{
  "annotation_id": "d8fc0426-07ee-4573-a57b-a6933a4ec7f7",
  "date_created": "2026-03-02T18:00:46.101000Z",
  "date_modified": "2026-03-02T18:00:46.101000Z",
  "file_hash": "5dd9dacb6c129eda174b9c3ee98f02bbde40756a6b17b332d30be73eb957f80e",
  "private": false,
  "record": {
    "abstract": "Based on the scalar Helmholtz equation and the finite-difference\napproximation, we formulate a matrix eigenvalue problem for the calculation of\npropagation constants, beta(omega), in micro-structured optical fibres. The\nmethod is applied to index-guiding fibres as well as air-core photonic bandgap\nfibres, and in both cases qualitatively correct results are found. The strength\nof this approach lies in its very simple numerical implementation and its\nability to find eigenmodes at a specific eigenvalue, which is of great\ninterest, when modelling defect modes in photonic bandgap fibres.",
    "arxiv_id": "physics/0307075",
    "authors": [
      "Jesper Riishede",
      "Niels Asger Mortensen",
      "Jesper Laegsgaard"
    ],
    "categories": [
      "physics.optics",
      "physics.ed-ph"
    ],
    "doi": "10.1088/1464-4258/5/5/316",
    "journal_ref": "J. Opt. A: Pure Appl. Opt. 5, 534 (2003)",
    "title": "A \"poor man\u0027s approach\" to modelling of micro-structured optical fibres",
    "url": "https://arxiv.org/abs/physics/0307075"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0b4aba87-97cb-433f-9fd4-b6477e701fbb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}