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Related Experiment Video

Updated: Dec 28, 2025

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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A Closer Look at Corrugated Au Tips.

Ashish Bhattarai1, Kevin T Crampton1, Alan G Joly1

  • 1Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States.

The Journal of Physical Chemistry Letters
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Summary

Corrugated metallic tips exhibit complex plasmonic behaviors. Nanoscale features on these tips significantly influence tip-enhanced Raman spectroscopy (TERS) signals, revealing unexpected optical phenomena.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Spectroscopy

Background:

  • Metallic tips are crucial for plasmonic field enhancement.
  • Tip structure dictates optical resonances and plasmonic fields.
  • Nanoscale details influence tip-enhanced Raman (TER) spectra.

Purpose of the Study:

  • To investigate the properties of corrugated metallic tips using optical and electron microscopies.
  • To understand how tip morphology affects plasmonic resonances and TER spectra.
  • To analyze molecular behavior under tip-tip TER geometry.

Main Methods:

  • Combined optical and electron microscopy techniques.
  • Tip-enhanced Raman nanospectroscopy (TERS) with 4-thiobenzonitrile (TBN) as a molecular reporter.
  • Analysis of spatially resolved TER spectra.

Main Results:

  • Tip shape determines optical resonances and plasmonic enhancement.
  • Nanometric details govern TER spectra and images.
  • Optical rectification and molecular charging observed in tip-tip TER geometry.
  • Surface corrugation causes localized resonances, complicating spectral assignments.
  • Tip-tip geometry sustains unique junction plasmons.

Conclusions:

  • Nanoscale corrugations on metallic tips introduce complex plasmonic effects.
  • TERS is sensitive to structural details, enabling the study of optical rectification and molecular charging.
  • Understanding these nanoscale phenomena is crucial for accurate spectral interpretation in TERS.