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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Surface plasmon delocalization in silver nanoparticle aggregates revealed by subdiffraction supercontinuum hot spots.

Nicholas J Borys1, Eyal Shafran, John M Lupton

  • 1Department of Physics & Astronomy, The University of Utah, Salt Lake City, UT 84112, USA. nborys@physics.utah.edu

Scientific Reports
|June 29, 2013
PubMed
Summary

Researchers studied nanostructured silver films, revealing how plasmonic hot spots transform. This work enhances understanding of plasmonic nanoresonators in disordered systems for advanced spectroscopy.

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Area of Science:

  • Plasmonics and Nanophotonics
  • Surface-Enhanced Raman Spectroscopy (SERS)
  • Nonlinear Optics

Background:

  • Nanostructured silver films exhibit strong surface enhancement for single-molecule Raman scattering.
  • Disordered plasmonic systems possess broad resonances, challenging conventional spectroscopic analysis.
  • Understanding plasmon mode transformations is crucial for optimizing nanophotonic devices.

Purpose of the Study:

  • To investigate the evolution of plasmonic modes in nanostructured silver films.
  • To characterize the transition from discrete nanoparticle resonances to delocalized surface plasmon excitations.
  • To identify novel plasmonic nanoresonators within highly disordered systems.

Main Methods:

  • Nonlinear excitation spectroscopy and polarization anisotropy.
  • Single optical hot spot analysis of supercontinuum generation.
  • Photon-localization microscopy to map plasmonic behavior.

Main Results:

  • Observed transformation of plasmon modes as film structure changes from discrete nanoparticles to aggregated layers.
  • Demonstrated transition from broad nanoparticle resonances to narrow (as low as 13 meV) delocalized surface plasmon excitations.
  • Revealed delocalized plasmons focusing multiple narrow radiation bands within 6 nm spatial regions.

Conclusions:

  • Disordered nanostructured silver films host novel plasmonic nanoresonators.
  • The study elucidates the mechanism of hot spot formation and plasmon delocalization.
  • Findings advance the application of plasmonics in advanced spectroscopic techniques.