{
  "abstract": "Silicon nitride photonic integrated circuits for the visible band are conventionally built with a buried oxide overcladding and singulated with wafer-scale tooling, constraints that preclude evanescent access to the guided mode for externally integrated emitters. We report a PECVD grown $Si_3N_4$ platform designed around an air-clad waveguide whose evanescent field remains accessible along the full device length. Two process elements make this geometry practical at chip scale. Fixed-beam moving-stage electron-beam lithography writes 500 nm single-mode waveguides as one continuous exposure across the 5 mm chip, removing write-field stitching which, given the $σ^{2}/d^{4}$ scaling of sidewall scattering in this high-confinement geometry at 635 nm, would otherwise dominate the loss budget. Chip singulation is performed by pen-type diamond scribing along lithographically patterned markers registered to in-plane direction, cleaving the Si(100) substrate to yield end-facets within $2^\\circ$ of normal at $80 \\%$ yield. Structural characterization by scanning electron microscopy confirms stitch-free waveguide geometry and undamaged, near-vertical scribed facets; light is coupled end-fire into fabricated devices and guided to a microring with evanescent bus-to-ring coupling confirmed by scattering imaging, and a sidewall-roughness-dependent scattering-loss model indicates that loss remains low in the roughness regime consistent with the observed facet and sidewall quality. Building on the intrinsic emitter-resonator coupling demonstrated in, this platform extends monolithic $Si_3N_4$ photonics toward scalable visible-to-near-infrared quantum and classical circuits.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.17480",
  "author_total": 8,
  "authors": [
    {
      "name": "Kishor Kumar Mandal"
    },
    {
      "name": "Lekshmi Eswaramoorthy"
    },
    {
      "name": "Parul Sharma"
    },
    {
      "name": "Anuj Kumar Singh"
    },
    {
      "name": "Brijesh Kumar"
    },
    {
      "name": "Tanmay Gupta"
    },
    {
      "name": "Venu Gopal Achanta"
    },
    {
      "name": "Anshuman Kumar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fc8yayvvqgvns.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.17480",
  "fulltext_url": null,
  "id": "fc8yayvvqgvns",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.17480",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2609.17480",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fc8yayvvqgvns.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.17480",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.17480"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Stitch-Free, Diamond-Scribed Silicon Nitride Photonic Integrated Circuits for the Visible Band",
  "title_text": "Stitch-Free, Diamond-Scribed Silicon Nitride Photonic Integrated Circuits for the Visible Band",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/fc8yayvvqgvns",
  "venue": "arXiv",
  "versions": []
}