{
  "abstract": "Fano resonances based on coherent interference between localized Lorentz modes and Fabry-Perot radiation continua have been widely explored for microwave metamaterial sensors, filters, and photonic devices. However, conventional Fano metasurfaces suffer from angular dispersion and polarization-dependent spectral variations, limiting robustness under dynamic illumination. Here, we propose a band-folding-enabled flatband engineering strategy to realize robust Fano resonances in a planar microwave metasurface with a 2x2 enlarged cell of orthogonally arranged H-shaped metallic resonators. The enlarged cell induces Brillouin-zone folding, generating a nearly dispersionless flatband near 15.3 GHz with suppressed momentum dependence and enhanced photonic confinement. This flatband state provides a high-Q localized resonance strongly coupled to the FP radiation continuum, producing a stable asymmetric Fano response. Furthermore, the orthogonal resonator configuration supports two polarization-decoupled dipole modes with comparable excitation efficiency, reducing polarization-induced spectral distortion. Near-field measurements and simulations verify localized flatband features, while far-field experiments demonstrate stable Fano responses under oblique incidence from 0° to 30° with minor resonance variation. A temporal coupled-mode theory model is developed to quantitatively describe Fano spectral evolution under different illumination conditions. This work establishes a flatband-mediated route toward robust microwave Fano metasurfaces and offers a general strategy for stable resonant photonic device design.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.25902",
  "author_total": 11,
  "authors": [
    {
      "name": "Yangsong Ye"
    },
    {
      "name": "Hanchuan Chen"
    },
    {
      "name": "Shijie Kang"
    },
    {
      "name": "Haitao Li"
    },
    {
      "name": "Ken Qin"
    },
    {
      "name": "Boyuan Ge"
    },
    {
      "name": "Xiexuan Zhang"
    },
    {
      "name": "Jingrong He"
    },
    {
      "name": "Jiusi Yu"
    },
    {
      "name": "Xiaoxiao Wu"
    },
    {
      "name": "Chunlei Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9q7thjf5rt8ax.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.25902",
  "fulltext_url": null,
  "id": "9q7thjf5rt8ax",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.25902",
  "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",
      "2504|Metamaterials and Metasurfaces Applications"
    ]
  ],
  "openalex": "W7214069442",
  "pdf_url": "https://arxiv.org/pdf/2609.25902",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9q7thjf5rt8ax.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.25902",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.25902"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Orthogonal Flatbands-Enabled Robust Fano Resonances through Brillouin-Zone Folding",
  "title_text": "Orthogonal Flatbands-Enabled Robust Fano Resonances through Brillouin-Zone Folding",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/9q7thjf5rt8ax",
  "venue": "arXiv",
  "versions": []
}