{
  "annotation_id": "618815ca-71da-4d16-8df0-02332862a3ed",
  "date_created": "2026-03-02T18:01:18.484000Z",
  "date_modified": "2026-03-02T18:01:18.484000Z",
  "file_hash": "07996c37b2b1a6aeb5bdbf7fab44cbd1939c6018fe155b8618de488c0162f3e3",
  "private": false,
  "record": {
    "abstract": "We provide a quantitative explanation of the mechanism of the far-field\nintensity modulation induced by a nanoparticle in a focused Gaussian laser\nbeam, as was demonstrated in several recent direct detection studies. Most\napproaches take advantage of interference between the incident light and the\nscattered light from a nanoparticle to facilitate a linear dependence of the\nsignal on the nanoparticle volume. The phase relation between the incoming\nfield and the scattered field by the nanoparticle is elucidated by the concept\nof Gouy phase. This phase relation is used to analyze the far-field\nsignal-to-noise ratio as a function of exact nanoparticle position with respect\nto the beam focus. The calculation suggests that a purely dispersive\nnanoparticle should be displaced from the Gaussian beam focus to generate a\nfar-field intensity change.",
    "arxiv_id": "physics/0702243",
    "authors": [
      "Jaesuk Hwang",
      "W. E. Moerner"
    ],
    "categories": [
      "physics.optics",
      "physics.class-ph"
    ],
    "doi": "10.1016/j.optcom.2007.08.032",
    "title": "Interferometry of a Single Nanoparticle Using the Gouy Phase of a   Focused Laser Beam",
    "url": "https://arxiv.org/abs/physics/0702243"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c6fa6331-ac2a-4584-acb0-1ebc867d5335",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}