{
  "id": "2408.14798",
  "version": "v1",
  "published": "2024-08-27T06:08:16.000Z",
  "updated": "2024-08-27T06:08:16.000Z",
  "title": "Nonlinear thermoplasmonics in graphene nanostructures",
  "authors": [
    "Line Jelver",
    "Joel D. Cox"
  ],
  "comment": "12 pages, 7 figures",
  "categories": [
    "cond-mat.mes-hall",
    "physics.optics"
  ],
  "abstract": "The linear electronic dispersion relation of graphene endows the atomically thin carbon layer with a large intrinsic optical nonlinearity, with regard to both parametric and photothermal processes. While plasmons in graphene nanostructures can further enhance nonlinear optical phenomena, boosting resonances to the technologically relevant mid- and near-infrared (IR) spectral regime necessitates patterning on $\\sim10$ nm length scales, for which quantum finite-size effects play a crucial role. Here we show that thermoplasmons in narrow graphene nanoribbons can be activated at mid- and near-IR frequencies with moderate absorbed energy density, and furthermore can drive substantial third-harmonic generation and optical Kerr nonlinearities. Our findings suggest that photothermal excitation by ultrashort optical pulses offers a promising approach to enable nonlinear plasmonic phenomena in nanostructured graphene that avoids potentially invasive electrical gating schemes and excessive charge carrier doping levels.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-08-27T06:08:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "graphene nanostructures",
      "nonlinear thermoplasmonics",
      "charge carrier doping levels",
      "invasive electrical gating schemes",
      "linear electronic dispersion relation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}