{
  "abstract": "Multiband Fano resonances are demonstrated in the near-infrared (near-IR) using an all-dielectric metasurface whose unit cell consists of four silicon nanoblocks on a glass substrate. An in-plane asymmetry triggers symmetry-protected quasi-bound states in the continuum (QBICs), producing multiple high-Q resonances. Their origin is identified through multipolar decomposition of the scattering cross section and field distributions at the resonances. The strong field localization at these resonances enables efficient multiband third-harmonic (TH) generation in the ultraviolet (UV), with a maximum simulated conversion efficiency of $8.5 \\times 10^{-3}$ at a peak pump intensity of $1.6\\,\\mathrm{GW/cm^{2}}$. The metasurface is fabricated in symmetric and asymmetric configurations, and its linear and nonlinear responses are measured under normal incidence. A TH conversion efficiency of $1.2 \\times 10^{-6}$ is obtained at a peak pump intensity of $3.25\\,\\mathrm{GW/cm^{2}}$. These results establish a route to multiband photonic devices, including multiwavelength lasers, multiband harmonic generation, and single-photon sources for quantum photonics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.13746",
  "author_total": 7,
  "authors": [
    {
      "name": "Partha Mondal"
    },
    {
      "name": "Hadeel Alamoudi"
    },
    {
      "name": "Rodrigo P. Sanchez"
    },
    {
      "name": "Redha H. Al Ibrahim"
    },
    {
      "name": "Boon S. Ooi"
    },
    {
      "name": "Iman Roqan"
    },
    {
      "name": "Hakan Bagci"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2gg9yhfbwwzbg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.13746",
  "fulltext_url": null,
  "id": "2gg9yhfbwwzbg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.13746",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2504|Metamaterials and Metasurfaces Applications"
    ]
  ],
  "openalex": "W7203632638",
  "pdf_url": "https://arxiv.org/pdf/2608.13746",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2gg9yhfbwwzbg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2608.13746",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.13746"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Enhanced Third-Harmonic Generation in a Bound State in the Continuum Assisted Multiband All-Dielectric Metasurface",
  "title_text": "Enhanced Third-Harmonic Generation in a Bound State in the Continuum Assisted Multiband All-Dielectric Metasurface",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/2gg9yhfbwwzbg",
  "venue": "arXiv",
  "versions": []
}