{
  "annotation_id": "d2a88ef4-5169-4aa7-97e4-1985a48ddab0",
  "date_created": "2026-03-02T18:01:00.406000Z",
  "date_modified": "2026-03-02T18:01:00.406000Z",
  "file_hash": "7f16bed8e7035c943d3fe1ee4e3ef50be11b80bef49c6c1114982b0e8f26ef03",
  "private": false,
  "record": {
    "abstract": "Quantum optical techniques may yield immersion fluids with high indices of\nrefraction without absorption. We describe one such technique in which a probe\nfield experiences a large index of refraction with amplification rather than\nabsorption, and examine its practicality for an immersion lithography\napplication. Enhanced index can be observed in a three-level system with a\ntunable, near-resonant, coherent probe and incoherent pump field that inverts\npopulation of the probe transition. This observation contradicts the common\nbelief that large indices of refraction are impossible without absorption,\nhowever it is well in accord with existing electromagnetic theory and practice.\nCalculations show that a refractive index \u003e\u003e 2 is possible with practical\nexperimental parameters. A scheme with an incoherent mixture of pumped and\nunpumped atoms is also examined, and is seen to have a lower refractive index\n(~2) accompanied by neither gain nor loss.",
    "arxiv_id": "physics/0509228",
    "authors": [
      "Vikas Anant",
      "Magnus R\u00e5dmark",
      "Ayman F. Abouraddy",
      "Thomas C. Killian",
      "Karl K. Berggren"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1116/1.2121732",
    "title": "Pumped quantum systems: immersion fluids of the future?",
    "url": "https://arxiv.org/abs/physics/0509228"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e79e2ed8-62e8-412e-afd4-92eb98f1214a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}