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Nonlinear plasmonic response in atomically thin metal films.

Álvaro Rodríguez Echarri1, Joel D Cox2,3, Fadil Iyikanat1

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.

Nanophotonics (Berlin, Germany)
|November 25, 2022
PubMed
Summary

Atomically thin metal films significantly enhance nanoscale nonlinear optics. This research shows that reducing film thickness boosts plasmon-enhanced optical phenomena due to unique electronic and surface properties.

Keywords:
atomically thin filmsnanophotonicsnonlinear opticsplasmon polaritonsscanning near-field optical microscopy (SNOM)

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Area of Science:

  • Condensed matter physics
  • Plasmonics
  • Nanophotonics

Background:

  • Nanoscale nonlinear optics faces limitations from weak material responses and small light-matter interactions.
  • Plasmonic excitations offer enhanced light focusing but incur significant losses, especially with fabrication defects.

Purpose of the Study:

  • To theoretically investigate enhanced nonlinear optical responses in atomically thin noble metal films.
  • To explore the role of confined plasmon polaritons in boosting nonlinear optical phenomena.

Main Methods:

  • Utilizing quantum-mechanical simulations to model nonlinear optical responses.
  • Incorporating electronic band structure features like vertical quantum confinement, electron spill-out, and surface states.

Main Results:

  • An overall enhancement of plasmon-mediated nonlinear optical phenomena was predicted as film thickness decreases.
  • The study highlights the critical influence of surface and electronic structure on the optical response of ultrathin metal films.

Conclusions:

  • Extremely confined plasmon polaritons in few-atom-thick metal films offer a pathway to overcome limitations in nanoscale nonlinear optics.
  • Controlling film thickness and understanding electronic properties are key to optimizing nonlinear optical applications in nanostructures.