{
  "abstract": "Exceptional bound states in the continuum (EBICs) arise when bound states in the continuum (BICs) with distinct intrinsic losses coalesce at exceptional points (EPs), combining continuum-embedded wave confinement with a non-analytic spectral response. However, conventional EBICs rely on precisely controlled modal coupling and intrinsic loss, making them fragile and difficult to realize experimentally. Here, we introduce bulk-band topology to mitigate this fragility and experimentally realize a photonic exceptional topological BIC (ETBIC) in spoof surface plasmon polariton waveguides by merging two symmetry-protected topological BICs (TBICs) to coalesce at an EP, with the topological design supporting robust localization under symmetry-preserving perturbations. By engineering an intrinsic loss contrast and tuning the intermodal coupling, we directly resolve the coalescence of the complex eigenfrequencies, accompanied by measured near-field distributions consistent with the exceptional eigenstate. Furthermore, weak perturbations induce approximately square-root eigenfrequency splitting, yielding an enhanced spectral response compared with the approximately linear frequency shift of an isolated TBIC. These results establish bulk-band topology as a design principle for exceptional BIC engineering and provide a foundation for EBIC-based photonic sensing.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08103",
  "author_total": 3,
  "authors": [
    {
      "name": "Liren Chen"
    },
    {
      "name": "Jingming Chen"
    },
    {
      "name": "Zhen Gao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4esqk7zzmn45x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08103",
  "fulltext_url": null,
  "id": "4esqk7zzmn45x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08103",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08103",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4esqk7zzmn45x.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08103",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08103"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Photonic Exceptional Topological Bound States in the Continuum",
  "title_text": "Photonic Exceptional Topological Bound States in the Continuum",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/4esqk7zzmn45x",
  "venue": "arXiv",
  "versions": []
}