{
  "annotation_id": "1169eb61-ea24-4af1-a27a-c7979c35e27d",
  "date_created": "2026-03-02T18:00:39.711000Z",
  "date_modified": "2026-03-02T18:00:39.711000Z",
  "file_hash": "6f1bf15cefb277c3d19c53cb0ff98f59feaf15d9754861c0ca09e21c08ae5b00",
  "private": false,
  "record": {
    "abstract": "We consider the problem of radiation into free space from the end-facet of a\nsingle-mode photonic crystal fiber (PCF). We calculate the numerical aperture\nNA=sin theta from the half-divergence angle theta ~ tan^{-1}(lambda/pi w) with\npi w^2 being the effective area of the mode in the PCF. For the fiber first\npresented by Knight et al. we find a numerical aperture NA ~ 0.07 which\ncompares to standard fiber technology. We also study the effect of different\nhole sizes and demonstrate that the PCF technology provides a large freedom for\nNA-engineering. Comparing to experiments we find good agreement.",
    "arxiv_id": "physics/0202073",
    "authors": [
      "N. A. Mortensen",
      "J. R. Folkenberg",
      "P. M. W. Skovgaard",
      "J. Broeng"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1109/LPT.2002.1021980",
    "journal_ref": "IEEE Photonics Technology Letters 14, 1094 (2002)",
    "title": "Numerical Aperture of Single-Mode Photonic Crystal Fibers",
    "url": "https://arxiv.org/abs/physics/0202073"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f5e1d660-51a9-4644-aa12-87f75bca83ff",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}