{
  "annotation_id": "27b153e9-7051-4c2b-af24-3b97694ab321",
  "date_created": "2026-03-02T18:00:43.524000Z",
  "date_modified": "2026-03-02T18:00:43.524000Z",
  "file_hash": "1718abc20be52f25fbfb706b209058e2deb5f2bd7d5666f04fbfa4d84a67f514",
  "private": false,
  "record": {
    "abstract": "We investigate the spectral features of the emission from a superluminal\npolarization current whose distribution pattern rotates with an angular\nfrequency $\\omega$ and oscillates with an incommensurate frequency $\\Omega\n\u003e\\omega$. This type of polarization current is found in recent practical\nmachines designed to investigate superluminal emission. Although all of the\nprocesses involved are linear, we find that the broadband emission contains\nfrequencies that are higher than $\\Omega$ by a factor of the order of\n$(\\Omega/\\omega)^2$. This generation of frequencies {\\it not} required for the\ncreation of the source stems from mathematically rigorous consequences of the\nfamiliar classical expression for the retarded potential. The results suggest\npractical applications for superluminal polarization currents as broad-band\nradiofrequency and infrared sources.",
    "arxiv_id": "physics/0211088",
    "authors": [
      "H. Ardavan",
      "A. Ardavan",
      "J. Singleton"
    ],
    "categories": [
      "physics.optics",
      "physics.ins-det"
    ],
    "doi": "10.1364/JOSAA.20.002137",
    "title": "The frequency spectrum of focused broadband pulses of electromagnetic   radiation generated by polarization currents with superluminally rotating   distribution patterns",
    "url": "https://arxiv.org/abs/physics/0211088"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1b382567-c1d5-43e2-8861-81160ff58c95",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}