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Area of Science:

  • Plasmonics and Nanophotonics
  • Optical Spectroscopy
  • Scanning Probe Microscopy

Background:

  • Plasmonic nanoparticles exhibit unique optical properties.
  • Local dielectric environment significantly influences nanoparticle plasmon resonance.
  • Understanding spatial sensitivity is crucial for advanced sensing applications.

Purpose of the Study:

  • To investigate the local sensitivity of optically excited plasmonic nanoparticles.
  • To correlate spectral shifts with changes in the local dielectric environment.
  • To determine optimal probing strategies for plasmonic sensing.

Main Methods:

  • Utilized a scanning glass fiber tip to perturb the local dielectric environment of a plasmonic nanoparticle.
  • Recorded particle plasmon scattering spectra at various tip positions.
  • Analyzed spectral resonance shifts, scattering intensity, and plasmon damping.

Main Results:

  • Observed spectral resonance shifts and changes in scattering intensity and plasmon damping.
  • Found strongest spectral shift sensitivity at the nanoparticle edges, aligning with plasmonic field profiles.
  • Identified the nanoparticle center as the most sensitive region for scattering intensity probing at the short-wavelength slope.

Conclusions:

  • Local dielectric environment strongly dictates plasmonic nanoparticle response.
  • Sensitivity mapping reveals distinct spatial dependencies for spectral shifts versus scattering intensity.
  • Findings offer critical insights for optimizing single-wavelength plasmonic sensing techniques.