{
  "abstract": "Quasi-bound states in the continuum (q-BICs) provide an effective approach for achieving strongly confined resonances in metasurfaces. However, the simultaneous realization of high-Q, polarization-multiplexed, and tunable resonances at a single frequency using a single resonant meta-atom remains challenging. Here, we numerically design and investigate a tunable all-dielectric terahertz (THz) metasurface consisting of a single asymmetric germanium (Ge) resonator by employing COMSOL Multiphysics. By introducing only one asymmetry parameter, the symmetry-protected BIC is transformed into a radiative q-BIC under two orthogonal linear polarizations. Through the coupling between the q-BIC and the intrinsic resonant mode, distinct interference responses are generated. Specifically, at the same frequency of 1.227 THz, a Fano resonance (Q = 606) is obtained under TE polarization, whereas an electromagnetically induced transparency (EIT)-like resonance (Q = 1105) appears under TM polarization. Owing to the tunable property of Ge, the two resonances can be actively modulated, achieving modulation depths of 96.7% and 99.1%, respectively. Furthermore, under TM polarization, the group delay can be continuously tuned from 0 to 259 ps by controlling the Ge conductivity. The proposed metasurface provides a compact platform for polarization-multiplexed and dynamically tunable THz photonic devices.",
  "abstract_shown": true,
  "affiliations": [
    "Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, China",
    "School of Electronics and Information Engineering, Anhui University, Hefei 230601, China"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Xilai Zhao",
      "orcid": "0000-0002-5824-0838"
    },
    {
      "affs": [
        0
      ],
      "name": "Jiahe Wang",
      "orcid": "0009-0003-3074-051X"
    },
    {
      "affs": [
        1
      ],
      "name": "Yifang Yuan"
    },
    {
      "affs": [
        0
      ],
      "name": "Jiangang Liang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/49dyzfgjvq53m.bib",
  "cited_by": 0,
  "doi": "10.3390/nano16191257",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667029/?tool=EBI",
  "id": "49dyzfgjvq53m",
  "issns": [
    "2079-4991"
  ],
  "landing_url": "https://europepmc.org/article/PMC/PMC13667029",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2504|Metamaterials and Metasurfaces Applications"
    ]
  ],
  "openalex": "W7220447854",
  "pdf_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667029/pdf/?tool=EBI",
  "pmcid": "PMC13667029",
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "MDPI AG",
  "ris": "https://research.draconitic.com/paper/49dyzfgjvq53m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:31Z",
      "native_id": "PMC:PMC13667029",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13667029"
    },
    {
      "first_seen": "2026-10-30T12:18:45Z",
      "native_id": "10.3390/nano16191257",
      "source": "crossref",
      "url": "https://www.mdpi.com/2079-4991/16/19/1257"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2504|Metamaterials and Metasurfaces Applications",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Quasi-Bound State in the Continuum-Driven Co-Frequency Polarization-Multiplexed Tunable Terahertz All Dielectric Metasurface",
  "title_text": "Quasi-Bound State in the Continuum-Driven Co-Frequency Polarization-Multiplexed Tunable Terahertz All Dielectric Metasurface",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:45Z",
  "url": "https://research.draconitic.com/paper/49dyzfgjvq53m",
  "venue": "Nanomaterials (Basel, Switzerland)",
  "versions": []
}