{
  "annotation_id": "d9c71c5f-0acf-4f66-95e0-805ae0150112",
  "date_created": "2026-03-02T18:01:10.321000Z",
  "date_modified": "2026-03-02T18:01:10.321000Z",
  "file_hash": "3968bc5a4811abc6c87ad35879d4fe1de70a1f431c92acc288660ada8ff9dfcb",
  "private": false,
  "record": {
    "abstract": "We study the energy propagation in subwavelength waveguides and demonstrate\nthat the mechanism of material gain, previously suggested for loss\ncompensation, is also a powerful tool to manipulate dispersion and propagation\ncharacteristics of electromagnetic pulses at the nanoscale. We show\ntheoretically that the group velocity in lossy nano-waveguides can be\ncontrolled from slow to superluminal values by the material gain and waveguide\ngeometry and develop an analytical description of the relevant physics. We\nutilize the developed formalism to show that gain-assisted dispersion\nmanagement can be used to control the transition between ``photonic-funnel\u0027\u0027\nand ``photonic-compressor\u0027\u0027 regimes in tapered nano-waveguides. The phenomenon\nof strong modulation of group velocity in subwavelength structures can be\nrealized in waveguides with different geometries, and is present for both\nvolume and surface-modes.",
    "arxiv_id": "physics/0608097",
    "authors": [
      "Alexander A. Govyadinov",
      "Viktor A. Podolskiy"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevLett.97.223902",
    "journal_ref": "Phys. Rev. Lett. v.97, p.223902 (2006)",
    "title": "Gain-assisted slow to superluminal group velocity manipulation in   nano-waveguides",
    "url": "https://arxiv.org/abs/physics/0608097"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ce5d2c14-8041-4d7e-9279-86b26d8be352",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}