{
  "abstract": "Thin film lithium niobate (TFLN) is a promising integrated photonic platform owing to its large quadratic nonlinearity enabling vital applications such as second-harmonic generation (SHG), optical parametric amplification, and spontaneous parametric down-conversion. However, to achieve high SH conversion efficiency, quasi-phase matching (QPM) through periodic electrical poling is typically required, which remains challenging in certain applications like multiple-ring coupled devices. Here, we demonstrate a surface molecule patterning strategy to enable QPM in a poling-free TFLN microring for SHG. An on-chip normalized conversion efficiency of approximately 11.5%/W is obtained in the poling-free TFLN microring with surface molecular pattern, showing an approximate 400-fold improvement compared to the same microring without surface molecular pattern. This approach offers a versatile route to engineer interfacial nonlinear interactions for nonlinear optics and quantum photonics applications and may be extended to multiple-ring coupled resonators and other platforms.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.29417",
  "author_total": 6,
  "authors": [
    {
      "name": "Jinsong Cheng"
    },
    {
      "name": "Simin Yu"
    },
    {
      "name": "Jiahe Wang"
    },
    {
      "name": "Yilun Zhang"
    },
    {
      "name": "Juanjuan Lu"
    },
    {
      "name": "Xiaoqin Shen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8zemxhqrbj4w0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.29417",
  "fulltext_url": null,
  "id": "8zemxhqrbj4w0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.29417",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Photorefractive and Nonlinear Optics"
    ]
  ],
  "openalex": "W7223208791",
  "pdf_url": "https://arxiv.org/pdf/2610.29417",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8zemxhqrbj4w0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:19Z",
      "native_id": "2610.29417",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.29417"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Quasi-Phase-Matched Second Harmonic Generation in Poling-Free Lithium Niobate Microrings with Surface Molecular Pattern",
  "title_text": "Quasi-Phase-Matched Second Harmonic Generation in Poling-Free Lithium Niobate Microrings with Surface Molecular Pattern",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:19Z",
  "url": "https://research.draconitic.com/paper/8zemxhqrbj4w0",
  "venue": "arXiv",
  "versions": []
}