{
  "id": "1307.1815",
  "version": "v2",
  "published": "2013-07-06T21:17:07.000Z",
  "updated": "2016-12-07T00:28:08.000Z",
  "title": "Near field enhancement due to the optical response of small nanoparticles",
  "authors": [
    "Mario Zapata-Herrera",
    "Jefferson Flórez",
    "Angela Camacho",
    "Hanz Y. Ramirez"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "In this work we study the strong confinement effects on the electromagnetic response of metallic nanoparticles. We calculate the field enhancement factor for nanospheres of various radii by using optical constants obtained from both classical and quantum approaches and compare their size-dependent features. To evaluate the scattered near-field, we solve the electromagnetic wave equation within a finite element framework. When quantization of electronic states is considered for the input optical functions, a significant blue-shift in the resonance of the enhanced field is observed, in contrast to the case in which functions obtained classically are used. Furthermore, a noticeable underestimation of the field amplification is found in the calculation based on a classical dielectric function. Our results are in good agreement with available experimental reports and provide relevant information on the cross-over between classical and quantum regime, useful in potentiating nanoplasmonics applications.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-07-06T21:17:07.000Z",
      "abstract": "In this work, we propose to describe the behavior of the optical response of small metal nanoparticles (particles below 10 nm of radius) as a function of size. We use classical models as well as quantum approaches to study the nanoparticles dielectric function in the whole range of nanometers using two infinite confinements, cubic and spherical, which are simple enough to obtain information of the quantum size effects on the optical response, measured on the enhancement field factor and absorption spectra, to find the limit of pure classical models at the nano-scale finding out enhancement factors of the order of $10^3$ for small silver nanoparticles. We confirm the plasmon resonance frequency through the absorption spectra, besides that, we have studied the role played by Localized Surface Plasmon Resonance (LSPR) in small metal nanoparticles as a function of the particle size and the environment, which are in good agreement with reported experiments and have found a limit of the classical behavior of small nanoparticles.",
      "comment": null,
      "journal": null,
      "doi": null,
      "authors": [
        "Mario Zapata-Herrera",
        "Jefferson Flórez",
        "Angela Camacho"
      ]
    },
    {
      "version": "v2",
      "updated": "2016-12-07T00:28:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical response",
      "small nanoparticles",
      "field enhancement",
      "small metal nanoparticles",
      "absorption spectra"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013arXiv1307.1815Z"
    }
  }
}