Enabled by Time-reversal Symmetry Breaking}},
  author = {Hao-Chang Mo and Wen-Jin Zhang and Ze-Yu Wu and Xin-Tao He and Xiao-Dong Chen and Jian-Wen Dong},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.38826},
  eprint = {2609.38826},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.38826},
}

TY  - UNPB
TI  - Experimental Demonstration of Chiral Bound States in the Continuum Enabled by Time-reversal Symmetry Breaking
AU  - Hao-Chang Mo
AU  - Wen-Jin Zhang
AU  - Ze-Yu Wu
AU  - Xin-Tao He
AU  - Xiao-Dong Chen
AU  - Jian-Wen Dong
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.38826
UR  - https://arxiv.org/abs/2609.38826
AB  - Bound states in the continuum (BICs) provide a powerful route to optical resonances with vanishing radiation loss and enhanced light-matter interactions. Of particular interest are chiral BICs, whose resonant states exhibit intrinsic circular polarization and spin-selective radiation. Magneto-optical photonic crystals have recently been predicted to host such states through time-reversal-symmetry breaking. Here, we experimentally demonstrate chiral BICs induced by time-reversal symmetry breaking in a magneto-optical photonic crystal, where an out-of-plane magnetic field lifts a degenerate BIC pair into two nondegenerate resonances with opposite circular polarizations. Numerical simulations reveal the associated chiral phase vortices and strong spin-selective radiation, while microwave measurements confirm the predicted behavior through angle-resolved transmission spectra and pronounced broadband circular dichroism. Our results establish an experimental platform for exploring chiral BIC physics in magneto-optical photonic structures, opening new opportunities for spin-selective photonics.
ER  -