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Localized surface curvature artifacts in tip-enhanced nanospectroscopy imaging.

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Tip-enhanced Raman spectroscopy (TERS) imaging can be affected by artifacts. This study analyzes tip-sample coupling effects and substrate curvature in gap-mode TERS for more reliable nanoscale chemical analysis.

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Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Tip-enhanced Raman spectroscopy (TERS) offers nanoscale chemical analysis beyond the diffraction limit.
  • Gap-mode TERS enhances sensitivity using metallic substrates.
  • Tip-sample coupling can introduce imaging artifacts in TERS.

Purpose of the Study:

  • To provide a generalized view of imaging artifacts in TERS and near-field imaging.
  • To investigate the role of tip-sample coupling and substrate geometry in gap-mode TERS.
  • To understand the impact of nanoscale curvature on TERS imaging.

Main Methods:

  • Experimental investigation of various substrates.
  • Numerical simulations to complement experimental data.
  • Analogy drawn with atomic force microscopy artifacts.

Main Results:

  • Tip convolution effects can broaden observed dimensions in 3D nanostructures due to sample curvature.
  • Substrate curvature significantly impacts gap-mode TERS imaging, contrary to idealized flat substrate models.
  • Geometrical effects of substrates were evidenced, clarifying their role in TERS.

Conclusions:

  • This work offers a comprehensive analysis of artifacts in gap-mode TERS imaging.
  • Understanding tip- and substrate-related artifacts is crucial for reliable near-field optical nanospectroscopy.
  • The study enhances the understanding and reliability of nanoscale chemical analysis using TERS.