{
  "annotation_id": "244d5850-6da0-4ca3-be08-85f7eb77e5d7",
  "date_created": "2026-03-02T18:01:10.918000Z",
  "date_modified": "2026-03-02T18:01:10.918000Z",
  "file_hash": "8ff8eb86edf34b128bd825d5f47e5d0db837b5806ff09ca7604671074e7f55ce",
  "private": false,
  "record": {
    "abstract": "We describe a way to determine the total angular momentum, both spin and\norbital, transferred to a particle trapped in optical tweezers. As an example\nan LG02 mode of a laser beam with varying degrees of circular polarisation is\nused to trap and rotate an elongated particle with a well defined geometry. The\nmethod successfully estimates the total optical torque applied to the particle.\nFor this technique, there is no need to measure the viscous drag on the\nparticle, as it is an optical measurement. Therefore, knowledge of the\nparticle\u0027s size and shape, as well as the fluid\u0027s viscosity, is not required.",
    "arxiv_id": "physics/0607216",
    "authors": [
      "Simon Parkin",
      "Gregor Knoener",
      "Timo A. Nieminen",
      "Norman R. Heckenberg",
      "Halina Rubinsztein-Dunlop"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1364/OE.14.006963",
    "journal_ref": "Optics Express, 14(15), 6963-6970 (2006)",
    "title": "Measurement of the total optical angular momentum transfer in optical   tweezers",
    "url": "https://arxiv.org/abs/physics/0607216"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6c2b7aeb-7519-486c-bfed-6bbecea2d965",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}