{
  "abstract": "We present a theoretical study of Cherenkov and transition radiation for swift electron beams penetrating dielectric nanospheres using material models of different sophistication. Specifically, we perform a combined time-domain (numerically, via the discontinuous Galerkin time-domain method) and frequency-domain (numerically and analytically, via Mie-based theory) study, including the induced-field distribution, cathodoluminescence (CL) multipole/directional decomposition, as well as the time-dependent angular power flow. For low velocities below the Cherenkov threshold, we show that transition radiation is dominant in the far-field CL, and the near-fields at the transition points are primarily responsible for the main features observed in the far-field. For higher velocities far beyond the Cherenkov threshold, we identify the fingerprints of the observable Cherenkov front. Specifically, a constant-permittivity model allows us to isolate the respective contributions of CR and TR to the far-field radiation, thereby facilitating the interpretation of the results for a more realistic material model that includes material resonances. Our combined time- and frequency-domain framework provides a direct view of radiative excitation channels for swift electron beams penetrating dielectric nanoparticles, thereby revealing their interplay beyond the conventional frequency-domain analyses.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: ACS Photonics 13, 5826 (2026)",
  "arxiv": "2606.20081",
  "author_total": 4,
  "authors": [
    {
      "name": "Wenhua Zhao"
    },
    {
      "name": "Christos Tserkezis"
    },
    {
      "name": "N. Asger Mortensen"
    },
    {
      "name": "Kurt Busch"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/815wma5hdcn0e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.20081",
  "fulltext_url": null,
  "id": "815wma5hdcn0e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.20081",
  "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/2606.20081",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/815wma5hdcn0e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2606.20081",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.20081"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Time- and frequency-domain study for electron beams penetrating dielectric nanospheres: fingerprints of Cherenkov and transition radiation",
  "title_text": "Time- and frequency-domain study for electron beams penetrating dielectric nanospheres: fingerprints of Cherenkov and transition radiation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/815wma5hdcn0e",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1021/acsphotonics.6c01605",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}