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Intrinsic luminescence blinking from plasmonic nanojunctions.

Wen Chen1, Philippe Roelli1,2, Aqeel Ahmed1

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Spectral fluctuations in gold nanojunctions reveal light-induced atomic restructuring. This internal metal dynamics, observed via luminescence blinking, offers new insights into plasmonic cavities.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Surface Science
  • Quantum Optics

Background:

  • Plasmonic nanojunctions exhibit localized plasmon resonances, enhancing light-matter interactions and concentrating electromagnetic fields at the nanoscale.
  • The optical response in this regime is influenced by complex dynamical phenomena across bulk, molecular, and atomic scales.
  • Understanding these nanoscale phenomena is crucial for advancing plasmonic applications.

Purpose of the Study:

  • To investigate the spectral fluctuations in intrinsic light emission from photo-excited gold nanojunctions.
  • To elucidate the underlying mechanisms responsible for these fluctuations, particularly luminescence blinking.
  • To explore the relationship between internal metal restructuring and the optical response of plasmonic cavities.

Main Methods:

  • Fabrication and characterization of gold nanojunctions.
  • Optical spectroscopy, including measurements of light emission and Raman scattering.
  • In-situ investigation of photo-induced dynamical phenomena within the nanojunctions.

Main Results:

  • Observed ubiquitous spectral fluctuations in the intrinsic light emission from photo-excited gold nanojunctions.
  • Attributed these fluctuations to light-induced formation of domain boundaries and quantum-confined emitters within the gold.
  • Demonstrated that photoexcited carriers and adatom-molecule interactions trigger luminescence blinking.
  • Found no measurable impact of this internal restructuring on the Raman signal and scattering spectrum of the plasmonic cavity.

Conclusions:

  • Metal luminescence serves as a sensitive probe for atomic fluctuations in plasmonic cavities.
  • Luminescence blinking in gold nanojunctions is linked to light-induced internal restructuring.
  • This provides a complementary technique to optical and electrical methods for studying nanoscale dynamics in plasmonics.