{
  "annotation_id": "129a0260-e60a-4ae8-abbb-09e57b6ff15c",
  "date_created": "2026-03-02T18:01:17.639000Z",
  "date_modified": "2026-03-02T18:01:17.639000Z",
  "file_hash": "0b77323620952428e4e1dbef6e7ba8d22609a900965c30bad5f5384e2393074b",
  "private": false,
  "record": {
    "abstract": "Fresnel zone plates are diffractive elements that are essential to form\nimages in many scientific and technological areas, especially where refractive\noptics is not available. One of the main shortcomings of Fresnel zone plates,\nwhich limit their utility with broadband sources, is their high chromatic\naberration. Recently presented, Fractal Zone Plates (FZPs) are diffractive\nlenses characterized by an extended focal depth with a fractal structure. This\nbehaviour predicts an improved performance of FZPs as image forming devices\nwith an extended depth of field and a reduced chromatic aberration. Here we\nreport the achievement of the first polychromatic images obtained with a FZP\nthat confirm these predictions. We show that the polychromatic modulation\ntransfer function (MTF) of a FZP affected by defocus is about two times better\nthan one corresponding to a Fresnel zone plate. This result opens the\npossibility to improve imaging techniques that use conventional Fresnel zone\nplates over a wide range of the electromagnetic spectrum, ranging from x-rays\nto THz.",
    "arxiv_id": "physics/0701211",
    "authors": [
      "Walter D. Furlan",
      "Genaro Saavedra",
      "Juan A. Monsoriu"
    ],
    "categories": [
      "physics.optics"
    ],
    "title": "Fractal zone plates for wideband imaging with low chromatic aberration   and extended depth of field",
    "url": "https://arxiv.org/abs/physics/0701211"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5efe5f89-7ec8-4075-894f-7afe6c43b488",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}