November 21, 2022 Journal article Open Access

Mupparapu R.; Cunha J.; Tantussi F.; Jacassi A.; Summerer L.; Patrini M.; Giugni A.; Maserati L.; Alabastri A.; Garoli D.; Proietti Zaccaria R.

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{
  "DOI": "10.1002/aenm.202103785", 
  "author": [
    {
      "family": "Mupparapu R."
    }, 
    {
      "family": "Cunha J."
    }, 
    {
      "family": "Tantussi F."
    }, 
    {
      "family": "Jacassi A."
    }, 
    {
      "family": "Summerer L."
    }, 
    {
      "family": "Patrini M."
    }, 
    {
      "family": "Giugni A."
    }, 
    {
      "family": "Maserati L."
    }, 
    {
      "family": "Alabastri A."
    }, 
    {
      "family": "Garoli D."
    }, 
    {
      "family": "Proietti Zaccaria R."
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2022, 
        11, 
        21
      ]
    ]
  }, 
  "abstract": "<p>Numerous efforts have been undertaken to develop rectifying antennas operating&nbsp;at high frequencies, especially dedicated to light harvesting and photodetection&nbsp;applications. However, the development of efficient high frequency&nbsp;rectifying antennas has been a major technological challenge both due to a lack&nbsp;of comprehension of the underlying physics and limitations in the fabrication<br>\ntechniques. Various rectification strategies have been implemented, including&nbsp;metal-insulator-metal traveling-wave diodes, plasmonic nanogap optical&nbsp;antennas, and whisker diodes, although all show limited high-frequency operation<br>\nand modest conversion efficiencies. Here a new type of rectifying antenna&nbsp;based on plasmonic carrier generation is demonstrated. The proposed structure&nbsp;consists of a resonant metallic conical nano-antenna tip in contact with the oxide<br>\nsurface of an oxide/metal bilayer. The conical shape allows for an improved&nbsp;current generation based on plasmon-mediated electromagnetic-to-electron&nbsp;conversion, an effect exploiting the nanoscale-tip contact of the rectifying<br>\nantenna, and proportional to the antenna resonance and to the surface-electron&nbsp;scattering. Importantly, this solution provides rectification operation at 280 THz&nbsp;(1064 nm) with a 100-fold increase in efficiency compared to previously reported<br>\nresults. Finally, the conical rectifying antenna is also demonstrated to operate&nbsp;at 384 THz (780 nm), hence paving a way toward efficient rectennas toward the&nbsp;visible range.</p>", 
  "title": "High-Frequency Light Rectification by Nanoscale Plasmonic Conical Antenna in Point-Contact-Insulator-Metal Architecture", 
  "type": "article-journal", 
  "id": "7341380"
}