{
  "abstract": "High quality factor ($Q$) and overtone operation enable narrow-linewidth acoustic devices with multiple discrete frequencies in a single cavity. Maintaining both high $Q$ and sufficient electromechanical coupling at higher mode orders remains challenging. Here, we demonstrate a bimorph periodically poled piezoelectric film (P3F) lithium niobate (LN) platform for high-order thickness-shear (TS) overtone excitation. The device comprises a bonded 80-$μ$m-thick single-crystal X-cut LN bimorph with opposite polarizations, patterned top and floating bottom electrodes, and a suspended air cavity. The P3F configuration mitigates charge cancellation from the alternating stress distribution of higher-order TS modes, enabling measurable coupling across a broad sequence of overtones. The thick LN acoustic cavity and increasingly confined high-order mode profiles support low-loss operation. Measured TS overtones extend to 1.75 GHz. At room temperature, representative overtones at 0.77 and 0.89 GHz exhibit 3-dB $Q$ values of 11,338 and 11,917, corresponding to $fQ$ products of $8.74\\times10^{12}$ and $1.06\\times10^{13}$ Hz, respectively. Cooling from 297 to 12 K systematically enhances $Q$, yielding a peak 3-dB $Q$ of 20,507 at 779 MHz and a maximum $fQ$ product of $1.98\\times10^{13}$ Hz at 1.379 GHz. These results establish bimorph P3F LN as a promising platform for high-$Q$, frequency-scalable micro-acoustic resonators in the sub-GHz and low-GHz regimes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.14222",
  "author_total": 6,
  "authors": [
    {
      "name": "Ziqian Yao"
    },
    {
      "name": "Ian Anderson"
    },
    {
      "name": "Tzu-Hsuan Hsu"
    },
    {
      "name": "Vakhtang Chulukhadze"
    },
    {
      "name": "Jack Kramer"
    },
    {
      "name": "Ruochen Lu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8mfpcqd71bv2k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.14222",
  "fulltext_url": null,
  "id": "8mfpcqd71bv2k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.14222",
  "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.app-ph"
    ],
    [
      "openalex",
      "2204|Acoustic Wave Resonator Technologies"
    ]
  ],
  "openalex": "W7213329353",
  "pdf_url": "https://arxiv.org/pdf/2609.14222",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8mfpcqd71bv2k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.14222",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.14222"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Bimorph Lithium Niobate Thickness-Shear Overtone Film Bulk Acoustic Resonator",
  "title_text": "Bimorph Lithium Niobate Thickness-Shear Overtone Film Bulk Acoustic Resonator",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/8mfpcqd71bv2k",
  "venue": "arXiv",
  "versions": []
}